应用程序终止时的 Swift IOS 启动通知

Question

I would like to send a notification when my app is terminated. Is this possible using background processes to send a message as the app is killed? I'm using swift.

Thanks, Rob.

Answer 1

No. If your app is backgrounded, it is suspended. It is not running. If it is now terminated, it doesn't get brought back to a running state and sent a message of some sort. It just dies silently in its sleep.

Answer 2

you can use this function in your AppDelegate

func applicationWillTerminate(_ application: UIApplication) {
        bgTask = application.beginBackgroundTask(withName:"appWillEnd", expirationHandler: {() -> Void in
            // Do something to stop our background task or the app will be killed

        })

        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }

I hope that you can use it

Answer 3

The best you can reasonably hope for is to have the OS tell you when the user is leaving the app. Eg you can implement applicationDidEnterBackground(_:) or applicationWillResignActive(_:) (or if using iOS 13 scene delegate, implement sceneDidEnterBackground(_:) or sceneWillResignActive(_:) ).

For more information, see Preparing Your UI to Run in the Background or About the Background Execution Sequence .