如果应用程序进入后台，如何运行计时器？

Question

I try to run a Function in SceneDelegate.swift if the App goes to Background.

if the App entering the Background the Timer Stops. if have added the Background Modes and select the Background Processing.

but timer stops everytime!

func runtimerAction(){
    Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { timer in
        print("Timer fired!")
    }
}


func sceneDidEnterBackground(_ scene: UIScene) {

    runtimerAction()

    (UIApplication.shared.delegate as? AppDelegate)?.saveContext()
}

Answer 1

As per Apple's restrictions your app need background mode to do anything in background and even then you still can't run a timer on background.

If you need a counter to check how much time has passed since X can save the time (IE: Date() ) and then check against the saved time to see how much time has passed since app last went to background.