APP在断网的时候也能接收到device token

*在第一次调用registerForRemoteNotificationTypes方法时没有联网,则既不会调用didRegisterForRemoteNotificationsWithDeviceToken,也不会调用didFailToRegisterForRemoteNotificationsWithError

*在第一次调用registerForRemoteNotificationTypes注册成功后,之后即使没有联网,再调用registerForRemoteNotificationTypes时都会以最上一次的device token作为参数回调didRegisterForRemoteNotificationsWithDeviceToken方法。

(官方描述) If your application has previously registered, calling registerForRemoteNotificationTypes: results in the operating system passing the device token to the delegate immediately without incurring additional overhead.

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