Question

我正在尝试使用SpriteKit为游戏创建一个倒数计时器，但每当我尝试运行countDown（）时，我的游戏就会冻结。我很确定我的逻辑在这里是正确的。我不知道发生了什么。

func countDown(){
    let countDownWait = SKAction.wait(forDuration: 1.0)
        repeat {
            self.run(countDownWait){
                self.countDownTime -= 1
            }
        } while (self.countDownTime > 0)

        if self.countDownTime == 0{
            self.runGameOver()
        }
}

Answer 1

您可以在更新功能中检查一段时间，或者使用SKAction跟踪您在代码中执行的操作时间

let someLabel = SKLabelNode()

func countdown() {

    var offset: Double = 0

    for x in (0...10).reversed() {

        run(SKAction.wait(forDuration: offset)) {
            someLabel.text = "\(x)"

            if x == 0 {
                //do something when counter hits 0
                //self.runGameOver()
            }
            else {
                 //maybe play some sound tick file here
            }
        }
        offset += 1.0
    }
}

Answer 2

以下是我为Swift / SpriteKit＆＃39; Breakout＆＃39;解决这个问题的方法。应用。我希望在主游戏屏幕上从5比1倒数，但在球开始移动之前。我添加了这些功能，然后在didMoveToView结束时调用倒计时（5）：注意ball.physicsBody!.applyImpulse(CGVectorMake(20, 20))是endCountdown的最后一步，它启动球并有效地开始游戏。

func countdown(count: Int) {
    countdownLabel.horizontalAlignmentMode = .Center
    countdownLabel.verticalAlignmentMode = .Baseline
    countdownLabel.position = CGPoint(x: size.width/2, y: size.height*(1/3))
    countdownLabel.fontColor = SKColor.whiteColor()
    countdownLabel.fontSize = size.height / 30
    countdownLabel.zPosition = 100
    countdownLabel.text = "Launching ball in \(count)..."

addChild(countdownLabel)

let counterDecrement = SKAction.sequence([SKAction.waitForDuration(1.0),
    SKAction.runBlock(countdownAction)])

runAction(SKAction.sequence([SKAction.repeatAction(counterDecrement, count: 5),
    SKAction.runBlock(endCountdown)]))

}

func countdownAction() {
    count--
    countdownLabel.text = "Launching ball in \(count)..."
}

func endCountdown() {
    countdownLabel.removeFromParent()
    ball.physicsBody!.applyImpulse(CGVectorMake(20, 20))
}

Answer 3

尝试使用此解决方案来运行倒计时...

 var seconds = 7200
  var timer = Timer()



override func viewDidLoad() {
        super.viewDidLoad() 
         runTimer()
}

  func runTimer() {
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(self.updateTimer)), userInfo: nil, repeats: true)

    }
    @objc func updateTimer() {
        if seconds < 1 {
            timer.invalidate()
            //Send alert to indicate time's up.
        } else {
            seconds -= 1
            timerLabel.text = timeString(time: TimeInterval(seconds))
        }
    }

    func timeString(time:TimeInterval) -> String {
        let hours = Int(time) / 3600
        let minutes = Int(time) / 60 % 60
        let seconds = Int(time) % 60
        return String(format:"%02i:%02i:%02i", hours, minutes, seconds)
    }

Answer 4

你考虑过使用计时器吗？ Here is a good tutorial。它可能需要20分钟才能完成它，但它会详细介绍启动，停止，暂停以及更多计时器。

快速倒计时功能

4 个答案: