swift之在代码中实现 NSTimer之Swift

我在代码中使用/实现 NSTimer 时遇到了一些麻烦。到目前为止，我有这个:

//Delay function from http://stackoverflow.com/questions/24034544/dispatch-after-gcd-in-swift/24318861#24318861 
func delay(delay:Double, closure:()->()) { 
    dispatch_after( 
        //adds block for execution at a specific time 
        dispatch_time( 
            //creates a dispatch time relative to default clock 
            DISPATCH_TIME_NOW, 
            //Indicates that something needs to happen imediately 
            Int64(delay * Double(NSEC_PER_SEC)) 
            //a 64bit decleration that holds the delay time times by the amount of nanoseconds in one seconds, inorder to turn the 'delay' input into seconds format 
        ), 
        dispatch_get_main_queue(), closure) 
} 
 
 
@IBAction func computerTurn(){ 
 
    if(isFirstLevel){levelLabel.text = ("Level 1"); isFirstLevel = false} 
    else{ level++ } 
 
    var gameOrderCopy = gameOrder 
    var randomNumber = Int(arc4random_uniform(4)) 
    gameOrder.append(randomNumber) 
    var i = 0 
    var delayTime = Double(1) 
 
    println(Double(NSEC_PER_SEC)) 
    for number in self.gameOrder{ 
 
 
        if number == 0{ 
            delay(delayTime++){self.greenButton.highlighted = true} 
            self.delay(delayTime++){ 
                self.greenButton.highlighted = false 
            } 
        } 
 
        else if number == 1{ 
            delay(delayTime++){self.redButton.highlighted = true} 
             self.delay(delayTime++){ 
                self.redButton.highlighted = false 
            } 
 
        } 
 
        else if number == 2{ 
            delay(delayTime++){self.yellowButton.highlighted = true} 
             self.delay(delayTime++){ 
                self.yellowButton.highlighted = false 
            } 
        } 
        else if number == 3{ 
            delay(delayTime++){self.blueButton.highlighted = true} 
             self.delay(delayTime++){ 
                self.blueButton.highlighted = false 
            } 
        } 
        println(delayTime) 
 
 
    } 
} 

我需要做的是替换定时器功能，或摆脱它，并执行与此处发生的相同的操作，但使用 NSTimer。

谢谢

请您参考如下方法:

NSTimer 在此上下文中可能有点笨拙，因为它需要使用目标操作或 NSInvocation。但是，NSTimer 是免费桥接 CFRunLoopTimer 的，您可以使用 block 调用它:

func delay(delay:Double, closure:()->()) { 
    let fireDate = delay + CFAbsoluteTimeGetCurrent() 
    let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, 0, 0, 0) { _ in 
        closure() 
    } 
    CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes) 
}