Swift 5 App im Hintergrund erkennen (app moved to background)

Mit diesen Codzeilen kann man erkennen, ob eine App in den Hintergund geschoben wird.

 override func viewDidLoad() {
        super.viewDidLoad()

        let notificationCenter = NotificationCenter.default
        notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.didEnterBackgroundNotification, object: nil)

    }

    @objc func appMovedToBackground() {
        print ("App moved to Background")
    }