處理 iOS 中的下游訊息

要接收通知，請實施 application:didReceiveRemoteNotification:fetchCompletionHandler:（或 iOS <8.0 的 application:didReceiveRemoteNotification:），並呼叫 GCMService:appDidReceiveMessage:message 以確認收到訊息給 GCM。

- (void)application:(UIApplication *)application
    didReceiveRemoteNotification:(NSDictionary *)userInfo {
  NSLog(@"Notification received: %@", userInfo);
  // This works only if the app started the GCM service
  [[GCMService sharedInstance] appDidReceiveMessage:userInfo];
  // Handle the received message
  // ...
}

- (void)application:(UIApplication *)application
    didReceiveRemoteNotification:(NSDictionary *)userInfo
    fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))handler {
  NSLog(@"Notification received: %@", userInfo);
  // This works only if the app started the GCM service
  [[GCMService sharedInstance] appDidReceiveMessage:userInfo];
  // Handle the received message
  // Invoke the completion handler passing the appropriate UIBackgroundFetchResult value
  // ...
}