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WWDC 2020会话说明

谢谢？

去年，WWDC会议说明非常成功，以至于我决定继续这种形式的WWDC会话摘要。我想花点时间感谢大家的贡献，反馈，支持和阅读我的会议笔记

简介

通常，阅读某些弹力要点而不是观看50分钟的会话视频要快得多。然后，如果您发现一些有趣的东西，您仍然可以观看它。

使用★强调了异常提及的会话。

这是在进行中的工作，因为我自己观看所有视频都是付出了很多努力。因此，要么要耐心等待，要么就打开一个问题，以提出建议您想看的会话笔记：:)

贡献

如果我弄错了问题，或者您有改进的建议，请随时提交公关。如果您想贡献，也请查看贡献。md。

非常感谢所有贡献并提高了笔记的总体质量以及在列表中添加完整笔记的人。

提及

该仓库已经在Twitter上多次提及，除此之外，在以下位置：

iOS开发周刊第409号
iOS糖果问题287
Swift Developments问题189
wwdcnotes

有趣的与WWDC相关的链接

@Apple的Apple开发人员文档
XCode发行说明
iOS和iPados发行说明

（待办事项）使用App Store Connect API扩展自动化
（待办事项）评估的新功能
引入汽车钥匙
（待办事项）优化视频应用程序的核心图像管道
（待办事项）编辑并播放带有Avfoundation的HDR视频
（待办事项）在您的应用中导出HDR媒体，并具有AvFoundation
（待办事项）作者与avassetwriter碎片的mpeg-4内容
（待办事项）用金属发现射线跟踪
（待办事项）了解金属功能指针
（待办事项）核心数据：杂物和格言
（待办事项）开关控制的应用程序可访问性
（待办事项）使您的应用在视觉上访问
（待办事项）用Xcode构建基于金属的核心图像内核
（待办事项）在您的应用程序中创建无缝的语音体验
uicollectionView中的列表
现代细胞配置
认识widgetkit
（待办事项）在Swiftui中的堆栈，网格和轮廓
（待办事项）为小部件构建Swiftui视图
（待办事项）小部件代码，第1部分：冒险开始
（待办事项）小部件代码，第2部分：替代时间表
（待办事项）小部件代码，第3部分：推进时间表
（待办事项） Swiftui中的应用要素
（待办事项）在Swiftui中构建基于文档的应用程序
Swiftui中的数据必需品
Swiftui的新功能
（待办事项）为TVOS构建Swiftui应用程序
（待办事项）用创建ML构建一个动作分类器
（待办事项）可扩展数据源的进步
（待办事项）为Apple Watch创建并发症
（待办事项）启用加密的DNS
（待办事项）在Swiftui中建立并发症
（待办事项）使您的并发症保持最新状态
与iOS采摘机，菜单和动作一起建造
（待办事项）优化MAC Catalyst应用的界面
（待办事项）用功率和性能API确定趋势
（待办事项）设计高质量的Siri媒体互动
（待办事项）将您的Sirikit媒体意见扩展到更多平台
（待办事项）背景执行神秘
（待办事项） Sirikit和快捷方式的新功能
（待办事项）评估和优化应用程序的语音交互
（待办事项）赋予您的意图
（待办事项）破译并处理常见的Siri错误
（待办事项） Xcode组织者诊断性能问题
用xctest消除动画链
为什么我的应用被杀死？
（待办事项）
（待办事项）将您的应用程序与WAND集成
（待办事项）在快捷方式应用程序中介绍您的动作
智力设计：应用程序进化
（待办事项）智力设计：与“系统”结交朋友
智力设计：发现新机会
（待办事项）发现核心图像调试技术
（待办事项）用avfoundation和videotoolbox解码prores
（待办事项）写测试以失败
（待办事项）为iPados指针构建
（待办事项）处理触控板和鼠标输入
（待办事项）推送通知底漆
（待办事项）探索XCode Playgrounds的软件包和项目
UicollectionView的进步
通用链接中的新功能
（待办事项）探索动作与愿景应用程序
主题演讲★
（待办事项）见表面分享
（待办事项）设计出色的小部件
（待办事项）采用MacOS的新外观
（待办事项）为iPad构建
（待办事项）见iPad的涂鸦
（待办事项）铅笔kit的新功能
（待办事项）支持应用程序中的硬件键盘
（待办事项）支持您应用中的本地网络隐私
（待办事项）通过现代网络提高性能和安全性
（待办事项）建立限制网络的本地推送连接
（待办事项） iPad和Apple Silicon Mac上的iPhone应用程序
（待办事项）到处都是汽车
（待办事项）用自定义转子的配音效率
（待办事项） MAC催化剂的可访问性设计
（待办事项）为其他业务创建应用程序剪辑
（待办事项） Swiftui简介
简化您的应用程序剪辑
（待办事项） Discove for IT和托管软件更新
（待办事项）利用企业身份和身份验证
（待办事项）构建位置感知企业应用
（待办事项）构建可扩展企业应用套件
（待办事项） MAC Catalyst中的新功能
（待办事项）游戏中心的设计
配置并链接您的应用程序剪辑
将二进制框架作为快速软件包分发
（待办事项）检查，修改和构造铅笔套图
（待办事项）为SwiftUi预览构建您的应用程序
（待办事项） Carekit的新功能
（待办事项）使用核心ML使用模型部署和安全性
（待办事项）使用Core ML转换器在设备上获取模型
（待办事项）与Swift创建ML的控制培训
（待办事项）提供更好的HLS音频体验
（待办事项）构建端点安全应用程序
（待办事项）格式化：使数据对人类友好
位置隐私设计
（待办事项）在Objective-C运行时的进步
XCTSKIP您的测试
拥抱Swift类型推理
（待办事项）安全地管理指针
（待办事项）探索在Swift中登录
（待办事项） Swift软件包：资源和本地化
Swift的新功能
（待办事项） WatchOS设计中的新功能
（待办事项）设计出色的应用程序剪辑
（待办事项）
探索应用程序剪辑
（待办事项） UI排版的细节
（待办事项） TVOS图片中的主图
Healthkit的新功能
（待办事项）将健康数据与HealthKit同步
（待办事项）视觉上编辑Swiftui视图
（待办事项） Discover Wkwebview增强功能
（待办事项）确保您的应用程序：威胁建模和反模式
（待办事项）与WatchOS上的快捷方式创建快速互动
（待办事项）将配置和智能添加到小部件
（待办事项）通过Siri事件建议扩大您的影响力
平台国联盟★
（待办事项）智力设计：结识他们所在的人
（待办事项）创建出色的企业应用程序：与Box的Aaron Levie聊天
（待办事项）与iOS采摘器，菜单和动作一起设计
（待办事项） iPad的设计
（待办事） SF符号2
（待办事项）核心NFC中的新功能
（待办事项）与DriverKit现代化PCI和SCSI驱动程序
（待办事项）将Mac应用程序移植到Apple Silicon
（待办事项） ResearchKit中的新功能
（待办事项）在Swift中探索数值计算
（待办事项）使用Xcode构建对本地化友好的布局
（待办事项）处理UI测试中的中断和警报
更快地获得测试结果
（待办事项）为员工创建自定义应用程序
（待办事项）使用零触摸部署Apple设备
（待办事项）满足音频工作组
（待办事项）通过HLS工具改善流创作
（待办事项）与AvauioSession记录立体声音频
低延迟HLS中有什么新功能
（待办事项）发现HLS阻塞预紧提示
（待办事项）使用HLS播放列表三角洲更新优化实时流
（待办事项）减少HLS阻止播放列表重新加载的延迟
（待办事项）将广告插入适应低延迟HLS
（待办事项）艺术家的AR工具包
（待办事项）用金属线束苹果GPU
（待办事项）用GPU计数器优化金属应用程序和游戏
（待办事项）与AR快速外观在线购物
（待办事项）用Xcode 12获得对金属应用的见解
探索Arkit 4
（待办事项） Reality Kit中的新功能
（待办事项） USD的新功能
（待办事项）游戏控制器的进步
（待办事项）用金属构建GPU二进制
（待办事项）金属的调试GPU侧错误
（待办事项）将键盘和鼠标游戏带到iPad
（待办事项）点击游戏中心：仪表板，访问点和个人资料
（待办事项）点击游戏中心：排行榜，成就和多人游戏
（待办事项）支持性能密集型应用程序和游戏
（待办事项）将您的金属应用程序带到苹果硅Macs
（待办事项）优化苹果硅Mac的金属性能
（待办事项）用replayKit捕获和流式传输应用程序
（待办事项）发现Apple TV的搜索建议
加速您的应用程序
（待办事项） Apple Watch流式传输音频的新功能
（待办事项）管理Apple设备的新功能
（待办事项） iPados指针的设计
（待办事项）处理应用程序中有限的照片库
（待办事项）在创建ML中构建图像和视频样式传输模型
（待办事项）
（待办事项）使用Xcode上的AWS lambda上使用Swift
（待办事项）在您的TVOS应用中支持多个用户
（待办事项） Web检查员中有什么新功能
（待办事项）成为模拟器专家
（待办事项）不安全的迅速
（待办事项）将自定义视图和修饰符添加到Xcode库
（待办事项）将核心数据存储与CloudKit公共数据库同步
App Store Connect中有什么新功能
认识新照片选择器
（待办事项）检测身体和姿势
（待办事项）为iPad和Mac创建Swift Playgrounds内容
（待办事项）发现如何下载和播放HLS离线
（待办事项）超越计数步骤
（待办事项）用自然语言使应用程序更聪明
（待办事项）
（待办事项）在Xcode中引入Storekit测试
（待办事项）位置的新功能
（待办事项）应用程序内购买的新功能
钱包和苹果工资的新功能
（待办事项） Web开发人员的新功能
（待办事项）开始使用HealthKit
（待办事项）满足Safari Web扩展
（待办事项）一tap帐户安全升级
（待办事项）与Apple Business Manager的自定义应用程序分销
（待办事项）见附近的互动
（待办事项）处理FHIR而不会被烧毁
（待办事项）符合脸部ID并触摸网络ID
（待办事项）用于订阅的架构
（待办事项） Classkit中的新功能
（待办事项）探索计算机视觉API
（待办事项）通过更好的隐私建立信任
（待办事项）使用金属性能着色器图构建自定义的ML模型
（待办事项）精炼appocend-c框架
（待办事项）探索Apple Silicon Mac的新系统体系结构
（待办事项）与xctissue的分类测试失败

