So the timer works once but after the first time it doesnt work anymore... What's the problem and how can it be fixed? Thanks!
override func viewDidLoad() {
        super.viewDidLoad()
 let myTimer : Timer = Timer.scheduledTimer(timeInterval: 7, target: self, selector: (selector: "functionOne"), userInfo: nil, repeats: true)
        }
    }
    func functionOne()
    {
       print("hello")
    }
 
     
    
