"此枚举类型描述了应用程序在 iOS 后台运行时可以执行的各种操作。这些值是标志，这意味着它们可以用 | 运算符进行组合。
| None | 不需要后台模式。 |
| AudioAirplayPiP | 应用程序在后台播放或录制音频。 |
| LocationUpdates | 应用程序向用户发送有关其位置信息的通知。 |
| VoiceOverIP | 应用程序提供 IP 语音功能。 |
| NewsstandDownloads | 应用程序下载报亭内容。 |
| ExternalAccessoryCommunication | 应用程序与外部硬件配件进行通信。 |
| UsesBluetoothLEAccessory | 应用程序与蓝牙配件配合使用。 |
| ActsAsABluetoothLEAccessory | 应用程序充当蓝牙配件。 |
| BackgroundFetch | 应用程序定期下载少量数据。 |
| RemoteNotifications | 当推送通知及时送达时，应用程序需要下载内容。 |
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