当我调用内部带有 NSTimer 的函数时出现 NSException 错误

Question

嘿，我试图每 1 秒调用一个函数，但我不断收到以下错误：

terminating with uncaught exception of type NSException

这是我的代码，当我按下按钮时出现错误。

var startButton : UIButton!
var theTime = 0;
var countDownText = "hello"
var countDownTimer = NSTimer


startButton = UIButton(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height))
startButton.center = CGPointMake(view.frame.size.width / 2, view.frame.size.height/3)
startButton.setTitle("\(countDownText)", forState: UIControlState.Normal)
startButton.setTitleColor(UIColor.darkGrayColor(), forState: UIControlState.Normal)
startButton.addTarget(self, action: Selector("countDownFunc"), forControlEvents: UIControlEvents.TouchUpInside)
self.view?.addSubview(startButton)


func countDownFunc() {

    countDownTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("countDownFunc2:"), userInfo: nil, repeats: true)

}

func countDownFunc2(){
    theTime++
    countDownText = "HELLOOOOOOOOO"

}

print(theTime)

我不知道如何解决这个错误:( 任何帮助将不胜感激！！

Answer 1

您似乎在错误的范围内定义了方法。你好像有点像

func mySpecialFunc() {
    ...
    startButton.addTarget(self, action: Selector("countDownFunc"), forControlEvents: UIControlEvents.TouchUpInside)
self.view?.addSubview(startButton)

    func countDownFunc() {
        countDownTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("countDownFunc2:"), userInfo: nil, repeats: true)
    }

    func countDownFunc2(){
        theTime++
        countDownText = "HELLOOOOOOOOO"
    }

    print(theTime)

}

这意味着函数countDownFunc和countDownFunc2仅在mySpecialFunc的范围内定义和可用。您正在操作的 object/class 对此一无所知，因此您的计时器和动作选择器都失败了。您需要做的是将这两个方法移出 mySpecialFunc:

的主体

func mySpecialFunc() {
    ...
    startButton.addTarget(self, action: Selector("countDownFunc"), forControlEvents: UIControlEvents.TouchUpInside)
    self.view?.addSubview(startButton)

}   

func countDownFunc() {
    countDownTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("countDownFunc2"), userInfo: nil, repeats: true)
}

func countDownFunc2(){
    theTime++
    countDownText = "HELLOOOOOOOOO"
}

Answer 2

嘿看看this。

myButton.addTarget(self, action: "buttonTapped:", forControlEvents: .TouchUpInside)
let timer = NSTimer.scheduledTimerWithTimeInterval(timeInterval: 1, target: self, selector: "test", userInfo: nil, repeats: false)
// cit

他没用selector: Selector("method name")，他用selector: "method name"

当我调用内部带有 NSTimer 的函数时出现 NSException 错误

NSException errror when i call a function with a NSTimer inside

nstimer

swift