错误 – 线程1：信号SIGABRT（无法识别的选择器发送到实例）

我正在创建一个应用程序，您需要指明标签显示的时间量，并在页面底部对该时间进行倒计时。

当我在Xcode模拟器上运行我的应用程序时， chronometre标签显示“可选（*指示数字）”，当我希望它只显示指定的数字时。 一旦它显示一秒钟，我就会被带到我的应用代表处，它说Thread 1: signal SIGABRT 。

还会显示以下错误： 2015-02-22 21:05:50.860 MemoPres.New[71008:12980314] -[MemoPres_New.ViewController subtractTime:]: unrecognized selector sent to instance 0x7fbab24299c0 2015-02-22 21:05:50.862 MemoPres.New[71008:12980314] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MemoPres_New.ViewController subtractTime:]: unrecognized selector sent to instance 0x7fbab24299c0' 。

非常感谢帮助。

以下是我的所有代码：

 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)" } } } 

Answer 1

您需要在IBAction之外声明方法subtractTime（）。 这同样适用于您的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! 

//

  var timer = NSTimer() var startTime:NSTimeInterval = 0 var timeLeft:NSTimeInterval = 45 var isTimerON = false var isPaused = false 

//

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

//

  override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. timer = NSTimer.scheduledTimerWithTimeInterval(1/20, target: self, selector: "updateTimer", userInfo: nil, repeats: true) NSRunLoop.mainRunLoop().addTimer(timer, forMode: NSRunLoopCommonModes) } 

//

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

//

  @IBAction func pauseResumeAction(sender: AnyObject) { isPaused = !isPaused if isPaused { timeLeft = startTime - NSDate().timeIntervalSinceReferenceDate } startTime = NSDate().dateByAddingTimeInterval(timeLeft).timeIntervalSinceReferenceDate btnPauseResume.setTitle({return !self.isPaused ? "Pause":"Resume" }(), forState: UIControlState.Normal) } 

//

  @IBAction func startCancelAction(sender: AnyObject) { isTimerON = !isTimerON isPaused = false timeLeft = 45 startTime = isTimerON ? NSDate().dateByAddingTimeInterval(timeLeft).timeIntervalSinceReferenceDate : timeLeft btnStartCancel.setTitle({return !self.isTimerON ? "Start" : "Cancel"}(), forState: UIControlState.Normal) progressView.progress = 0 btnPauseResume.setTitle("Pause", forState: UIControlState.Normal) strTimer.text = "00:45" btnPauseResume.enabled = isTimerON ? true : false } } 

//

 extension NSTimeInterval { var time:String { return String(format:"%02d:%02d", Int((self/60.0)%60), Int((self) % 60 )) } }