ios - 使用计时器更改 UILabel 的文本

Question

我想在一定时间后更改 UILabel 的文本。但在设定的时间后文本不会更改。我该如何解决这个问题？

查看我的代码:

var countDownText = "hello"

override func didMoveToView(view: SKView) {

startButton = UILabel(frame: CGRect(x: 0, y: 0, width: 300, height: 90))
    startButton.text = "\(countDownText)"
    startButton.center = CGPointMake(view.frame.size.width / 2, view.frame.size.height/2)
    startButton.textColor = UIColor.darkGrayColor()
    startButton.font = UIFont(name: "Arial", size: 20)
    startButton.textAlignment = NSTextAlignment.Center
    self.view?.addSubview(startButton)

countDownTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("countDownFunc"), userInfo: nil, repeats: true)

}

func countDownFunc(){
        theTime++

        if(theTime >= 4){
            countDownText = "testText"
        }

        if(theTime >= 8){
            spawnEnemys()
            startButton.removeFromSuperview()
            countDownTimer.invalidate()
        }
        print(theTime)

    }

在此先感谢您的所有帮助 :D

Answer 1

您的countDownFunc 应该是:

func countDownFunc(){
    theTime++

    if(theTime >= 4){
        countDownText = "testText"
        startButton.text = countDownText
    }

    if(theTime >= 8){
        spawnEnemys()
        startButton.removeFromSuperview()
        countDownTimer.invalidate()
    }
    print(theTime)

}