使用App Store Connect API扩展自动化

https://developer.apple.com/wwdc20/10004

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

评估的新功能

https://developer.apple.com/wwdc20/10005

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

引入汽车钥匙

https://developer.apple.com/wwdc20/10006

主持人： Matthias Lerch

人们可以解锁，锁定和启动汽车（iPhone或Apple Watch）
牢固地存储在设备上，可以通过iCloud删除
钥匙可以与家人或朋友共享
无线电技术不可知（到目前为止支持NFC ）
离线有能力
汽车需要支持：
- 所有者配对（如果iPhone和汽车，关联）
  - 证明汽车的所有权
  - 启动配对
  - 将iPhone放在汽车的NFC阅读器附近
  - 汽车钥匙出现在钱包中
- 交易（解锁，锁，启动汽车）
  - NFC读取器在门把手和仪表板上（发动机启动）
  - 针对安全性和性能进行了优化
  - Express Mode允许功能无面部ID或密码工作（默认打开）
  - iPhone和汽车可以离线
  - 苹果不知道你什么时候使用汽车
- 服务器接口（密钥共享，密钥管理）
  - 通过消息共享钥匙
  - 共享时汽车可能会离线
  - 苹果不知道您与谁共享您的汽车钥匙
  - 可选访问级别（例如“解锁和驱动器”，“访问和驱动到65英里 /小时”）
  - 这取决于每个汽车制造商来定义访问级别
密钥管理
- 管理iPhone或Car的所有者和共享钥匙
- 从设备停止工作的键立即工作（即使设备离线）
- 易于更改所有者设备（例如购买新iPhone时）
系统体系结构
- 完全整合到本地iOS中
- 键创建并存储在安全元素中，从不导出
- 所有功能都使用AES和Eliptic-Curve密码学
- 基于PKI的离线设计
- 简单服务器集成不需要汽车制造商TSM（受信任的服务管理器）
- 什么是数字汽车钥匙？
  - 借给用户的设备，而不是苹果或汽车制造商
  - 私钥（SK）永远不会离开SE（安全元素）
  - 公共密钥在X.509证书中导出
  - 小程序
    - 在安全元件中实现汽车钥匙
    - 存储密钥对，汽车公钥，安全邮箱
    - 所有在单个小程序实例中托管的汽车键
  - 所有者配对流（在线）
    1. Pake验证者
    2. 配对密码
    3. 配对
    4. 加密链接
    5. 密钥激活/注册
    6. 关键证明
  - 密钥共享流
    1. 所有者使用消息发送邀请
    2. 新的钥匙在
    3. 身份证书链
    4. 所有者验证
    5. 证明返回
    6. 离线注册
  - 汽车钥匙的生命周期
    - 在所有者配对或密钥共享期间创建
    - 交易
    - 悬架
    - 吊销
    - 删除
  - 证书和交易
    - 所有者共享，密钥共享，快速和标准交易
    - 在11:30更深入地了解所呈现的流程和计划
无线电技术
- NFC
  - 基于标准的NFC阅读器
  - 增强的非接触式协议（ECP）
  - 启用全自动NFC体验
  - 交易开始之前可用的标识符（读者类型，汽车制造商）
  - 有效的读者投票
- 超宽带
  - 带U1芯片的iPhone
  - 与iPhone一起在袋子或口袋中使用
  - 通用密钥管理体系结构
  - 目前正在开发规范
服务器集成
- 远程密钥管理所需
- Auto Maker Server需要建立与Apple后端的连接（对于每个环境，例如测试和生产）
- 交换证书
- 实现和测试服务器接口（注册新密钥，撤销密钥，发送通知）
- 提供艺术品
- 连接到汽车制造商应用程序
汽车制造商应用程序
- 使用存储在钱包中的键提供自定义功能
- 开始所有者配对
- 可用于汽车制造商
- 需要权利
- 使用Passkit API
如何入门（对于汽车制造商）
- 汽车连通联盟
- 数字密钥规范2.0
- 数字密钥规范3.0（在开发中，将支持超宽带）
- carconnectivity.org
- Apple MFI程序的Entroll

优化视频应用程序的核心图像管道

https://developer.apple.com/wwdc20/10008

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

编辑和播放使用Avfoundation的HDR视频

https://developer.apple.com/wwdc20/10009

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

带有Avoundation的应用中的HDR媒体导出HDR媒体

https://developer.apple.com/wwdc20/10010

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

作者与AvassetWriter的碎片MPEG-4内容

https://developer.apple.com/wwdc20/10011

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

发现射线用金属跟踪

https://developer.apple.com/wwdc20/10012

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

了解金属功能指针

https://developer.apple.com/wwdc20/10013

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

核心数据：杂物和格言

https://developer.apple.com/wwdc20/10017

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

开关控制的应用程序可访问性

https://developer.apple.com/wwdc20/10019

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

使您的应用在视觉上访问

https://developer.apple.com/wwdc20/10020

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

用Xcode构建基于金属的核心图像内核

https://developer.apple.com/wwdc20/10021

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

在您的应用程序中创建无缝的语音体验

https://developer.apple.com/wwdc20/10022

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

uicollectionView中的列表

https://developer.apple.com/wwdc20/10026

主持人：迈克尔·奥奇（Michael Ochs）

iOS中的列表14个收集视图显示UITableView - 类似于UICollectionView中的外观
改进的自我规模支持：现在使用UICollectionView中的列表时默认
- 用自动划分构建单元格，让收集视图接管
- Override preferredLayoutAttributesFittingAttributes:在细胞子类上进行手册大小
UICollectionLayoutListConfiguration
- 布局侧唯一需要在集合视图中构建列表的新类型
- 建立在NSCollectionLayoutSection和UICollectionViewCompositionalLayout上：查看收集的进步查看布局
- 添加了两种列表专有风格： .sidebar和.sidebarPlain用于在iPados上构建多列应用程序14
- 显示/隐藏分离器和配置列表标头/页脚的选项
创建列表
- 简单的方法
  1. 创建一个UICollectionLayoutListConfiguration
  2. 使用配置创建一个UICollectionViewCompositionalLayout
- 每节设置
  1. 创建一个UICollectionLayoutListConfiguration
  2. 使用配置创建NSCollectionLayoutSection
  3. 将上述代码放入现有部分提供商初始化器中的组成布局
  4. 根据每节自定义布局
配置列表部分标题/页脚
- 必须明确启用标题/页脚
  - 注册标题/页脚作为补充观点
    - 将标题/页脚配置模式设置为“补充”
    - 在屏幕上呈现标头/页脚时提供补充视图
  - 将headerMode为firstItemInSection （仅标题）
    - 配置第一个集合视图单元格看起来像标头
    - 建议用于层次数据结构和快照API：查看可扩展数据源的进步
    - 数据源需要意识到第一个单元格是标题
UICollectionViewListCell
- UICollectionViewCell的子类可互换使用
- 更好地支持配置分离器插图和手机内容凹痕
- 功能滑动动作
- 更好的配件API
- 授予访问默认系统内容/背景配置：查看现代单元格配置
分离器布局指南
- 分离器应该与主要单元格内容对齐
- 将此布局指南限制为内容：Uikit布局指南的对面
  1. 配置单元格的布局
  2. 将“分离器布局指南的领先锚”限制为Cell的主要内容的领先锚
- 使用系统提供的内容配置时会自动处理
滑动动作
- 仅在使用列表配置配置的单元内渲染单元格时才支持
- 覆盖领先/尾随的滑动操作的配置getter要配置
- 注意：切勿捕获在操作处理程序中配置的单元格的索引路径（不稳定）
  - 直接捕获数据模型
  - 捕获细胞的稳定标识符：
    - 扩展数据源及其稳定项目标识符
    - iOS 14中的新单元格注册类型：uicollectionviewListCell
列表单元格的配件API
- 配置单元格和后侧的选项
- 在同一侧配置多个配件
- 列表单元格配件上的功能
  - 重新订购附件：窃听时，单元将自动处于重新训练模式
  - 删除附件：单元将自动揭示敲击时配置的落后滑动操作
  - 轮廓披露配件
    - 细胞自动与数据源通信，并在窃听时扩展/崩溃
    - 需要新的部分快照API：查看可扩展数据源的进步
在保留自定义功能的同时，提供了大量的系统默认

现代细胞配置

https://developer.apple.com/wwdc20/10027

主持人：泰勒狐狸

开始配置
- 在iOS 13中，我们使用UITableViewCell上的内置imageView和TextLabel属性来显示图像和一些文本。
- 在iOS 14中，我们使用内容配置来描述特定状态的单元格外观
- 这就是您使用内容配置配置单元格的方式：
  - var content = cell.defaultContentConfiguration()这总是返回新的配置，而没有设置任何内容。根本不需要考虑旧状态。
  - 在内容配置上设置图像和文本。
  - cell.contentConfiguration = content ，一旦我们称之为content，该单元格会更新以显示我们指定的图像和文本。
- 相同的代码以配置任何单元格和任何支持内容配置的视图。
- 可综合，轻巧，非常便宜，可为性能创建和建造
配置类型
- 背景配置
  - 让您设置诸如背景颜色，视觉效果，中风，插图，角落半径和自定义视图之类的东西
- 列出内容配置
  - 让您设置诸如图像，文本，次要文本，布局指标和行为之类的内容
配置状态
- 配置状态表示您用于配置单元格和视图的各种输入。
- 每个单元格，标头和页脚都有自己的配置状态。
- 两种类型
  - 查看配置状态
    - 特质收集
    - 4个州：突出显示，选择，残疾和专注
    - 自定义状态：这是键值存储，可添加用于配置视图的任何额外状态或数据。
  - 单元格配置状态
    - 所有内容从视图配置状态
    - 编辑，刷新，扩展
    - 拖放状态
- 当automaticallyUpdatesContentConfiguration为True时，该单元将自动调用updated(for:)当单元格的配置state更改时，在其contentConfiguration上更新，并将更新的配置应用回单元格。默认值是正确的。
- 当automaticallyUpdatesBackgroundConfiguration为True时，该单元将自动调用updated(for:)在单元格的配置state更改时，在其后台configuration上更新，并将更新的配置应用回单元格。默认值是正确的。
- 您可以覆盖updateConfiguration(using:)来手动更新和自定义内容配置，通过将此属性设置为False禁用自动更新。此方法在您的单元格第一次显示之前被调用，并将在配置状态更改时被调用。

认识widgetkit

https://developer.apple.com/wwdc20/10028

主持人：纳希尔·汗（Nahir Khan），尼尔·德赛（Neil Desai）

现在在所有平台上使用小部件
伟大的小部件是可听的，相关和个性化的
智能堆栈是小部件的集合，并使用装置智能自动显示正确的堆栈
小部件通过敲击配置支持配置- 这是使用类似于Sirikit的意图实现的
例如，在天气应用中选择城市
UI完全在Swiftui中建造
韦德吉特的工作原理
- WidgetKit扩展是背景扩展
- 他们返回一系列时间表的视图层次结构
- 时间线发送到主屏幕，该屏幕在正确的时间显示正确的视图
- 由于视图已“准备就绪”
- 时间表从主应用程序刷新，并按扩展计划进行更新
  - 想象一下当天的日历时间线。一个事件是从日历中更新的，然后唤醒扩展名并提供新的时间表。
建造一个小部件
- 单小部件扩展名支持不同平台上的多种小部件
- 可能的配置： Static （锻炼小部件）或Intent-Based （可以个性化的提醒小部件）
- 受支持的家庭：小部件可以启用以下一个或许多家庭： systemSmall ， systemMedium ， systemLarge
- 小部件结构必须符合Widget及其身体，以WidgetConfiguration
- 如何建立可透彻的体验
  - 小部件不是迷你应用程序，他们宁愿在主屏幕上项目内容
  - 没有滚动
  - 没有视频或动画图像
  - 将交互作用以深度链接到主要应用程序。使用widgeturl api与URL链接相关联的小部件（使用Swiftui的新链接API）
  - 重要的新视图类型：
    - Placeholder
      - 不应包含用户数据
      - 出色的占位符UI表示您的数据是什么样的代表
    - Snapshot
      - 代表单个条目
      - 应该尽快返回视图
      - 用于在画廊中显示您的小部件
      - 将其用作时间表中的第一个条目，以便用户在画廊中看到他们看到的东西
    - Time line
      - 观点和日期的结合
      - 输出如果将WidgetKit扩展程序序列化为磁盘，该磁盘启用了单个条目的渲染
  - 重新加载
    - 唤醒扩展名并要求新的时间表
    - 帮助确保内容是最新的
- 通过结构提供商获取TimelineProvider struct Provider: TimelineProvider
  - 实施func snapshot(...)和func timeline(...)以返回相应的数据
  - 在时间行时提供重新加载政策，以确定应何时重新加载时间线： atEnd ， after(date: Date) ， never
- 系统确定重新加载小部件的最佳时间，例如：
  - 背景通知
  - 大幅度变化
  - 用户进行的应用程序更改，例如新日历条目
- 使用WidgetCenter.[reloadTimelines(ofKind:), reloadAllTimelined]
- 使用WidgetCenter.getCurrentConfigurations(completion:)
  - 使用批处理请求
  - 不要从小部件过度使用网络
- 使用onBackgroundURLSessionEvents修饰符启动网络任务，该任务可将结果传递给您的扩展
  - 重新加载是由系统预算的，不要过度使用它们
- 个性化
  - 使用Siri已知的Intents框架来自定义小部件行为
  - 使用新的应用内意图处理来回答小部件的请求
  - IntentConfiguration用于为基于意图的小部件配置提供动力
  - IntentTimelineProvider用于生成特定的时间线
- 智力
  - 小部件通过设备智能显示在主屏幕上
  - 您的应用程序可以捐赠快捷方式
  - 小部件扩展可以使用TimelineEntryRelevance分数和持续时间属性来注释时间线条目

