swift - 定时器只执行一次函数

Question

所以计时器只工作一次，但在第一次工作后就不再工作了......问题是什么？如何解决？谢谢!

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")

    }

Answer 1

试试这段代码:

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    Timer.scheduledTimer(timeInterval: 7.0, target: self, selector: #selector(functionOne), userInfo: nil, repeats: true)

}

func functionOne () { 
   print("hello") 
}

输出: