iOS推送通知 - didReceiveRemoteNotification：fetchCompletionHandler：从未在前台调用

Question

我在我的应用程序中实现了远程通知，但是我遇到了didReceiveRemoteNotification:fetchCompletionHandler:的问题。

当手机屏幕锁定时，我收到通知。如果用户滑动通知，则应用程序会回到前台并调用didReceiveRemoteNotification:fetchCompletionHandler:。

但是，如果应用程序在前台运行，则永远不会调用didReceiveRemoteNotification:fetchCompletionHandler:。可能是什么原因？

我正在使用iOS 10.3.2

Answer 1

您正在使用哪个iOS版本？

有适用于iOS 9和iOS不同的方法10.

下面是iOS的10

//Called when a notification is delivered to a foreground app. 
    @available(iOS 10.0, *) 
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) { 

    } 


    //Called to let your app know which action was selected by the user for a given notification. 
    @available(iOS 10.0, *) 
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping() -> Void) { 

    } 

的那些对于iOS 9，一定要注册您的通知， didBecomeActive

UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.sound, .alert, .badge], categories: nil)) 
UIApplication.shared.registerForRemoteNotifications() 

，并在您didReceiveRemoteNotification

func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable : Any]) { 

if application.applicationState == .active { 
//foreground state 
} 

} 

最好的办法是把一个调试器didReceiveRemoteNotification和进一步检查。