Swiftui中的堆栈，网格和轮廓

https://developer.apple.com/wwdc20/10031

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

为小部件构建Swiftui视图

https://developer.apple.com/wwdc20/10033

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

小部件代码，第1部分：冒险开始

https://developer.apple.com/wwdc20/10034

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

小部件代码，第2部分：替代时间表

https://developer.apple.com/wwdc20/10035

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

小部件代码，第3部分：前进时间表

https://developer.apple.com/wwdc20/10036

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

Swiftui的应用必需品

https://developer.apple.com/wwdc20/10037

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

在Swiftui中构建基于文档的应用程序

https://developer.apple.com/wwdc20/10039

主持人：榜样，另一个人

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

Swiftui中的数据必需品

https://developer.apple.com/wwdc20/10040

主持人： Curt Clifton，Luca Bernardi，Raj Ramamurthy

入门
- 始终问您以下问题：
  - 我的观点需要什么数据？
  - 视图将如何操纵这个日期？
  - 数据将来自哪里？
- 不变的视图（仅显示数据）仅包含让属性
- 在自己的配置对象中拉出多个属性
  - 配置对象可以包含函数以突变其状态
  - 使用@State private var config: ConfigObject()来重新渲染您的视图，之后config后
  - 让父和sub视图通过使用@Binding var config通过单个配置对象进行通信
  - 通过将IT标记为参考使用美元符号： SubView(config: $config)通过标记为参考来传递config
使用可观察的对象进行建模数据
- 班级受限协议（仅通过参考类型采用）
- 可用于实现超级定制行为，例如通过服务或服务器备份数据
- 通过实现var objectWillChange: Self.ObjectWillChangePublisher { get }
- 用于管理数据生命周期，处理副作用，与现有组件集成
- 将是您的真理之源
- 不需要是您的完整数据模型 - 如果您的模型复杂，则分为多个可观察的对象
- 如果您的数据模型很简单，请对所有视图使用单个可观察的对象
- 您的观察值的标记属性，您的视图对@Published var progress: Double
- 如何创建可观察的对象依赖性？
  - @ObservedObject
    - @ObservedObject var config: Configuration
    - 您需要在视图之外管理对象所有权
    - 创建与可观察视图的任何值属性的绑定，以将其传递到$config.isFinished Toggle 。
  - @StateObject
    - Swiftui拥有可观察的对象
    - 创造/破坏与查看的生命周期有关
    - 在身体运行之前实例化
    - 使用它来实现一个ImageLoader: ObservableObject带有@published var image: Image属性
    - 每当@StateObject更改时，视图都会重新渲染，因此填充了图像
  - EnvironmentObject
    - 在Swiftui中，您通常具有许多模块化子视图的层次结构
    - 为了避免大量的样板，通过观察对象将其传递给.environmentObject(...)
    - 从层次结构中的任何视图中，对其进行更改都将在任何其他视图中反映
SwiftUI性能考虑
- 避免使用缓慢的查看更新
  - 使查看初始化器便宜，例如无派遣
  - 使身体成为纯粹的功能
  - 避免假设
- 新事件来源： onChange ， onOpenURL ， onContinueUserActivity在主线程上运行
谁拥有数据？
- 共同祖先共享数据
- 利用@StateObject
- 考虑将全局数据放入App中，并将其传递到视图层次结构。更改它将重新渲染应用程序的所有场景（实例/窗口）
- 新2020年：在应用程序重新启动之间提供数据持久性的房地产包装器，可以用作真理的来源
  - @SceneStorage
    - 由Swiftui管理的用于阅读/写作数据的人均属性包装器
    - 视图数据的轻量级存储
    - 用它来填充您的收集视图
  - @AppStorage
    - 使用UserDefaults ，在任何地方可用（应用/视图）
    - 非常适合存储设置
    - @AppStorage("amountOfGold") private var amountOfGold = 5000
    - 每当属性更改时，都会自动读取/写入/到UserDefaults

Swiftui的新功能

https://developer.apple.com/wwdc20/10041

主持人：马特·里克森（Matt Ricketson），泰勒·凯利（Taylor Kelly）

应用
- 使用Swiftui键化整个应用程序： struct BookClubApp: App
- 应用可以声明数据依赖性
- 使用WindowGroup独立管理Windows平台。支持MacOS和iPados上的多个Windows。
- 使用Settings免费获取优先窗格•MacOS上可用
- 使用DocumentGroup场景类型自动处理打开，保存和编辑文档•MACOS，iOS，iPados
- 使用CommandMenu命令将其他菜单添加到菜单栏中，包括键盘快捷键
- 专门针对Swiftui应用的新的多平台模板
- LaunchScreen info.plist键配置启动屏幕•故事板的简单替代方案
小部件
- iOS，iPados，MacOS专门使用Swiftui构建
- 由struct YourWidget: Widget和var body: some WidgetConfiguration
- 使用Swiftui为WatchOS构建自定义并发症
列表和收藏
- 列表现在接收大纲以快速访问列表内容•减少对推/弹出导航模式的需求
- Lazy loading grid layouts ( Lazy[V|H]Stack ) to reduce memory footprint and preserve smooth scrolling for large amounts of data
- View Builder for switch statements to show eg different image styles in a list of images
Toolbars and Controls
- .toolbar modifier for unified display of toolbars
- Use ToolbarItem(placement: .principal) to make an item prominent
- Use ToolbarItem(placement: .bottomBar) to place an item in the bottom bar
- When using Label("Title", systemImage: "sf.symbol.name") SwiftUI automatically display icon and/or text depending on where the label is displayed: toolbar, list, ...
- .keyboardShortcut modifier can now be used for additional controls like Button
- New default focus support in tvOS
- New controls:
  - ProgressView("Downloading", value: progress) - horizontal bar
  - ProgressView("Downloading", value: progress).progressViewStyle(CircularViewStyle()) - circular progress indicator
  - ProgressView() - spinner
  - Gauge to indicate the level of value • can contain value labels and min/max value labels
New effects and styling
- New control center UI with beautiful transitions
- .matchedGeometryEffect to provide smooth animations inside of a grid of UI elements
- .clipShape(ContainerRelativeShape()) to automatically apply a super views shape to the subview
- custom fonts automatically scaled with dynamic type changes
- Custom accent color directly form the AssetCatalog on all platforms
- Many controls can now be tinted
System integration
- New Link control to display URLs in link style and open them with the default browser • also supports url schemes to open other apps
- @Environment(.openURL) private var openURL to programmatically open urls via openURL(url) in your views
- onDrag {} and onDrop {} to support drag & drop
- UniformTypeIdentifers framework for eg introspection of file types
- Sign in with Apple as first class component in SwiftUI • available on every platform
- Other Frameworks: AuthenticationServices , AVKit , MapKit , SceneKit , SpriteKit

Build SwiftUI apps for tvOS

https://developer.apple.com/wwdc20/10042

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build an Action Classifier with Create ML

https://developer.apple.com/wwdc20/10043

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Advances in diffable data sources

https://developer.apple.com/wwdc20/10045

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Create complications for Apple Watch

https://developer.apple.com/wwdc20/10046

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Enable encrypted DNS

https://developer.apple.com/wwdc20/10047

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build complications in SwiftUI

https://developer.apple.com/wwdc20/10048

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Keep your complications up to date

https://developer.apple.com/wwdc20/10049

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build with iOS pickers, menus and actions

https://developer.apple.com/wwdc20/10052

Presenters: Eric Dudiac, David Duncan

UISlider and UIProgressView: More consistent across platforms now
UIActivityIndicatorView: New simpler design, Use color API and modern styles, Updates "pull-to-refresh"
UIPickerView: Updated styling
UIPageControl
- New interactions (scrubbing, scrolling)
- Unlimited pages
- Optional custom indicator icons: .preferredIndicatorImage(UIImage()) to set all or .setIndicatorImage(UIImage(), forPage: 0) for a specific image
- Multiple styles: .backgroundStyle = .prominent to highlight the background
UIColorPickerViewController
- New view controller for picking colors
- Eyedropper, Favorites, Hex specification
UIDatePicker
- New compact style to select date and time
- In-line style on iOS - great for iPad or if date picking is primary UI (matches modal presentation)
- Useful when you have space constraints
- Full modal calendar when selecting dates
- Keyboard for selecting times
- New macOS style (10.15.4)
  - Compact, modal calendar presentation
  - Supported in Catalyst apps
菜单
- Provided on UIControl
- Directly supported by UIButton and UIBarButtonItem by button.menu = UIMenu(...)
- Triggered via long-press by default
- Show the menu by a simple tap by setting button.showsMenuAsPrimaryAction = true and don't provide a primary action
- Back buttons implement menus to quickly jump back in navigation stack
- Take action when the menu action is recognized, register for UIControl.Event.menuActionTriggered
- UIDeferredMenuElement to async provide menu items
- UIContextMenuInteraction to modify or replace provided menu updateVisibleMenu(_ block menu: (UIMenu) -> UIMenu)
  - Use UIContextMenuInteraction.rich to display previews and .compact to only show a menu
- New UIBarButtonItem initializers init(systemItem:primaryAction:menu:) , init(title:image:primaryAction:menu:)
- New UIBarButtonItem .fixedSpace() and .flexibleSpace
- UIButton can finally be initialized using an UIAction : init(type:primaryAction:) -> native block based API
- UISegmentedControls can now finally be initialized using UIActions -> native block based API

Optimize the interface of your Mac Catalyst app

https://developer.apple.com/wwdc20/10056

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Identify trends with the Power and Performance API

https://developer.apple.com/wwdc20/10057

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design high quality Siri media interactions

https://developer.apple.com/wwdc20/10060

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Expand your SiriKit Media Intents to more platforms

https://developer.apple.com/wwdc20/10061

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Background execution demystified

https://developer.apple.com/wwdc20/10063

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in SiriKit and Shortcuts

https://developer.apple.com/wwdc20/10068

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Evaluate and optimize voice interaction for your app

https://developer.apple.com/wwdc20/10071

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Empower your intents

https://developer.apple.com/wwdc20/10073

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Decipher and deal with common Siri errors

https://developer.apple.com/wwdc20/10074

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Diagnose performance issues with the Xcode Organizer

https://developer.apple.com/wwdc20/10076

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Eliminate animation hitches with XCTest

https://developer.apple.com/wwdc20/10077

Presenter: Tanuja Mohan

Hitch: A frame appears on screen later than expected
VSYNC: Time the screen swaps the frame onto the display
Hitch time: Time in ms that a frame is late to display
Hitch ratio: Hitch time in ms per second for a given duration
Apple doesn't use frames per second (fps) since:
- 60 or 120 fps is not always the desired target
- Display may intentionally not be updated
- Target frame rate may intentionally be lower than possible
Hitch ratio is always comparable across tests, following ratios are recommended:
- Good: < 5ms/s
- Warning: 5..10ms/s - users will start recognizing hitches
- Critical: >10ms/s
Can be measured using XCTestMetrics and unit tests or for production apps using MetricsKit and Xcode Organizer
XCTOSSignpostMetric gives you the following when using an animation os_signpost interval:
- 期间
- Total count of hitches
- Total duration of hitches
- Hitch time ratio
- 帧速率
- 框架计数
Specify an animation os_signpost interval by:
- os_signpost(.animationBegin, log: logHandle, name: "performanceAnimationInterval")
- os_signpost(.end, log: logHandle, name: "performanceAnimationInterval")
UIKit has pre-defined metrics:
- XCTOSSignpostMetric.navigationTransitionMetric
- XCTOSSignpostMetric.customNavigationTransitionMetric
- XCTOSSignpostMetric.scrollDecelerationMetric
- XCTOSSignpostMetric.scrollDraggingMetric
Application state can be reset to avoid tests influencing themselves: XCTMeasureOptions().invocationOptions = [.manualStop]
Listen to a live testing session at 8:15

Why is my app getting killed?

