Swift Countdown Function - swift

Question

I am attempting to create a countdown timer for a game using SpriteKit, but whenever I try to run countDown(), my game freezes. I am pretty sure my logic is correct here. I do not know what is going on.
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

you can do some checking in the update func for time passed or use a SKAction to track time similar to what you were doing in your code
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

Here's how I solved this problem for my Swift/SpriteKit 'Breakout' application. I wanted a countdown from 5 to 1 onthe main game screen but before the ball started to move. I Added these functions and then a call to countdown(5) at the end of didMoveToView: Notice the ball.physicsBody!.applyImpulse(CGVectorMake(20, 20)) as the last step of endCountdownwhich starts the ball and effectively starts the game.
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

Try this solution to run countdown...
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

Have you considered using a timer? Here is a good tutorial. It might take you 20 minutes to go through it or so, but it goes into detail about starting, stopping, pausing, and more for timers.