如何确定iOS设备是否连接到台式电脑（和iTunes）
有没有办法确定 iOS 设备是否使用 USB 线连接到台式电脑并且在 iTunes 上列出。
Is there way to determine whether an iOS device is connected to a desktop computer using USB cable and it is listed on iTunes.
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是的，您可以使用外部通知此类事件附件框架。
“每当连接或断开硬件附件时，它都能够发送通知。虽然它有能力，但它不会自动执行此操作。您的应用程序必须明确请求通过调用生成通知这
EAAccessoryManager类的 registerForLocalNotifications 方法 当附件已连接、经过身份验证并准备好与您的应用程序交互时，框架会在附件断开连接时发送EAAccessoryDidConnectNotification通知。它会发送EAAccessoryDidDisconnectNotification通知，您可以使用默认的NSNotificationCenter注册接收这些通知，并且这两个通知都包含有关哪个配件受到影响的信息。”Yes you can be notified of such events using The External Accessory framework.
"It is capable of sending notifications whenever a hardware accessory is connected or disconnected. Although it is capable, it does not do so automatically. Your application must specifically request that notifications be generated by calling the registerForLocalNotifications method of the
EAAccessoryManagerclass. When an accessory is connected, authenticated, and ready to interact with your application, the framework sends anEAAccessoryDidConnectNotificationnotification. When an accessory is disconnected, it sends anEAAccessoryDidDisconnectNotificationnotification. You can register to receive these notifications using the defaultNSNotificationCenter, and both notifications include information about which accessory was affected."