https://developer.apple.com/wwdc20/10078

Presenter: Andy Aude

Most common reasons why apps can be terminated in the background
- 碰撞
  - 分割故障
  - Illegal instruction
  - Asserts and uncaught exceptions
- CPU resource limit
  - High sustained CPU load in background
  - Energy Exception Report
    - Xcode Organizer
    - MXCPUExceptionDiagnostic
  - Reports contain call stack points out hotspots in code
  - Consider moving work into BGProcessingTask
- 看门狗
  - Long hang during key app transitions
    - application(_:didFinishLaunchingWithOptions:)
    - applicationDidEnterBackground(_:)
    - applicationWillEnterForeground(_:)
  - These transitions have a time limit on the order of 20 seconds
  - Terminations are disabled in Simulator and in the Debugger
  - Eliminate deadlocks, infinite loops, synchronous work
  - Report available via MXCrashDiagnostic
- Memory limit exceeded
  - App using too much memory
  - Same limit for foreground and background
  - Use Instruments and Memory Debugger
  - Keep in mind older devices
- Memory pressure exit (jetsam)
  - Not a bug with your app
  - Most common termination
  - System freeing up memory for active applications
  - Reducing jetsame rate
    - Aim for less than 50MB in background
    - Upon background flush state to disk, clear out image views, drop caches
  - Recovering from jetsame
    - Save state upon entering background
    - Adopt UIKit State Restoration
    - User should not realize app was terminated
- Background task timeout
  - UIApplication.beginBackgroundTask(expirationHandler:)
  - UIApplication.endBackgroundTask(_:)
  - Failure to end the task explicitly result in termination
  - Counts exposed via MXBackgroundExitData
  - Preventable
    - Use the named variant of the UIKit API beginBackgroundTask(withName:expirationHandler:)
    - Terminations do not occur in Debugger
    - New console message in iOS 13.4 ( Background Task DatabaseTransaction was created over 30 seconds ago. In Applications running in the background, this creates a risk of termination. Remember to call endBackgroundTask for your task in a timely manner to avoid this. )
  - Expiration handler
    - Implement an expirationHandler
    - Call endBackgroundTask(_:) inside the handler
    - Do not begin new work
    - Do not rely on it exclusively
    - Add telemetry at the start and end of each expiration handler
    - Inspect MXMetricPayload
  - Check backgroundTimeRemaining
    - Only start work if plenty of time remains
    - Unsafe to begin tasks with < 5 seconds remaining
  - Avoid leaking UIBackgroundTaskIdentifier
New MetricKit API (iOS 14)
- MXBackgroundExitData shows how often these terminations happen providing counts of each termination type
  - cumulativeBadAccessExitCount
  - cumulativeIllegalInstructionExitCount
  - cumulativeAbnormalExitCount
  - cumulativeMemoryResourceLimitExitCount
  - cumulativeMemoryPressureExitCount
  - cumulativeSuspendedWithLockedFileExitCount
  - cumulativeAppWatchdogExitCount
  - cumulativeBackgroundTaskAssertionTimeoutExitCount
  - cumulativeNormalExitCount
- Crash reporting via MetricKit
  - Diagnostics on a per-device basis
  - Ability to get crash info programmatically directly from the device
  - MXCrashDiagnostic
    - 堆栈跟踪
    - 信号
    - 异常代码
    - Termination reason
  - Check out What's New in MetricKit to get detailed information
How to improve multi-tasking experience?
- Identify and fix terminations
- Reduce memory usage
- Implement state restoration

What's new in MetricKit

https://developer.apple.com/wwdc20/10081

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Integrate your app with Wind Down

https://developer.apple.com/wwdc20/10083

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Feature your actions in the Shortcuts app

https://developer.apple.com/wwdc20/10084

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design for intelligence: Apps, evolved

https://developer.apple.com/wwdc20/10086

Presenter: Mark Mikin

This is one of those "why" sessions. Why we should build something?
Intelligent System Experience
- The main idea is to be proactive
- Intelligence is how the OS works with the apps that people use every day to make the "every day" easier for people
- Intelligence is design (it should be viewed as a design practice)
Living design .那是什么？
- The core job of the designer is to help people accomplish something
- One of the key ways a designer can leverage this is by using elements familiar to the user
- People use a signifier or a symbol
- For example, "Share" button. In the case of iOS, almost everyone can easily recognize the "default" share symbol because it consistently gets used across a lot of apps
- Intelligence is a platform convention, it's in a static glyph or icon, like the share button.它是活的
- Intelligence manifests itself by adapting to how the system, the platform, conforms to how people use their devices
- Intelligence is expected (people expect their devices and apps to be smart)
可扩展性
- Intelligence is powered by an app through extensibility
- Apps have actually been evolving over time
- A lot of the technologies built by Apple that are foundational to the intelligence system (starting from App Extensions debuted at WWDC 2014 and ending with App Clips so far)
- It's built to help growing ecosystem of devices and apps
- Intelligence system is built from a foundation of respecting users privacy
In the next sessions about system intelligence, Apple's team will try to cover it from a few different angles

Design for intelligence: Make friends with "The System"

https://developer.apple.com/wwdc20/10087

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design for intelligence: Discover new opportunities

https://developer.apple.com/wwdc20/10088

Presenters: JP Lacerda

智力
- Goal to make your Apple products knowing/understanding you
- Achieve and Discover more, Less tedium, Fewer distraction
- System helps you through suggestions from Siri , Shortcuts , Suggestions , Widgets
Siri / Shortcuts
- Helps you getting things done by a single tap or asking Siri
- Helps you setting up simple and complex operations ran, eg just by your voice
- View shortcuts through the new Siri suggestion Widget displayed just at the right time to you using the new smart stack and on-device intelligence
- Siri suggestions automatically appear at the right place and time, eg restaurant reservations are added automatically to the calendar
- Siri can remind you when it's time to leave right on your lock screen
- Get Siri suggestions in Maps to eg conveniently find your way to the Airport
Privacy / Analytics
- Apple chose opt-in to enable analytics on your device to help improve their intelligence services
- 例子
  - 82% of all notification-based check-ins come from suggestions (data from some Airline apps)
  - Apps are visible on average 5x more per day via lock screen, sharing suggestion, search or other entry points
Give your app superpowers
- Think about which entry points are suitable for your app
- Consider how you can measure the impact of intelligence on your app
- Understand intelligence from the users perspective

Discover Core Image debugging techniques

https://developer.apple.com/wwdc20/10089

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Decode ProRes with AVFoundation and VideoToolbox

https://developer.apple.com/wwdc20/10090

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Write tests to fail

https://developer.apple.com/wwdc20/10091

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build for the iPadOS pointer

https://developer.apple.com/wwdc20/10093

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Handle trackpad and mouse input

https://developer.apple.com/wwdc20/10094

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

The Push Notifications primer

https://developer.apple.com/wwdc20/10095

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore Packages and Projects with Xcode Playgrounds

https://developer.apple.com/wwdc20/10096

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Advances in UICollectionView

https://developer.apple.com/wwdc20/10097

Presenters: Steve Breen

Diffable Data Source
- 回顾
  - UICollectionView was first released in iOS 6
  - UICollectionView was built on the separation of concerns between the data, or the "what"; from the layout, the "where" content is being rendered.
  - For layout, an abstract class is UICollectionViewLayout , and a concrete subclass is UICollectionViewFlowLayout .
  - For the presentation, there are UICollectionViewCell and UICollectionReusableView .
  - In iOS 13, there are two new components for Data and Layout respectively with Diffable Data Source and Compositional Layout.
- Section snapshot [New in iOS 14]
  - Allow data sources to be more composable into section-sized chunks of data.
  - Allow modeling of hierarchical data, which is needed to support rendering outline-style UIs.
Compositional Layout
- 回顾
  - Compositional Layout was introduced in iOS 13
  - Allows us to build rich, complex layouts by composing smaller, easy-to-reason bits of layout together.
  - Describes what the layout to look like instead of how the layout ought to work.
  - Section-specific layouts to help you build more sophisticated UIs
  - Support for orthogonal scrolling sections.
Lists [New in iOS 14]
- UITableView -like sections right in to any UICollectionView .
- Rich with features you've come to expect from UITableView , like swipe actions and many common cell layouts.
- Easily mix and match Lists with other kinds of layout on a per-section basis.
- Concrete UICollectionViewListCell , header and footer support
- New Sidebar appearance we see in many iPadOS system apps.
Modern Cells
- Cell registrations
  - Simple, reusable way to set up a cell from a view model.
  - Eliminate the extra step of registering a cell class or nib to associate it with a reuse identifier.
  - Use a generic registration type which incorporates a configuration closure for setting up a new cell from a view model.
- Cell content configurations.
  - Standardized layouts for cells similar to what is seen in UITableView standard cell types.
  - Can be used with any cell, or even a generic UIView.
- Background configurations.
  - Similar to content configurations but apply to any cell's background with the ability to adjust properties such as color, border styles and more.

What's new in Universal Links

https://developer.apple.com/wwdc20/10098

Presenter: Christopher Linn

Universal Links
- HTTPS URLs that represent your content both on the web and in your app
- Allow to open your app instead of browser
- Enable by adding an entitlement to your app and a JSON file to your web server - creates secure association between both
- Custom URL schemes not recommended anymore - switch as soon as possible
Support for watchOS
- Same functionalities like on iOS, tvOS and macOS
- Apply entitlement to your WatchKit extension - not your WatchKit App
- Use [WKExtensionDelegate.handle(_ userActivity: NSUserActivity) -> Void](https://developer.apple.com/documentation/watchkit/wkextensiondelegate/2798966-handle) to handle Universal Links
- Use [WKExtension.shared().openSystemURL(url)](https://developer.apple.com/documentation/watchkit/wkextension/1628224-opensystemurl) to open Universal Links in other apps
- Different API on iOS (UIKit) and macOS (AppKit)
Universal Links in SwiftUI
- Now it is possible to handle Universal Links equally on all platforms
- Handle Universal Links using .onOpenURL { url in /* ... */ }
- Open Universal Links in other apps using @Environment (.openURL) var openURL; let url = /* ... */; openURL(url)
Enhanced Pattern Matching
- * matches zero or more characters greedily
- ? matches any one character
- *? matches at least one character
- "components": [{ "/": "/sourdough/?*", "caseSensitive": false }] for case-insensitive pattern matching (macOS Catalina 10.15.5 and iOS 13.5)
- "components": [{ "/": "/中國哲學書電子化計劃/?*", "percentEncoded": false }] for Unicode pattern matching (macOS Big Sur and iOS 14)
- "defaults": { "percentEncoded": false, "caseSensitive": false } to specify defaults for all components (macOS Big Sur and iOS 14)
  - Apply defaults to "details" (includes app IDs and components) or only to "components" to match all elements of the respective arrays
Substitution Variables
- Named lists of substrings to match against
- Names can contain anything but $ , ( , )
- Names are always case sensitive in patterns
- Values can contain ? and * but no other substitution variables
- Values are case-sensitive by default
- Available today in macOS Catalina 10.15.6 and iOS 13.5
- Predefined Substitution Variables
  - $(alpha)* - match upper and lower case letters
  - $(upper),$(lower)* - match either upper or lower case letters
  - $(alnum)* - match upper and lower case letters including digits
  - $(digit),$(xdigit)* - match either digits or hexadecimal digits
  - $(region)** - match every ISO region code defined by Foundation: Locale.isoRegionCodes
  - $(lang)** - match every ISO language code defined by Foundation: Locale.isoLanguageCodes
  - Use "exclude": true to exclude specific patterns
  - Substitution variables can be used to form different combinations of patterns, eg show different menus for different countries
  - 例子
```
{
  "appLinks" : {
    "substitutionVariables" : {
      "food" : [ " burrito " , " sushi " ],
      "Canadian food" : [ " burrito " , " poutine " , " tête-de-violon " ]
    },
    "details" : [{
      "appIDs" : [ " ABCDEF.com..example.restaurant " ],
      "components" : [
        { "/" : " $(lang)_CA/$(Canadian food)/ " , "percentEncoded" : false }
        { "/" : " $(lang)_CA/$(food)/ " , "exclude" : true }
        { "/" : " $(lang)_$(region)/$(food)/ " }
      ]
    }]
  }
}
```
Universal Links Workflow
- After download of an app the system checks its entitlements to see if it needs any app-association files, and downloads them
- App association files can now be downloaded in parallel by connecting to an Apple CDN instead of opening one connection per downloaded app
  - CDN is dedicated to associated domains
  - CDN uses single HTTP/2 connection for all associated domains on a device
  - CDN Reduces load on your server
  - CDN routes devices to a known-good, known-fast connection
- Alternate Modes for internal domains not reachable from an Apple CDN
  - Managed Mode when distributing within your organization (see What's New in Managing Apple Devices (WWDC20))
    - System trusted root certificate
    - MDN admin must opt-in
    - Works using any profile
  - Developer Mode when building your app
    - Use any SSL certificate
    - User must opt-in from iOS Settings > Developer > Associated Domains Development or for macOS using the command swcutil developer-mode -e true
    - Only works using a development profile
  - Server path for all modes: https://example.com/.well-known/apple-app-site-association
  - Specify domains for different modes in the entitlements as <string>applinks:testing.example.com?mode=developer</string> (or ?mode=managed or ?mode=developer+managed ) in an array under the key com.apple.developer.associated-domains

Explore the Action & Vision app

https://developer.apple.com/wwdc20/10099

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Keynote ★

https://developer.apple.com/wwdc20/101/

App Library
- Automatically created at the end of your app pages on the Home Screen
- Makes it easier than ever to get to your apps
Widgets on Home Screen
- Richer UI - more possibilities
- Different sizes to choose one that best fits your needs
- Droppable on the home screen
- Widget gallery to explore all widgets
- SmartStack as intelligent assistant which enables you to scroll through your widgets
Picture in Picture on iPhone
- Swipe to the side, out of the screen, and audio keeps playing
- Video keeps playing when switching apps
西里
- Got smarter and has a new interface which doesn't block your UI anymore
- Can now send audio messages using the messages app - completely hands free
Translate as new app of offline conversation translate
- Conversation mode when switching to landscape mode in the app
消息
- Pinning messages to the top of the screen
- Memoji gets hundreds of new options to customize your avatar, including masts, fist-pumps and more
- Group conversations got some ❤️ by adding inline replies and most-active member widget
地图
- More countries like UK, Ireland and Canada
- It gets easier to find places you love and how you get there in an ecological way
- Maps offers Guides that help you discover great new places
- Brand new cycling option to reduce your carbon footprint
- EV-Routing option to optimize your route for electric cars - eg by selecting routes with charging station on your way
CarPlay
- New wallpaper option
- New categories for CarPlay apps: Parking, EV-Charging, and Quick-Food ordering
- Car Key API - first supported by BMW - enable open/close/start your car
App Clips as small, fast parts of an app, designed for speed
- A way to discover what the App Store has to offer
- Launchable from the web, by NFC tags, QR codes or the brand new Apple designed tags
- Needs to be smaller than 10 MB
- Use Sign in With Apple to provide the most seamless app experience
- Use Apply Pay to allow quick payments
- Option to download the full app
iPadOS
- Photos app gets an all new side bar - new way to navigate and organize your photos
- Incoming calls become unobtrusive using notification style UI (available for all apps: WhatsApp, Skype, ...) • available for iOS too
- New searching experience
苹果铅笔
- Scribble lets you hand-write in any text field. iOS converts your writing then to text
- Smart Selection lets you select single words / characters you've written using your pencil using iOS text recognition features
- DataDetectors are used to automatically detect eg phone numbers, email addresses
airpods
- are now able to automatically switch to new incoming audio sources
- Spatial Audio for AirPods Pro (AirPods Motion API) to emulate movie theatre experience using AirPods gyroscope to sync the sound to your head position/orientation
watchOS 7
- Configure your own watch faces styled by your current living style
- Watch faces can now be shared on Websites or via the usual sharing features of watchOS
- Workout app adds dance, cooldown, functional training and more workouts plus it is renamed to Fitness
- Sleep Tracking is a new app that helps you to get to bed at time using Wind Down which dims all distractions (also available in iPhone)
- Handwashing detection to make sure you wash as long as you're supposed to (20 seconds shown in demo)
Privacy Improvements
- Location only share rough location
- 相机...
- Tracking Control require apps to ask before tracking
- App Privacy makes data tracked by developers visible to the users before they download the app
家
- Alliance among different manufacturers to make smart home devices even better
- Adaptive lighting to auto-adjust color temperature throughout the day
- Cameras get activity zones, richer notifications
- Face recognition extends to Home Pod
- Camera content can be displayed on TV via your Apple TV
- Apple TV
  - 图片中的图片
  - Better Airplay in full 4K
  - Apple TV+ already on over 1 billion devices
  - Foundation as newest production only available on Apple TV+
Macos Big Sur
- use of a lot of translucency
- Design refresh for all system apps
- New side and compact, space efficient toolbars
- Control center now on the mac
- 通知中心
  - Notification grouping
  - iOS widgets also available on the mac
- Messages with new search, photo picker, messages effects, pin conversations, inline replies and more
- Maps with indoor-maps, favorites, ETA from friends and all of it implemented using Catalyst
- Safari with 50% faster page loading, Privacy Report via toolbar button, Web Extensions API, built-in translation
苹果
- Processor-transition to Apple Silicon - Apple's own processor line - bye bye Intel
- Universal 2 is the new universal binary type that contains binaries compiled for both architectures
- Rosetta 2 lets existing app run on new architectures from day one by making them compatible at installation time
  - Supports iPhone and iPad apps directly

Meet Watch Face Sharing

https://developer.apple.com/wwdc20/10100

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design great widgets

https://developer.apple.com/wwdc20/10103

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Adopt the new look of macOS

https://developer.apple.com/wwdc20/10104

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build for iPad

https://developer.apple.com/wwdc20/10105

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Meet Scribble for iPad

https://developer.apple.com/wwdc20/10106

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in PencilKit

https://developer.apple.com/wwdc20/10107

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Support hardware keyboards in your app

https://developer.apple.com/wwdc20/10109

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Support local network privacy in your app

https://developer.apple.com/wwdc20/10110

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Boost performance and security with modern networking

https://developer.apple.com/wwdc20/10111

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build local push connectivity for restricted networks

https://developer.apple.com/wwdc20/10113

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

iPad and iPhone apps on Apple Silicon Macs

https://developer.apple.com/wwdc20/10114

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

AutoFill everywhere

https://developer.apple.com/wwdc20/10115

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

VoiceOver efficiency with custom rotors

https://developer.apple.com/wwdc20/10116

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Accessibility design for Mac Catalyst

https://developer.apple.com/wwdc20/10117

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Create app clips for other businesses

https://developer.apple.com/wwdc20/10118

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Introduction to SwiftUI

https://developer.apple.com/wwdc20/10119

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Streamline your app clip

https://developer.apple.com/wwdc20/10120

Presenters: Yongjun Zhang, Luming Yin

Best practices
- Focus on essential tasks
- Limit the features. Reserve complex features for your app
- Require all assets for initial experience
- Do not include splash screens
- Avoid requiring people to sign up before finishing their task
- Only ask for location and notification permissions if needed (more on this below)
- Make sure your App Clip has the same name and icon as your app
- Put shared assets in a shared asset catalog
- 验证
  - Support Sign in with Apple
  - Use ASWebAuthenticationSession for other federated login
  - Offer username and password login for existing users
  - Offer "Sign In With Apple" upgrade in the app
- For privacy reasons, and because App Clips are ephemeral, some contents are not available to App Clips, such as HealthKit info
- App Clips can request permission to use Bluetooth, the camera, and microphone
Streamlining Transactions
- 2 new types of ephemeral permissions: Location and Notification
  - Allows App Clips to check if the user is within a region, without prompting for location permission
    - Add NSAppClipRequestLocationConfirmation with value true in your Info.plist to enable this
    - Supports checking a region with a radius of up to 500 meters
  - Allows App Clips to send notifications for up to 8 hours after each launch, without prompting for notification permission .
    - Add NSAppClipRequestEphemeralUserNotification with value true in your Info.plist to enable this
    - Check the authorization status in the NotificationSettings , under the new .ephemeral status
  - Users can explicitly disable these permissions via App Clip settings panel
  - App Clips can prompt the user for full Location and Notifications access, although discouraged
- Strongly suggest using ApplePay
- Strongly suggest using "Sign In With Apple"
- Use AuthenticationServices API to sign your users in without showing a login screen (assuming they have already previously signed up in your website for instance)
Transition users to your app
- iOS suggests downloading your app from App Clip experiences, banners and App Clip settings
- You can embed StoreKit SKOverlay in a view
  - Suggestion: display this overlay only after the user finishes their task, eg after payment
- Transfer data on device with a secure App Group
  - Only accessible between your App Clip and your app
  - Once user downloads the app, the App Group will be transferred to the app after the App Clip is deleted
  - Migrate your "Sign In With Apple" session from your App Clip by persisting the user ID in the secure App Group. Use ASAuthorizationAppleIDProvider to verify the user's session without prompting UI

Discover AppleSeed for IT and Managed Software Updates

https://developer.apple.com/wwdc20/10138

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Leverage enterprise identity and authentication

https://developer.apple.com/wwdc20/10139

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build location-aware enterprise apps

https://developer.apple.com/wwdc20/10140

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build scalable enterprise app suites

https://developer.apple.com/wwdc20/10142

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in Mac Catalyst

https://developer.apple.com/wwdc20/10143

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design for Game Center

https://developer.apple.com/wwdc20/10145

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Configure and link your app clips

https://developer.apple.com/wwdc20/10146/

Presenters: Ada Chan, Luming Yin

简介
- App Clips provide entry points to your users to experience your app with minimal friction.
- Use deep-linked navigation to present the App Clip
User Quest
- User is in a smoothie shop. They see an NFC tag and tap it using the phone.
- An app clip shows up on the phone's lockscreen with summarized detail about that smoothie.
- User taps "open" and a single screen of your app shows up.
- User can then proceed to the payment via Apple Pay.
激活
- Tapping NFC tags or scanning QR codes - they're just deep links after all (a URL)
- Maps and Siri Nearby Suggestions (for registered businesses)
- Smart app banner in your website (shown in Safari and Messages)
- Apple App Clip codes will be introduced later this year (it's a prettified QR code)
- If the user already has the your app installed, following an App Clip link will open the full app instead.
设置
- Configure web server and App Clip for link handling
  - Web Server: Update the apple-app-site-association file
  - App Clip: Add associated domains entitlement and handle NSUserActivity
- Configure App Clip default and advanced experiences on App Store Connect
  - Layout requirements:
    - Title: 18 chars limit
    - Subtitle: 43 chars limit
    - 图像：
      - Size: 3000 x 2000px
      - Aspect Ratio: 3:2
      - Format: png/jpg
      - Transparency: No
  - 最佳实践
    - URL mapping is based on most specific prefix match against registered App Clip experience URLs
    - Your App Clip must be able to launch using an exact registered URL.例如：
      - App registers https://bikesrental.com/rent instead of https://website.com/rent?bikeID=2
      - When receiving https://website.com/rent?bikeID=2, it should be able to deliver the https://website.com/rent App Clip
      - App is responsible for parsing the remaining arguments and presenting the specific bike with ID 2
      - You can also register a more specific URL if you want to provide a different and more specific App Clip experience for it
- Configure the Smart App Banner to open App Clip (add this if the content of your web page can be delivered as a better and more streamlined app experience)
  - Add/update your website's HTML to add the Smart App Banner meta tag
测试
- Specify an App Clip URL under the _XCAppClipURL environment variable to launch App Clip from Xcode
- TestFlight - new App Clips section in App Store Connect

Distribute binary frameworks as Swift packages

https://developer.apple.com/wwdc20/10147

Presenters: Boris Buegling

Xcode 11
- Introduction of Swift Packages to distribute libraries as source code
- Introduction of XCFrameworks to distribute closed-source binary frameworks and libraries
Xcode 12 adds support for binary dependencies
Binary Dependencies (XCFrameworks)
- Used to distribute closed-source frameworks, static and dynamic libraries
- Contain a single module
- Easily addable via the Xcode > File > Swift Packages > Add Package Dependency
- Has sub directories corresponding to platform and target environment, each containing a framework
- Declare dependency in your Package.swift using .package(url: "https://github.com/owner/package", from: "1.0.0")
Distribute Binary Frameworks as a Swift Package
- New target type .binaryTarget(name: "Emoji", url: https://example.com/Emoji/Emoji-1.0.0.xcframework.zip, checksum: "6d98....")
- Binary targets can be offered to clients just like regular targets
- Binary Targets
  - Use XCFrameworks
  - Only supported on Apple platforms
  - HTTPS or path based - paths can point to files inside your package
  - Name corresponds to the module name
  - Use semantic versioning
Create your own Binary Dependency
- Create File > New Swift Package
- Replace template-added targets and add a binary target
- Compute the checksum using swift package compute-checksum Emoji-1.0.0.xcframework.zip
- Set Build Libraries for Distribution build setting
- Archive each variant
- xcodebuild -create-xcframework
- See 2019 session "Binary frameworks in Swift" or read the session notes which is way quicker
Tradeoffs of Binary Dependencies
- Harder to debug since source code is missing
- You won't be able to compile for your specific platform if not included by the author

Inspect, modify, and construct PencilKit drawings

https://developer.apple.com/wwdc20/10148

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Structure your app for SwiftUI previews

https://developer.apple.com/wwdc20/10149

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in CareKit

https://developer.apple.com/wwdc20/10151

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Use model deployment and security with Core ML

https://developer.apple.com/wwdc20/10152

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Get models on device using Core ML Converters

https://developer.apple.com/wwdc20/10153

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Control training in Create ML with Swift

https://developer.apple.com/wwdc20/10156

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Deliver a better HLS audio experience

https://developer.apple.com/wwdc20/10158

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build an Endpoint Security app

https://developer.apple.com/wwdc20/10159

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Formatters: Make data human-friendly

https://developer.apple.com/wwdc20/10160

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design for location privacy

https://developer.apple.com/wwdc20/10162

Presenter: Rachel Needle

Today people share precise location data
In iOS 14, Core Location allowing users to control and share their approximate location
All kinds of apps will be impacted by this change (even Apple's apps)
How to adapt the app to work without precise location?
- Prioritize user control
  - Give everyone control over their location data they share and respect their preferences
  - Don't require precise location
  - Replace precise data with approximate where possible
  - Identify where else you use precise location and remove non-essential uses of precise location
- Build trust through transparency
  - Communicate with people about what data your app uses and how that data is used
  - Make status easy to access
  - Allow users to change their decision
- Offer proportional value
  - Only ask for precise location when you really need it
  - Request precise location in response to user action
  - Position the request close to the value it provides
- Consider checking out these two sessions to get detailed information
  - Build trust through better privacy
  - What's new in location

Advancements in the Objective-C runtime

https://developer.apple.com/wwdc20/10163

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

XCTSkip your tests

https://developer.apple.com/wwdc20/10164

Presenters: Wil Addario-Turner

Tests can pass or fail, or with XCTSkip , be marked with an explicit "skip" result.
In Xcode 11.4, XCTSkip , XCTSkipIf and XCTSkipUnless were introduced to allow skipping tests at runtime.
Call throw XCTSkip("message") and the test will be skipped.
XCTSkipIf skips when the expression is true. XCTSkipUnless skips when the expression is false.
Check the results from the test navigator and the test report with the line where the skip occurred, along with a reason explaining why.

