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[英]Swift NSTimer unrecognized selector sent to instance timerFireMethod
[英]Unrecognized selector sent to instance NSTimer Swift
我正在嘗試開發一個包含簡單秒表功能的應用程序。 我正在使用Xcode 6和Swift語言。 這是FirstViewController中的代碼
@IBAction func Stopwatch (Sender:UIButton) {
var startTime = NSTimeInterval()
func updateTime(timer:NSTimer) {
//Find Current TIme
var currentTime = NSDate.timeIntervalSinceReferenceDate()
//Find the difference between current time and start time
var elapsedTime :NSTimeInterval = currentTime - startTime
//calculate the minutes in elapsed time.
let minutes = UInt(elapsedTime / 60.0)
elapsedTime -= (NSTimeInterval(minutes) * 60)
//calculate the seconds in elapsed time.
let seconds = UInt(elapsedTime)
elapsedTime -= NSTimeInterval(seconds)
//find out the fraction of milliseconds to be displayed.
let hours = UInt(elapsedTime * 100)
let strMinutes = minutes > 9 ? String(minutes):String(minutes)
let strSeconds = seconds > 9 ? String(seconds):String(seconds)
let strHours = hours > 9 ? String(hours):String(hours)
//assign text to Label
elapsedTimeLabel.text = "You have slept for \(strHours)"
}
//Timer
var timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: Selector("updateTime:"), userInfo: nil, repeats: true)
startTime = NSDate.timeIntervalSinceReferenceDate()
}
}
每次我運行應用程序(在iOS模擬器中)時,按下按鈕時應用程序崩潰(執行秒表功能)。 錯誤總是讀取
2014-11-23 11:44:53.617 Sleep[9630:644637] -[Sleep.FirstViewController updateTime:]:
unrecognized selector sent to instance 0x7ff6d9676e80
2014-11-23 11:44:53.622 Sleep[9630:644637] *** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[Sleep.FirstViewController updateTime:]: unrecognized
selector sent to instance 0x7ff6d9676e80'
*** First throw call stack:
我不知道為什么會這樣,我對iOS編程很新,所以請幫忙!
讓updateTime成為一個類方法。
如果它是一個純粹的Swift類,你需要在@objc前面說明該方法的聲明,如:
class A {
@objc func updateTime(timer:NSTimer) {
}
}
您已將updateTime
定義為Stopwatch
的本地函數,因此它不在其范圍之外。 您應該在課程級別(與Stopwatch
相同)移動它以便可以訪問。
但是我注意到有一些局部變量應該是實例屬性。
另一種可能性:確保你的選擇器函數沒有throw
,因為這也會給你一個無法識別的選擇器異常:
func mySelector(timer: NSTimer) throws {
}
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