爲什麼沒有計時器調用選擇器？

Question

func countDownForGetVerify(sender: NSTimer) { 
    verifyBtn.setTitle("(\(Int(kVerityTime))s)", forState: .Disabled) 
    kVerityTime-- 
    if kVerityTime == 0 { 
     stopCountDown() 
    } 
} 

private func startCountDown() { 
    timer.fireDate = NSDate.distantPast() 
} 

private func stopCountDown() { 
    kVerityTime = 60 
    timer.fireDate = NSDate.distantFuture() 
    verifyBtn.enabled = true 
} 


// MARK: - Lazy initial 
private var timer: NSTimer { 
    get { 
     return NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "countDownForGetVerify", userInfo: nil, repeats: true) 
    } 
} 

Answer 1

，因爲有一個尾隨結腸缺失（表示參數）

"countDownForGetVerify:" 

Answer 2

每當ü寫任何選擇器，在端指定結腸總是 所以與此替換此線

"NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "countDownForGetVerify", userInfo: nil, repeats: true) 

NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "countDownForGetVerify:", userInfo: nil, repeats: true)