Embrace Swift type inference

https://developer.apple.com/wwdc20/10165

Presenter: Holly Borla

Leveraging type inference
- A type can be inferred by the compiler given the context surrounding a variable or function
- SwiftUI code relies on type inference for reusable views
- A demo is presented showing a SwiftUI component being built using generics
How type inference works in compiler
- Think of type inference as a puzzle
- It resolves the puzzle by filling in the missing pieces using clues from the source code
- Solving one puzzle can give the compiler more clues on how to solve other puzzles
- Type inference errors
  - If a puzzle can't be solved, there's an error in the source code
  - During type inference, the compiler will record information about errors in source code
  - Compiler uses heuristics to attempt to fix errors in order to continue type inference
  - Once type inference is done, the compiler will provide actionable error messages based on collected information (some errors might have auto-fixes)
- Swift 5.3 and Xcode 12 improved error handling a lot, showing more meaningful and reliable error messages
Using Swift and Xcode to fix compile errors
- The compiler will leave breadcrumbs about what the compiler was doing when it found an error
- This can help you connect the dots between the error you're seeing on the editor and other files in your project
- Hold ⌥ + ⇧ on an error breadcrumb and drag it to the right of the source editor, to open the source editor and the breadcrumbs details side by side

Safely manage pointers in Swift

https://developer.apple.com/wwdc20/10167

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore logging in Swift

https://developer.apple.com/wwdc20/10168

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Swift packages: Resources and localization

https://developer.apple.com/wwdc20/10169

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in Swift

https://developer.apple.com/wwdc20/10170

Presenters: Ted Kremenek, Kyle Macomber

Swift Releases
- Xcode 11.4 - Swift 5.2
- Xcode 12 (beta) - Swift 5.3
运行时性能
- Code Size
  - Code size is the part of the app that represents the machine code representation of the app's logic
  - Swift 5.3 is below 1.5 times the code size of Objective-C version (based on app that ships with iOS)
  - Size difference is inevitable because of Swift safety features
  - SwiftUI app binary code size can be reduced by 40% (based on MoviesSwiftUI app)
- Memory Layout
  - Comparing models with three properties in Obj-C ( NSUUID , NSString and float ) and Swift ( UUID , String , Float )
  - In Obj-C, object variables are just pointers which then hold a pointer to their properties
  - Swift's use of value types avoid the need to access values via pointers (UUID and Strings)
  - Significant memory benefit because it is allocated directly within array storage (contiguous block of memory)
  - Heap memory use comparison: 20kB in Swift 5.1 vs 35kB in Obj-C (400 models in array)
  - Swift's Standard Library now is below Foundation in the stack which means it can be used to develop low-level frameworks for Objective-C frameworks where previously C has to be used!
诊断
- New diagnostics in the Swift compiler result in more precise and actionable errors
- Additional notes in error messages (SwiftUI as an example)
- More info on swift.org
代码完成
- Much better code completion thanks to improvements in SourceKit
- Code completion for dictionary literals, ternary expressions and more dynamic features like key paths
- Code completion in Xcode 12.0 is 15x faster compared to Xcode 11.5
Code Indentation
- Improved indentation formatting in chained methods calls, tuples, multiline if and guards
- Improved indentation in SwiftUI as well
调试
- Debugger now displays the reason for Swift runtime failure traps
Cross-Platform Support
- Multiple platform support
  - Apple Platforms
  - Ubuntu 16.04, 18.04, 20.04
  - CentOS 8
  - 亚马逊Linux 2
  - Windows (coming soon)
- Swift on AWS Lambda
  - Runtime is open-source and is available on GitHub
语言
- Swift Evolution website
- Multiple trailing closure syntax SE-0279
  - It's important to set the correct base name of the method that will indicate the first trailing closure that its label will be dropped
- Key Path Expressions as Functions SE-0249
- @main : Type-Based Program Entry Points SE-0281
  - The standardized way to delegate a program's entry point
- Increased availability of implicit self in @escaping closures when reference cycles are unlikely to occur SE-0269
  - Now it's possible to add self to the capture list
  - In Swift 5.3, if self is a structure it can be omitted entirely from the closure
- Multi-Pattern Catch Clauses SE-0276
- Enum Enhancements
  - Comparable conformance is now synthesized automatically SE-0266
  - Enum cases as protocol witnesses SE-0280
- Embedded DSL Enhancements
  - Builder closures
  - Swift 5.3 introduces pattern matching statements like if let and switch
  - Builder inference ( @SceneBuilder is not longer needed)
库
- Float16 SE-0277
  - Half-width floating point type
  - Performance gains but low precision and small range
- Apple Archive
  - Modular archive format
  - Fast compression
  - Idiomatic Swift API
- Swift System
  - Idiomatic Swift interface to system calls
  - Low-level currency types
  - Wraps Darwin APIs
- OSLog
  - Unified logging API
  - Faster and more expressive (formatting options)
- 软件包
  - Swift Numerics
    - Support for complex numbers and basic math functions
  - Swift ArgumentParser
  - Swift Standard Library Preview
    - Includes features that have not been included in the release yet

What's new in watchOS design

https://developer.apple.com/wwdc20/10171

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design great app clips

https://developer.apple.com/wwdc20/10172

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Get the most out of Sign in with Apple

https://developer.apple.com/wwdc20/10173

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore app clips

https://developer.apple.com/wwdc20/10174

Presenters: James Savage, Luming Yin

What is an App Clip?
- App Clip Experience URL is required to run App Clips which are parts of your app
- On-demand app experiences
App Clip Experiences
- App Clip URLs are similar to Universal Links
- Registered using App Store Connect
- Surfaced through user actions via NFC / QR codes / links in Safari or other apps / Apple App Clip codes combine the ease of NFC and visual codes so they can be tapped or scanned
New App Clip Target in Xcode
- Contains all assets
- Needs to be submitted along with the app for review
- It gets downloaded separately if the app is not installed on user's device
- Should be as small as possible for quick downloads (less than 10MB but with enough assets to load UI quickly)
- Focused user flows - one at a time
演示
- Ordering smoothies
- New App Clip target embedded in the application
  - Name and bundle ID for App Clip added
  - It can build and run with boilerplate code right away
- Add code and resources
  - NutritionFacts dependency added
  - Create new Assets Catalog as shared assets
    - Drag App Icon, Colors and other image assets required for app clip into the shared assets catalog
  - Add the required model and view files to App Clip target
    - Let go of unwanted Swift files like navigation
  - Conditionally compile out the references to files not added to App Clip
    - Build Settings > Swift Compiler custom flags > Active Compilation Conditions > Add APPCLIP condition for required schemes.
    - Use #if !APPCLIP to compile out unwanted references in Swift code
- Write code for App Clip
  - Add required models and views to the new AppClip
  - Include existing views in the App Clip's content view
Technology Overview
- App Clips are built using same UI components as an app
- When launched, it receives NSUserActivity
  - Use the URL to identify the type of experience to be handled
- Unlike extensions, App Clip can make use of all iOS SDK APIs
  - Note: Access to sensitive data is limited
  - Always check if data is available
- New location confirmation API helps get the location quickly without requesting full access
- New API for migrating data from App Clip to main app using shared data container once installed
- App Clip and its local storage will be deleted after period of inactivity
  - Not included in backups
- Can not be launched via Universal Links or custom URL schemes
- Can not include bundle extensions like content blockers
Device states and transitions
- User scans QR code
- iOS locates, downloads and runs the App Clip
- If the App Clip is not revisited for a while, the App Clip and its data gets deleted
  - Treat App Clip data as cache; which can be deleted
- If the App Clip is visited frequently, its lifespan will be extended and data may never be cleared
  - When user downloads your app, iOS will automatically migrate the data container and the permissions that were already granted by the user
  - iOS still deletes the App Clip and its container after copying the data container to the app
Other technologies
- 苹果工资
- 通知
- 斯威夫特
- SKOverlay / AppStoreOverlayModifier (refer to What's new with in-app purchase session)
- ASAuthorizationController for sign in or sign up

The details of UI typography

https://developer.apple.com/wwdc20/10175

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Master Picture in Picture on tvOS

https://developer.apple.com/wwdc20/10176

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in HealthKit

https://developer.apple.com/wwdc20/10182

Presenter: Netra Kenkarey

症状
- Developers can now track symptoms in HealthKit, read and write symptom samples
- HealthKit attempted to cover and track a wide range of symptoms (shortness of breath, sleep changes, appetite changes, fever, headache, etc.)
- There are 13 symptom data types in HealthKit
Electrocardiogram (ECG)
- ECG samples will be available for reading in the latest version of iOS and watchOS
- An ECG sample can be read as an HKElectrocardiogram (it represents a waveform as a series of voltage values)
- ECG sample has important properties that describe the measurements
- classification ( HKElectrocardiogram.Classification )
  - Apple Watch will give the result of the recording in the form of a classification
  - The classification is divided into 2 types
    - Sinus Rhythm (heart is beating in a uniform pattern)
    - Atrial fibrillation (form of irregular rhythm, user should probably go see their doctor)
  - If Apple Watch is unable to determine the ECG result, either due to a low or a high heart rate or due to any other reason, the result is considered inconclusive
- symptomStatus ( HKElectrocardiogram.SymptomsStatus )
  - It tells if the user associated a symptom with this ECG (eg heartburn, tightness in the chest)
  - The symptom experienced can be recorded along with the ECG
- averageHeartRage ( HKQuantity? )
- samplingFrequence ( HKQuantity? )
- numberOfVoltageMeasurements ( Int )
  - It refers to the individual voltage measurements that make up an ECG sample
HKElectrocardiogramQuery
- To retrieve the individual measurements run the HKElectrocardiogramQuery
- Fetch the ECG samples with any of the HealthKit queries and then initialize the HKElectrocardiogramQuery with the fetched sample
- When this query is executed on the HealthStore, you get the individual voltage measurements back in the ECG and the data handler
机动性
- New set of mobility types (available for reading and writing on the latest iOS and watchOS)
  - Walking speed and step length
  - Walking assymetry and double support percentage
  - Stair ascent and descent speed
  - Six-minute walk test distance

