IOS swift倒数计时器不会停止

Question

我正在尝试制作一个倒数计时器，它从 60 秒开始倒计时，然后在倒数到 0 时停止。但是计时器一直在倒计时。任何建议表示赞赏。代码:

@IBOutlet var timeCounter: UILabel!
var second = 60

var timer = NSTimer()

var timerRunning = true

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.


    setTimer()
    timerCounting()
 }

func setTimer(){
    second  -= 1
    timeCounter.text = "\(second)"


}

func timerCounting(){
    if(timerRunning == true){

        timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("setTimer"), userInfo: nil, repeats: true)
        timerRunning = true
        if second == 0 {
            timerRunning = false
            timer.invalidate()


        }


    }


}

Answer 1

您必须将失效移动到 setTimer 函数中，因为在它的当前位置将永远不会被触发，因为 timerCounting 仅在开始时被调用一次。

func setTimer(){
    second  -= 1
    timeCounter.text = "\(second)"
    if second == 0 {
        timerRunning = false
        timer.invalidate()
    }
}