Ios 错误-线程1：信号SIGABRT（无法识别的选择器发送到实例）

我正在制作一个应用程序，在这个应用程序中，你需要指出标签出现的时间长度，并在页面底部倒计时

当我在Xcode模拟器上运行我的应用程序时，

Chronometer

标签显示“可选（*指示数字）”，而我希望它只显示指示数字。一旦它显示了一秒钟，我就会被带到我的应用程序代理那里，它说

线程1:SIGABRT

还显示了以下错误：

2015-02-22 21:05:50.860 MemoPres.New[71008:12980314]-[MemoPres_New.ViewController subtractTime:]：未识别的选择器发送到实例0x7fbab24299c0
2015-02-22 21:05:50.862 MemoPres.New[71008:12980314]***由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'-[MemoPres_New.ViewController subtractTime::]：未识别的选择器发送到实例0x7fbab24299c0'

非常感谢您的帮助

以下是我的全部代码：

class ViewController: UIViewController {


@IBOutlet weak var chronometre: UILabel!
@IBOutlet weak var prochainpointLabel: UILabel!
@IBOutlet weak var pointactuelLabel: UILabel!
@IBOutlet weak var point1Textfield: UITextField!
@IBOutlet weak var point1tempsTextfield: UITextField!
@IBOutlet weak var point2Textfield: UITextField!
@IBOutlet weak var point2tempsTextfield: UITextField!


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

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func presenterButton(sender: AnyObject) {

    var timer = NSTimer()
    var seconds = point1tempsTextfield.text.toInt()

    pointactuelLabel.text = point1Textfield.text
    prochainpointLabel.text = point2Textfield.text
    chronometre.text = "\(seconds)"



        timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: ("subtractTime:"), userInfo: nil, repeats: true)



    func subtractTime(dt:NSTimer){
        seconds!--
        chronometre.text = "\(seconds)"

    }


        }
}

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您需要在iAction之外声明方法subtractTime（）。这同样适用于计时器和第二个变量

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var progressView: UIProgressView!
    @IBOutlet weak var strTimer: UILabel!
    @IBOutlet weak var btnStartCancel: UIButton!
    @IBOutlet weak var btnPauseResume: UIButton!

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我将函数和计时器变量直接移动到

presenterButton

函数上方。但是现在它说

func presenterButton

不能是iAction，因为只有实例方法可以声明为“iAction”。此外，无论在

subtractTime

函数中提到

秒数

，它都表示

使用未解析标识符“秒数”

。你知道如何解决这些问题吗？我不会创建计时器来计算时间。你想让我给你看一段显示如何创建计时器的代码吗？我可以，但我不会尝试修复已经以错误方式启动的东西。是的，那太好了@达布斯

    var timer = Timer()
    var startTime: TimeInterval = 0
    var timeLeft: TimeInterval = 45
    var isTimerON = false
    var isPaused = false

    func updateTimer() {
        if isTimerON && !isPaused {
            strTimer.text = (startTime - Date().timeIntervalSinceReferenceDate).time
            progressView.progress = (1 - Float(startTime - Date().timeIntervalSinceReferenceDate) / 45)
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        timer = .scheduledTimerWithTimeInterval(1/20, target: self, selector: "updateTimer", userInfo: nil, repeats: true)
        RunLoop.main.addTimer(timer, forMode: .common)
    }

    @IBAction func pauseResumeAction(_ sender: Any) {
        isPaused = !isPaused
        if isPaused {
            timeLeft = startTime - Date().timeIntervalSinceReferenceDate
        }
        startTime = Date().dateByAddingTimeInterval(timeLeft).timeIntervalSinceReferenceDate
        btnPauseResume.setTitle( !isPaused ? "Pause" : "Resume", forState: .normal)
    }

    @IBAction func startCancelAction(_ sender: Any) {
        isTimerON = !isTimerON
        isPaused = false
        timeLeft = 45

        startTime = isTimerON ? Date().dateByAddingTimeInterval(timeLeft).timeIntervalSinceReferenceDate : timeLeft
        btnStartCancel.setTitle(!isTimerON ? "Start" : "Cancel",  forState: .normal)
        progressView.progress = 0
        btnPauseResume.setTitle("Pause",  forState: .normal)
        strTimer.text = "00:45"
        btnPauseResume.enabled = isTimerON
    }
}

extension TimeInterval {
    var time: String {
        String(format: "%02d:%02d", Int((self/60)%60), Int(self%60))
    }
}