Synchronize health data with HealthKit

https://developer.apple.com/wwdc20/10184

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Visually edit SwiftUI views

https://developer.apple.com/wwdc20/10185

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Discover WKWebView enhancements

https://developer.apple.com/wwdc20/10188

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Secure your app: threat modeling and anti-patterns

https://developer.apple.com/wwdc20/10189

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Create quick interactions with Shortcuts on watchOS

https://developer.apple.com/wwdc20/10190

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Add configuration and intelligence to your widgets

https://developer.apple.com/wwdc20/10194

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Broaden your reach with Siri Event Suggestions

https://developer.apple.com/wwdc20/10197

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Platform State of the Union ★

https://developer.apple.com/wwdc20/102/

Some new features: AirPods Motion API , SwiftPM resources , New Catalyst Controls , ARKit 4 , Widgets in SwiftUI , Depth API , TestFlight 100 Testers , SwiftUI Lifecycle , Catalyst Native Screen Resolution , Complications in SwiftUI , Xcode StoreKit Testing , HomePod Music Services , App Clips , New SwiftUI Controls , Xcode Tabs , ...
Users can make your app the default app used for email and set a default web browser
Developers can bring existing web-browser extensions to Safari using a new command line tool
FindMy can now leverage all iPhones out there to locate your devices, even if they are not connected to the internet (applicable to all kinds of objects)
Mac transition to Apple Silicon - Apple's own processor line - brings more security, better performance, longer battery life and amazing graphics
- 优势
  - Cached cloud content can be kept up to date for days, even if your mac goes to sleep
  - Higher quality, hardware-supported 4:4:4 encoder for eg better image quality when connecting your Mac via SideCar
  - Best-In-Class platform security
- Apple provides a Developer Transition Kit
  - Mac mini enclosure + A12Z SoC
  - 16GB memory, 512GB SSD
  - macOS Big Sur Developer Beta + Xcode
- First Macs will appear by end of the year
Universal 2 create universal apps that run on both Apple Silicon and older architectures
Porting to Apple Silicon takes only a few days, even for grown projects. As a result, all Apple system apps are already converted in macOS Big Sur
Rosetta 2 lets existing app run on new architectures from day one by making them compatible at installation time
- Supports iPhone and iPad apps directly
iOS/iPad Apps natively on Mac
- Apps will run natively on the Mac
- Apps will automatically support features like resizing, Dark Mode, scrolling, multi-window, native share sheets, ...
- Apple plans to make iOS/iPadOS apps available on the App Store for macs running with Apple Silicon
macOS Big Sur - macOS 11
- Rounded dock ?
- Control Center for mac
- New translucent look for notification center
- Refined layout for menus of the menu bar
- New sheet presentation - parent window is dimmed
- Completely re-designed toolbars with extending search fields and images provided by SF-Symbols
- App-specific accent color
- macOS Catalyst
  - macOS-specific implementation of iOS API's
  - Native resolution support
  - Messages re-written in Catalyst
  - SwiftPlaygrounds will support multiple windows
iPadOS
- New sidebars can now expand from two-column layout to three-column layout - even available in portrait mode
- Recommended to use side bars instead of tab bars
- New inline emoji picker - also for custom apps
- New color picker UI - easy to adopt
- New Depth APIs give you access to precise distance info captured by the LiDAR scanner on iPad
- Dramatic improvement of people inclusion and motion detection - objects can be placed in front or behind real objects in the world
- 苹果铅笔
  - New handwriting improvements will work in your apps without any additional work
  - Hand-writing for any UITextField
  - Automatic support for Scribble which converts any hand-written text to typed text
  - Stroke API gives access to the strokes as the user draws
  - Smart Selection lets you select single words / characters you've written using your pencil and iOS text recognition features
- iOS 14
  - 小部件
    - New widgets take UX to a whole new level
    - Users can move them to the home screen
    - Widgets are packed as SwiftUI archives which are optimized for performance
    - Are rendered by the system at the right time, when the user needs them
    - Can be smartly stacked to consume less space and let the user flip through them
    - Stack automatically moves the right widget to the top at just the right time
    - Configurable in the Widget Gallery
  - App Clips
    - Small part of the app which is light/fast and easy to discover
    - Can use Apple Pay and Sign in With Apple to provide a seamless UX
    - Easily discoverable in a variety of ways, like other apps or places in the real world via new Apple-designed (QR-like) codes which are basically NFC tags
    - Introduce users to what your app offers
  - 杂项。新功能
    - Cycling directions, Guides and EV routing in Maps
    - Translate app
    - Messages inline replies
    - Car keys
    - App Library
    - On device dictation
- watchOS 7
  - Xcode is now able to preview watchOS complications
  - SwiftUI complications
  - Watch-face sharing via any sharing capabilities, eg Messages, social media, etc
- Xcode 12
  - Cleaner, more expressive UI
  - Navigators realized using the new Side Bar
  - Any kind of content is now openable in document tab
  - Navigate through nested calls in compiler failure messages
  - StoreKit test environment lets you unit test In-App Purchase and Subscriptions
  - New StoreKit transaction manager shows details during debugging
  - Faster code completion with simplified presentation
- 斯威夫特
  - All SwiftUI apps will continue to compile without additional changes (Apple added no breaking changes - just extensions)
  - Lazy statement makes large collections of views way less memory hungry and makes scrolling snappy again
  - Now contains app-structure APIs for all Apple platforms, eg @main , @SceneBuilder , Settings , ...

Design for intelligence: Meet people where they are

https://developer.apple.com/wwdc20/10200

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Create great enterprise apps: A chat with Box's Aaron Levie

https://developer.apple.com/wwdc20/10204

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design with iOS pickers, menus and actions

https://developer.apple.com/wwdc20/10205

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design for iPad

https://developer.apple.com/wwdc20/10206

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

SF Symbols 2

https://developer.apple.com/wwdc20/10207

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in Core NFC

https://developer.apple.com/wwdc20/10209

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Modernize PCI and SCSI drivers with DriverKit

https://developer.apple.com/wwdc20/10210

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Port your Mac app to Apple Silicon

https://developer.apple.com/wwdc20/10214

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in ResearchKit

https://developer.apple.com/wwdc20/10216

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore numerical computing in Swift

https://developer.apple.com/wwdc20/10217

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build localization-friendly layouts using Xcode

https://developer.apple.com/wwdc20/10219

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Handle interruptions and alerts in UI tests

https://developer.apple.com/wwdc20/10220

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Get your test results faster

https://developer.apple.com/wwdc20/10221

Presenters: Sean Olszewski

The Testing Feedback Loop
- Write tests > run tests > Interpret result >if sufficient confidence [ > Next task] else go back to write tests
- Short feedback loops is important because that means you get results from your tests faster, you can ship features to your users faster.
- Real world example: Result bundle from that CI job, which never finished. Due to dead lock, poorly chosen timeout.
Execution Time Allowance [NEW in XCode 12]
- When enabled, Xcode enforces a limit on the amount of time each individual test can take. When a test exceeds this limit, Xcode will first capture spin dump, then kill the test that hung, restart the test runner, so that the rest of the suite can execute.
- A spin dump shows you which functions each thread is spending the most time in. It's also possible to manually capture spin dump from Terminal using the spin dump command or from within Activity Monitor.
- By default, each test gets 10 minutes. If you need to a specific test or test class, you can use the executionTimeAllowance API to special case a particular test or subclass. For values under 60 seconds, they'll be rounded up to 60 seconds, the nearest whole minute.
- Prevent a test requests unlimited time by enforcing a maximum allowance.
- You can customize the default time allowance and a maximum allowance either via a setting in the Test Plan or through an Xcodebuild option.
- Use XCTest 's performance APIs to automate testing for regressions in the performance. Use Instruments to identify what parts of your code are slow,
Parallel Distributed Testing
- Xcode build will distribute tests to each run destination by class. Each device runs a single test class at a time.
- If you're testing logic that is device or OS specific, this can lead to unexpected failures or skipped tests.

Create custom apps for employees

https://developer.apple.com/wwdc20/10222

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Deploy Apple devices using zero-touch

https://developer.apple.com/wwdc20/10223

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Meet Audio Workgroups

https://developer.apple.com/wwdc20/10224

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Improve stream authoring with HLS Tools

https://developer.apple.com/wwdc20/10225

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Record stereo audio with AVAudioSession

https://developer.apple.com/wwdc20/10226

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in Low-Latency HLS

https://developer.apple.com/wwdc20/10228

Presenter: Roger Pantos

Comes out of beta this year
Available in iOS 14, tvOS 14, watchOS 7 and this year's macOS
Includes support for bit-rate switching, FairPlay Streaming, fMP4 CMAF, ad insertion, captioning
Native app support, no entitlement necessary
draft-pantos-hls-rfc8216bis07 and later now includes LL-HLS
Includes Low-Latency Server Configuration Profile
Includes CDN tune-in algorithm
Updated informative articles on developer.apple.com
- Protocol Extension for Low-Latency HLS
- HLS Authoring Specification for Apple Devices
Significant changes and improvements to the protocol
- Reducing segment delay
  - Approach described last year using HTTP/2 Push to send segment with Playlist is not compatible with some delivery models
  - Replaced Push with Blocking Preload Hints
    - Client requests next part in advance
    - Server will hold on to the request until it can send it
    - Also triggers global CDN cache fill
    - Discover HLS Blocking Preload Hints session for more information
- 其他改进
  - Eliminated HLS report
    - All Rendition Reports are provided unconditionally
  - Defined EXT-X-DATERANGE handling for Playlist Delta Updates
    - Optimize Live Streams with HLS Playlist Delta Updates session for more detailed information
  - Added signaling of gaps in Parts and Rendition Reports
    - New attributes: GAP=YES in EXT-X-PART and EXTT-X-RENDITION-REPORT
    - This allowing clients to deal better with encoded outages in Low-Latency streams
Low-Latency HLS Tools changes
- Reference implementation now produces fMP4/CMAF
- Added self-contained LL-HLS origin written in Go
- Incorporated Low-Latency HLS tools into the regular HLS tools package
  - Find out more in Improve Stream Authoring with HLS Tools session
Summary of important changes
- Replaced HTTP/2 Push with Preloading Hinting
- Simplified Delivery Directives
- Generate CMAF in reference tools
Everything is included in the current HLS spec

Discover HLS Blocking Preload Hints

https://developer.apple.com/wwdc20/10229

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Optimize live streams with HLS Playlist Delta Updates

https://developer.apple.com/wwdc20/10230

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Reduce latency with HLS Blocking Playlist Reload

https://developer.apple.com/wwdc20/10231

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Adapt ad insertion to Low-Latency HLS

https://developer.apple.com/wwdc20/10232

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

The artist's AR toolkit

https://developer.apple.com/wwdc20/10601

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Harness Apple GPUs with Metal

https://developer.apple.com/wwdc20/10602

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Optimize Metal apps and games with GPU counters

https://developer.apple.com/wwdc20/10603

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Shop online with AR Quick Look

https://developer.apple.com/wwdc20/10604

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Gain insights into your Metal app with Xcode 12

https://developer.apple.com/wwdc20/10605

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore ARKit 4

https://developer.apple.com/wwdc20/10611

Presenters: Quinton Petty, Praveen Gowda

Location Anchors
- Geo-referenced AR Content
- Uses "visual localization" from Maps
  - No processing in the cloud
  - No images sent back to Apple
- Pinned to a geo-location
- 3 main parts
  - ARGeoTrackingConfiguration
  - ARGeoAnchor
  - ARGeotrackingStatus
- Device support A12 Bionic or later + GPS support
- Requires availability checks for both device and location
- ARGeotrackingStatus
  - State
  - StateReason
  - accuracy : low, medium, high
- Methods for converting between local and latitude / longitude positions via getGeoLocation(forPoint:)
- Recommended to point towards buildings / static objects
- May struggle in wide open spaces (eg a field)
- Locations currently available: San Francisco Bay Area, Los Angeles, New York, Chicago and Miami
- Sample: Tracking Geographic Locations in AR
Scene Geometry
- Topological map of environment
- Semantic classification
- Allowing for:
  - Occlusion
  - 物理
  - Virtual lighting
- Based upon the Depth API
Depth API
- Provides a dense depth image
- Use sceneDepth under frame semantics
- Runs at 60Hz, on every ARFrame
- depthMap and confidenceMap provided
- Depth map provided as CVPixelBuffer
- ARConfidenceLevel : high, medium or low
- Available on LiDAR devices
Object Placement
- Improvements in Raycasting
- Quicker placement with LiDAR sensor
- Allows for placing on a white wall
- Raycasting is recommend over hit-testing
- 2 types of query:
  - 射线广播
  - Tracked Raycasts
面部跟踪
- Support added for non-TrueDepth iPhones
- Requires A12 processor or later
- iPhone SE (2020)

