定时器只执行一次函数

Question

所以定时器只工作一次，但在第一次后它不再工作了......这是什么问题，它如何被修复？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

试试这个代码：

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：