objective-c - iOS9 NSDefaultRunLoopMode 不听 didRegisterForRemoteNotificationsWithDeviceToken 委托

Question

在 iOS 9 中

[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:timeoutDate];

不听didRegisterForRemoteNotificationsWithDeviceToken或didFailToRegisterForRemoteNotificationsWithError委托，但它听applicationDidEnterBackground和其他UIApplication委托。它在 iOS 7 和 iOS 8 上运行良好。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];
   [[UIApplication sharedApplication] registerForRemoteNotifications];

   dispatch_async(dispatch_get_main_queue(), ^{
        [self waitForCompletion:30];
   });
  return YES;
}

- (bool)waitForCompletion:(NSTimeInterval)timeoutSecs {
   NSDate *timeoutDate = [NSDate dateWithTimeIntervalSinceNow:timeoutSecs];
   do {
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:timeoutDate];
    if ([timeoutDate timeIntervalSinceNow] < 0.0)
        break;
   } while (!_done);
   return _done;
}

- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken {
   // send device token to server
   _done = true;
}

application:didRegisterForRemoteNotificationsWithDeviceToken总是在 30 秒后调用（超时值）。