What's new in RealityKit

https://developer.apple.com/wwdc20/10612

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in USD

https://developer.apple.com/wwdc20/10613

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Advancements in Game Controllers

https://developer.apple.com/wwdc20/10614

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build GPU binaries with Metal

https://developer.apple.com/wwdc20/10615

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Debug GPU-side errors in Metal

https://developer.apple.com/wwdc20/10616

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Bring keyboard and mouse gaming to iPad

https://developer.apple.com/wwdc20/10617

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Tap into Game Center: Dashboard, Access Point, and Profile

https://developer.apple.com/wwdc20/10618

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Tap into Game Center: Leaderboards, Achievements, and Multiplayer

https://developer.apple.com/wwdc20/10619

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Support performance-intensive apps and games

https://developer.apple.com/wwdc20/10621

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Bring your Metal app to Apple Silicon Macs

https://developer.apple.com/wwdc20/10631

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Optimize Metal Performance for Apple Silicon Macs

https://developer.apple.com/wwdc20/10632

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Capture and stream apps on the Mac with ReplayKit

https://developer.apple.com/wwdc20/10633

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Discover search suggestions for Apple TV

https://developer.apple.com/wwdc20/10634

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Accelerate your app with CarPlay

https://developer.apple.com/wwdc20/10635

Presenters: Jonathan Hersh, Allen Langmaier

New CarPlay App Possibilites
- 电动汽车充电
- 停車處
- Quick food ordering
Audio Apps
- Playable content template will be deprecated
- New audio template
New Templates
- 通信应用程序
  - CPMessageListItem
  - Contact template
- List template
- Tab bar template
- Now playing template
- Point of interest template
- Information template
CarPlay Design Principles
- Design for the driver
- Streamline interactions
- Reuse app configuration
- Launch first in CarPlay
- CarPlay apps must adapt UIScene
Updates to development
- Dynamic updates to list elements
- CPListItem
- CPListImageRowItem

What's new in streaming audio for Apple Watch

https://developer.apple.com/wwdc20/10636

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in managing Apple devices

https://developer.apple.com/wwdc20/10639

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design for the iPadOS pointer

https://developer.apple.com/wwdc20/10640

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Handle the Limited Photos Library in your app

https://developer.apple.com/wwdc20/10641

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build Image and Video Style Transfer models in Create ML

https://developer.apple.com/wwdc20/10642

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build a SwiftUI view in Swift Playgrounds

https://developer.apple.com/wwdc20/10643

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Use Swift on AWS Lambda with Xcode

https://developer.apple.com/wwdc20/10644

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Support multiple users in your tvOS app

https://developer.apple.com/wwdc20/10645

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in Web Inspector

https://developer.apple.com/wwdc20/10646

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Become a Simulator expert

https://developer.apple.com/wwdc20/10647

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Unsafe Swift

https://developer.apple.com/wwdc20/10648

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Add custom views and modifiers to the Xcode Library

https://developer.apple.com/wwdc20/10649

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Sync a Core Data store with the CloudKit public database

https://developer.apple.com/wwdc20/10650

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in App Store Connect

https://developer.apple.com/wwdc20/10651

Presenter: Daniel Miao

App Clips
- Beta Testing
  - Safari App Clip banner appears when a website is associated with an App Clip. Tapping brings up the App Clip Card . Tapping the card opens the app itself.
  - App Clips can be invoked from Safari, Messages, Maps, NFC Tags, QR Code or Location
  - Invocation URL from the website is used what to show on the App Clip Card and is passed to it upon tap of the banner
  - App Clip is packaged with the app and delivered to ASC
  - In the new App Clip Invocation Section on ASC you can provide titles and along with invocation URLs used in the App Clip
  - Title-URL combinations are selectable in TestFlight and take you directly to the App Clip by passing the invocation URL (without showing the App Clip Card)
- App Clip Card Meta Data
  - Header image, App Clip title, App Clip subtitle, call to action button
  - Enter the default meta data on the apps version page on ASC
  - Associate your website with the App Clip by including the meta-data tag <meta name="apple-itunes-app", content:"app-id=123456", app-clip-bundle-id:=org.appname.clip>
  - Use Advanced App Clip Experiences to get customized meta data and association with eg location in Maps
    - Advanced assistant on your app's version page on ASC to setup advanced experience
    - You can select to promote Your own business or Other Businesses (eg Yelp)
  - You have to specify an Apple App Site Association file (like with universal links) that has to match the Associated Domains Entitlement in your app
  - Manage / Debug your website association on ASC
游戏中心
- Challenges other players to get achievement
- Recurring Leaderboards to collect scores for a certain period of time
  - Reset after that time
  - Configurable on ASC
Family Sharing for Subscriptions
- Subscriptions can be shared among the family form fall 2020
- Auto-renewable subscriptions
- Non-consumables
- Automatic sharing for new customers
- Existing subscribers can opt-in
- Family-shared in-app purchase can be enabled on the ASC-In-App-Purchase section of your app
- Once turned on it cannot be tuned off again
App Store Connect API
- Over 200 new endpoints will be added
- Add App Meta Data API
  - Create new version
  - Set app pricing
  - Edit app and version metadata
  - Associate build with version
  - Submit app for review
- Add Power and Performance Metrics and Diagnostics API

Meet the new Photos picker

https://developer.apple.com/wwdc20/10652

Presenters: Tobias Conradi, Justin Jia

PHPicker
- Direct access to user's photo gallery
- Supports zoom in, multi-select, review
- Types are filterable
- Privacy built in by default
- It won't prompt the user for access
- It runs out of the app's process
  - Separate process rendered on top of the app
  - Only what user selects is passed back to the app
执行
- PHPickerConfiguration (which can include type filters) is passed to PHPickerViewController , which has delegates to handle responses
- PHPickerConfiguration
  - Selection limit
  - Image / Video type
- Initialize PHPickerViewController by using the configuration
- Set delegate and implement protocol functions
  - didFinishPicking
  - NSItemProvider - representation of the item, async, requires error handling
演示
- Photo preview app
- UIImageView with placeholder image
- Plus button for image selection
  - Present the new picker
  - Create PHPickerConfiguration with images filter and selection limit (set to zero for unlimited selection)
  - Initialize the PHPickerViewController with this configuration
  - Present the new controller after setting delegate and following the protocol
  - Implement didFinishPicking
    - Dismiss the picker first
    - Retrieve the image via item provider and use main queue to update your UI
  - Use IndexingIterator<[NSItemProvider]> to save array of item providers
  - Add touch event to iterate through the array of picked images
笔记
- AssetsLibrary will go away; switch to PhotoKit
- UIImagePickerController is to be deprecated and replaced with PHPickerViewController

Detect Body and Hand Pose with Vision

https://developer.apple.com/wwdc20/10653

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Create Swift Playgrounds content for iPad and Mac

https://developer.apple.com/wwdc20/10654

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Discover how to download and play HLS offline

https://developer.apple.com/wwdc20/10655

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Beyond counting steps

https://developer.apple.com/wwdc20/10656

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Make apps smarter with Natural Language

https://developer.apple.com/wwdc20/10657

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in education

https://developer.apple.com/wwdc20/10658

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Introducing StoreKit Testing in Xcode

https://developer.apple.com/wwdc20/10659

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in location

https://developer.apple.com/wwdc20/10660

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new with in-app purchase

https://developer.apple.com/wwdc20/10661

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in Wallet and Apple Pay

https://developer.apple.com/wwdc20/10662

Presenter: Stacey Abrams

Use Apple Pay to get into public transit and acadamic buildings
API Enhancements
- PKSecureElementPass replaces PKPaymentPass fom now
- New Apple Pay Button types: .reload , .addMoney , .topUp , .order , .rent , .support , .contribute , .tip
- See how to declare a Apple Pay Button on a website at 2:16
- PKPaymentButton style .automatic automatically switches between light and dark mode
Apple Pay in App Clips
- Could revolutionize everydays payment experience when you can eg just tap an NFC tag on a gas station to pay your gas
- Guest checkouts using Apple Pay do not require to setup an account anymore and if it is necessary seamless Sign in with Apple is used.
Enhancing Apple Pay experience across platforms
- Merchants can receive redacted billing address
  - Lower risk of chargebacks for merchnts
  - Price transparency leads to higher conversion rates
- Apple Pay for Catalyst
  - Brings great payment experiences to more mac apps
  - Brings the newly announced APIs, including the Apple Pay button, to the mac
- Improvements in WKWebView will allow more pages to allow Apple Pay transactions now
Contacts Formatting Improvements to prevent invalid shipping addresses
- Street and city fields contain vaild characters only
- State is a two letter code
- US: Zip code is 5 or 9 digit code
- ISO country code is upper case two letter code
- Improved experience when correcting information
  - Raise formatting errors earlier in the payment flow
  - Users can correct information prior to authentication
- Error APIs improved and aligned to new formatting options
- Only rolles out in some Australia, Canada, UK, US for now
Adding cards to Apple Pay
- Issuer Extensions to improve discoverability from within the Wallet app - needs installatioon of an Issuer app
- App requires non-UI extension
  - Extension principal object must subclass PKIssuerProvisioningExtensionHandler
  - Requires non-UI extension entitlement
- Added support for a UI extension
  - Needs to handle re-authentications if required by conforming principal object to PKIssuerProvisioningExtensionAuthorizationProviding
  - Requires UI extension entitlement

What's new for web developers

https://developer.apple.com/wwdc20/10663

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Getting started with HealthKit

https://developer.apple.com/wwdc20/10664

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Meet Safari Web Extensions

https://developer.apple.com/wwdc20/10665

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

One-tap account security upgrades

https://developer.apple.com/wwdc20/10666

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Custom app distribution with Apple Business Manager

https://developer.apple.com/wwdc20/10667

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Meet Nearby Interaction

https://developer.apple.com/wwdc20/10668

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Handling FHIR without getting burned

https://developer.apple.com/wwdc20/10669

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Meet Face ID and Touch ID for the web

https://developer.apple.com/wwdc20/10670

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Architecting for subscriptions

https://developer.apple.com/wwdc20/10671

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in ClassKit

https://developer.apple.com/wwdc20/10672

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore Computer Vision APIs

https://developer.apple.com/wwdc20/10673

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build trust through better privacy

https://developer.apple.com/wwdc20/10676

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build customized ML models with the Metal Performance Shaders Graph

https://developer.apple.com/wwdc20/10677

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Refine Objective-C frameworks for Swift

https://developer.apple.com/wwdc20/10680

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Explore the new system architecture of Apple Silicon Macs

https://developer.apple.com/wwdc20/10686

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Triage test failures with XCTIssue

https://developer.apple.com/wwdc20/10687

Presenters: Example Guy, Another Person

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

展开

WWDC

WWDC 2020会话说明

谢谢 ？

简介

贡献

提及

有趣的与WWDC相关的链接

目录

使用App Store Connect API扩展自动化

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

评估的新功能

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

引入汽车钥匙

优化视频应用程序的核心图像管道

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

编辑和播放使用Avfoundation的HDR视频

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

带有Avoundation的应用中的HDR媒体导出HDR媒体

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

作者与AvassetWriter的碎片MPEG-4内容

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

发现射线用金属跟踪

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

了解金属功能指针

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

核心数据：杂物和格言

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

开关控制的应用程序可访问性

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

使您的应用在视觉上访问

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

用Xcode构建基于金属的核心图像内核

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

在您的应用程序中创建无缝的语音体验

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

uicollectionView中的列表

现代细胞配置

认识widgetkit

Swiftui中的堆栈，网格和轮廓

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

为小部件构建Swiftui视图

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

小部件代码，第1部分：冒险开始

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

小部件代码，第2部分：替代时间表

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

小部件代码，第3部分：前进时间表

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

Swiftui的应用必需品

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

在Swiftui中构建基于文档的应用程序

待办事项！您可以为本届会议做出贡献，请参阅parduting.md

Swiftui中的数据必需品

Swiftui的新功能

Build SwiftUI apps for tvOS

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build an Action Classifier with Create ML

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Advances in diffable data sources

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Create complications for Apple Watch

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Enable encrypted DNS

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build complications in SwiftUI

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Keep your complications up to date

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Build with iOS pickers, menus and actions

Optimize the interface of your Mac Catalyst app

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Identify trends with the Power and Performance API

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Design high quality Siri media interactions

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Expand your SiriKit Media Intents to more platforms

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

Background execution demystified

TO-DO! You can contribute to this session, please see CONTRIBUTING.md

What's new in SiriKit and Shortcuts

谢谢？