1.General
Known Issues
Important
Updating to iOS & iPadOS 14 from previous versions of iOS & iPadOS might take significantly longer than expected. Data loss could occur if the update is interrupted. (59101197)
macOS Big Sur 11 beta 6 or Xcode 12 might be required to sync or update devices running iOS & iPadOS 14 or later.
macOS Big Sur 11 beta 6 is required to use the restore images for iOS & iPadOS 14 or later.
总体，已知问题，重要
从以前版本的iOS和iPadOS更新到iOS和iPadOS 14可能需要比预期更长的时间。如果更新中断，可能会丢失数据。
2.App Clips
New Features
You can now use Settings > Developer Settings to test an App Clip card. (64787288)
应用程序剪辑，新功能
现在可以使用“设置”>“开发人员设置”来测试应用程序剪辑卡片
3.App Store
Known Issues
Avoid calling the presentCodeRedemptionSheet() API until you’re able to create supported codes. (59351258)
New Features
SKOverlay enables downloading an app without having to leave the current app. The overlay can also be tapped to view the app in the App Store. In an App Clip, SKOverlay enables users to download the corresponding full app from within the App Clip. (56886149)
You can now manage subscriptions, test upgrades, downgrades, and cancellations, as well as reset the introductory offer eligibility for a test account, by tapping on your sandbox account in Settings. (57248908)
The userInfo parameter can now be passed to Account Authentication Modification Extensions during in-app upgrades. (64128404)
应用商城，已知问题
在能够创建支持码之前，请避免调用presentCodeRedemptionSheet（）API
新特性
SKOverlay可以在不离开当前应用程序的情况下下载应用程序。该覆盖层也可以点击来查看应用程序商店中的应用程序。在应用程序剪辑中，SKOverlay允许用户从应用程序剪辑中下载相应的完整应用程序。
您现在可以管理订阅、测试升级、降级和取消，还可以通过在“设置”中点击沙盒帐户来重置测试帐户的入门级优惠资格
userInfo参数现在可以在应用内升级期间传递给帐户身份验证修改扩展
4.AVFoundation
New Features
A new feature in AVAudioSession allows clients to request stereo polar patterns from the built-in mic. Clients choosing a stereo polar pattern must call a new method of AVAudioSession to specify the stereo input orientation. For more information, see AVAudioSession (58584572)
AVFoundation框架，新特性
avaudiossession中的一个新功能允许客户从内置麦克风请求立体声拾音模式。选择立体声极性模式的客户必须调用一个新的AVAudioSession方法来指定立体声输入方向。有关详细信息，请参阅AVAudioSession文档
5.Core Haptics
Known Issues
CHHapticEngine vended through the Game Controller framework (GCDeviceHaptics) don’t support CHHapticAdvancedPatternPlayer and an error is returned on advanced player creation.
audioCustom and audioContinuous events sent to CHHapticEngine vended through the Game Controller framework (GCDeviceHaptics) are silently ignored. (65163373)
The creation of CHHapticEngine via class initializers is available only in iOS. For other platforms, access these engines via GCController
播放震动，已知问题
通过游戏控制器框架（GCDeviceHaptics）出售的CHHapticEngine不支持CHHapticAdvancedPatternPlayer，并且在创建高级玩家时返回错误。
通过游戏控制器框架（GCDeviceHaptics）发送到CHHapticEngine的audioCustom和audioContinuous事件将被静默忽略
通过类初始化器创建chhapticeengine只在iOS中可用。对于其他平台，通过GCController访问这些引擎
