didReceiveRemoteNotification调用了两次

Question

我在我的应用程序中实现了推送通知.

当我的应用程序在前台时,我的应用程序正常工作.

但当应用程序在后台或被杀时,我的didReceiveRemoteNotification被叫两次.

我已经提出了一个处理Push通知并从didFinishLaunchingWithOptions和 调用此方法的常用方法didReceiveRemoteNotification

这是我的实施:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  NSDictionary *pushDictionary = [launchOptions valueForKey:UIApplicationLaunchOptionsRemoteNotificationKey];
  if (pushDictionary) {
    [self customPushHandler:pushDictionary];
  }

  return YES;

}

而且:

- (void)application:(UIApplication *)application
   didReceiveRemoteNotification:(NSDictionary *)userInfo
  fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))handler {


         [self customPushHandler:userInfo];

 }

和:

 - (void) customPushHandler:(NSDictionary *)notification {

     // Code to push ViewController

         NSLog(@"Push Notification"); //Got it two times when Clicked in notification banner

   }

当我的应用程序运行时,ViewController被推送一次.当我打开我的应用程序从通知横幅,然后我的屏幕被推了两次.

我放置了一个NSLog,customPushHandler当App处于前台时,我得到了一次,当我从Notification banner中启动时,我得到了两次.

我的代码中有什么问题.

Answer 1

“当应用程序在后台时，该方法会被调用两次，一次是在您收到推送通知时，另一次是在您点击该通知时。 ”

如果应用程序在后台，您可以验证应用程序状态并忽略收到的通知。

解决方法：远程通知方法调用两次

斯威夫特 4 代码：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

        if (application.applicationState == .background) {
            completionHandler(.noData)
            return
        }

    // logic
    // call completionHandler with appropriate UIBackgroundFetchResult
}

Answer 2

检查didReceiveRemoteNotification中的这一条件，就像您在应用程序处于后台时点击通知一样。这样，您就可以避免被两次呼叫。

 - (void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))handler {
      UIApplicationState state = [[UIApplication sharedApplication] applicationState];
      if (state == UIApplicationStateBackground || state == UIApplicationStateInactive || state == UIApplicationStateForeground || state == UIApplicationStateActive)
      {
          //Do checking here.
          [self customPushHandler:userInfo];
      }
}

检查我是否已编辑我的答案。