你的 didFailToRegisterForRemoteNotificationsWithError 方法没有被调用，因为注册没有失败——它甚至从未尝试过，因为用户拒绝了请求.

Your didFailToRegisterForRemoteNotificationsWithError method isn't called, because the registration didn't fail - it was never even attempted because the user denied the request.

在 iOS7 上，您可以执行以下操作:

On iOS7 you can do a couple of things:

1. 假设在调用 didRegisterForRemoteNotificationsWithDeviceToken 之前远程通知不可用
2. 检查 UIApplication 对象上的 enabledRemoteNotificationTypes 值

1. Assume that remote notifications aren't available until didRegisterForRemoteNotificationsWithDeviceToken is called
2. Check the value enabledRemoteNotificationTypes on the UIApplication object