Swift - Timer倒數遊戲

Question

我已經在網上看了許多不同的'定時器'教程，但他們過於複雜的東西，如背景e.t.c.我想要的是在屏幕頂部倒數'3，2，1，播放'的計時器。我將有圖像而不是文字。只要點擊觸摸開始按鈕（我已經完成），該定時器就會被激活。任何幫助你可以給我在Apple Swift上做到這一點將非常感激。

Answer 1

你從NSTimer

// IBOutlet From Storyboard 
@IBOutlet weak var imgView: UIImageView! 

var countdown : Int! = 0 // Variable to check the count down seconds 

override func viewDidLoad() { 
     // Scheduling timer to Call the function **Countdown** with the interval of 1 seconds 
     NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("countDown:"), userInfo: nil, repeats: true) 
} 

func countDown(timer: NSTimer) { 
    countdown = countdown + 1 
    if (countdown == 1) {  // second 1, show image 3 
     imgView.image = UIImage(named: "three.png") 
    } 
    else if (countdown == 2) { // second 2, show image 2 
     imgView.image = UIImage(named: "two.png") 
    } 
    else if (countdown == 3) { // second 3, show image 1 
     imgView.image = UIImage(named: "one.png") 
    } 
    else if (countdown == 4) { // second 4, show image 'play' 
     imgView.image = UIImage(named: "play.png")    
    } 
    else { 
    // Invalidate the timer & remove the `time image` and continue with your `gameplay` 
     imgView.removeFromSuperview() 
     timer.invalidate() 
    } 
}