Question

我已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，我的应用程序运行正常。

但是当应用程序在后台或被杀时，我的didReceiveRemoteNotification会被调用两次。

我已经提出了一种处理推送通知并从didFinishLaunchingWithOptions和didReceiveRemoteNotification

调用此方法的常用方法

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;

}

并且：

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


         [self customPushHandler:userInfo];

 }

并

 - (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。

我在customPushHandler放置了一个NSLog，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

“ 当应用程序在后台运行时，该方法被调用两次，一次是在收到推送通知时，另一次是在您点击该通知时。”

您可以验证应用程序的状态，如果应用程序处于后台，则可以忽略收到的通知。

解决方案：Remote notification method called twice

快速4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，例如如果您在app处于后台时点击通知。通过这种方式，您可以避免被调用两次。

 - (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];
      }
}

检查我编辑了我的答案。

Answer 3

检查当前导航堆栈中的顶视图控制器，如：

if(![self.navigationController.topViewController isKindOfClass:[MyClass class]]) {

           //code for pushing new controller

 }

Answer 4

每当您使用backgroundFetch进行远程通知时，请为其添加完成处理程序。

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

    [self customPushHandler:userInfo];

    completionHandler(UIBackgroundFetchResultNewData)
}

didReceiveRemoteNotification调用了两次

4 个答案: