override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.                Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.timerAction(_:)), userInfo: "Apple", repeats: true)    }        @objc func timerAction(_ timer:Timer) {        let parameter = timer.userInfo        print("I am eating \(parameter!).")    }