ios - 当应用程序处于后台时无法删除通知

Question

您好，当我的应用程序位于后台并且静默推送到达时，我正在尝试从通知中心删除通知。如果应用程序位于前台或连接到调试器，它可以正常工作。

但是，当应用程序在后台运行时，它就不起作用。我在 didReceiveRemoteNotification 内的 removeDeliveredNotificationsWithIdentifiers 中使用。有什么建议吗？谢谢您

[center getDeliveredNotificationsWithCompletionHandler:^(NSArray<UNNotification *> * _Nonnull notifications) {

   for (UNNotification* notification in notifications) 
   {
         NSDictionary* ui = notification.request.content.userInfo;

         if ([ui[@"activityId"] isEqualToString:activityId]) 
         {            
             [center removeDeliveredNotificationsWithIdentifiers:@[notification.request.identifier]];
         }

    }
    completionHandler(UIBackgroundFetchResultNoData);                     
}]; 

Answer 1

尝试使用 UIApplicationState 属性。

示例:

  UIApplicationState* applicationState;
  if (applicationState == UIApplicationStateActive) {
    // Application is running in foreground
    //Handler 
   }
   else if (applicationState == UIApplicationStateBackground || applicationState == UIApplicationStateInactive) {
   // Application is brought from background or launched after terminated
   // Handler 
   }