Swift: how to invalidate timer on animated SKShapenode countdown? - swift

Question

Alright I'm building a sprite kit game and on one of my previous questions, I got the code that lets a circle skshapenode "unwind" in accordance with a timer that runs out (so that the circle has disappeared by the time the timer is done).
Here was my question: Swift, sprite kit game: Have circle disappear in clockwise manner? On timer?
And here is the code that I've been using:
func addCircle() {
circle = SKShapeNode(circleOfRadius: 50)
let circleColor = UIColor(red: 102/255, green: 204/255, blue: 255/255, alpha: 1)
circle.fillColor = circleColor
circle.strokeColor = SKColor.clearColor()
circle.position = CGPoint (x: self.frame.size.width * 0.5, y: self.frame.size.height * 0.5+45)
circle.zPosition = 200
circle.zRotation = CGFloat(M_PI_2)
addChild(circle)
countdown(circle, steps: 120, duration: 5) { //change steps to change how much of the circle it takes away at a time
//Performed when circle timer ends:
print("circle done")
self.gameSoundTrack.stop()
self.removeAllChildren()
self.removeAllActions()
self.viewController.removeSaveMe(self)
self.GOSceneNodes() //Implements GOScene
self.viewController.addGOScene(self) //Implements GOViewController
}
}
// Creates an animated countdown timer
func countdown(circle:SKShapeNode, steps:Int, duration:NSTimeInterval, completion:()->Void) {
let radius = CGPathGetBoundingBox(circle.path).width/2
let timeInterval = duration/NSTimeInterval(steps)
let incr = 1 / CGFloat(steps)
var percent = CGFloat(1.0)
let animate = SKAction.runBlock({
percent -= incr
circle.path = self.circle(radius, percent:percent)
})
let wait = SKAction.waitForDuration(timeInterval)
let action = SKAction.sequence([wait, animate])
runAction(SKAction.repeatAction(action,count:steps-1)) {
self.runAction(SKAction.waitForDuration(timeInterval)) {
circle.path = nil
completion()
}
}
}
// Creates a CGPath in the shape of a pie with slices missing
func circle(radius:CGFloat, percent:CGFloat) -> CGPath {
let start:CGFloat = 0
let end = CGFloat(M_PI*2) * percent
let center = CGPointZero
let bezierPath = UIBezierPath()
bezierPath.moveToPoint(center)
bezierPath.addArcWithCenter(center, radius: radius, startAngle: start, endAngle: end, clockwise: true)
bezierPath.addLineToPoint(center)
return bezierPath.CGPath
}
This all works well, however I need a way to invalidate the countdown for the circle if another button within the game is pressed so that everything that is performed when the timer runs out (everything after //Performed when circle timer ends: above) is NOT performed.
I have tried
circle.removeAllActions()
circle.removeFromParent()
when the button is pressed, however this just removes the circle and everything is still executed even though the circle is gone.
I'm pretty new to Swift and I can't figure out what part of those 3 functions I need to invalidate or stop in order to stop the countdown from finishing. How can I accomplish this?

Answer 1

You can stop an action by adding a key to the action and then run
removeActionForKey("actionKey")
To add a key to the action, replace the countdown method with the following:
// Creates an animated countdown timer
func countdown(circle:SKShapeNode, steps:Int, duration:NSTimeInterval, completion:()->Void) {
let radius = CGPathGetBoundingBox(circle.path).width/2
let timeInterval = duration/NSTimeInterval(steps)
let incr = 1 / CGFloat(steps)
var percent = CGFloat(1.0)
let animate = SKAction.runBlock({
percent -= incr
circle.path = self.circle(radius, percent:percent)
})
let wait = SKAction.waitForDuration(timeInterval)
let action = SKAction.sequence([wait, animate])
let completed = SKAction.runBlock{
circle.path = nil
completion()
}
let countDown = SKAction.repeatAction(action,count:steps-1)
let sequence = SKAction.sequence([countDown, SKAction.waitForDuration(timeInterval),completed])
runAction(sequence, withKey: "actionKey")
}