How to Properly Space SKSpriteNodes? - ios

Question

I'm working on a game where nodes are continuously scrolling down the screen. I have them set up to spawn at a certain position and everything looks even:
The issue occurs when the user pauses the game repeatedly, the nodes get misaligned like so:
I believe that when I pause the game my timing is thrown off. Here are my updateCurrentTime() functions. I have it set so it adds a new random row every 0.6 seconds.
func updateWithTimeSinceLastUpdate (_ timeSinceLastUpdate:CFTimeInterval) {
lastYieldTimeInterval += timeSinceLastUpdate
if lastYieldTimeInterval > 0.6 {
lastYieldTimeInterval = 0
addRandomRow()
}
}
override func update(_ currentTime: TimeInterval) {
if screenIsPaused == 1{
pauseScreen()
}else if screenIsPaused == 0{
unPauseScreen()
screenIsPaused = 2
} else if screenIsPaused == 3{
gameLayer.isPaused = true
}
var timeSinceLastUpdate = currentTime - lastUpdateTimeInterval
lastUpdateTimeInterval = currentTime
if timeSinceLastUpdate > 1 {
timeSinceLastUpdate = 1/60
lastUpdateTimeInterval = currentTime
}
updateWithTimeSinceLastUpdate(timeSinceLastUpdate)
}
Here is the code that I use to pause my game:
func pauseScreen(){
overlay.color = UIColor.black
overlay.alpha = 0.6
overlay.size.height = self.size.height
overlay.size.width = self.size.width
overlay.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)
overlay.zPosition = 100
addChild(overlay)
gameLayer.isPaused = true
screenIsPaused = 3
label.text = "Press screen to play!"
label.fontColor = SKColor.white
label.fontSize = 50
label.position = CGPoint(x: self.size.width / 2, y: self.size.height / 2)
addChild(label)
let Fade = SKAction.sequence([SKAction.fadeIn(withDuration: 1), SKAction.fadeOut(withDuration: 1)])
label.run(SKAction.repeatForever(Fade))
}
func unPauseScreen(){
label.removeFromParent()
overlay.removeFromParent()
screenIsPaused = 2
gameLayer.isPaused = false
}
The pause function is called in touchesEnded() and the un-pause function is called in touchesBegan.
Please let me know if there is anything I can try or if you require more information. Thanks!

Answer 1

I finally found a solution. I'm not sure if it is the best answer; however, it works. I modified my function updateWithTimeSinceLastUpdate here it is now:
func updateWithTimeSinceLastUpdate (_ timeSinceLastUpdate:CFTimeInterval) {
if lastYieldTimeInterval > 0.6 {
lastYieldTimeInterval = 0
addRandomRow()
}
if screenIsPaused == 1{
pauseScreen()
lastYieldTimeInterval += timeSinceLastUpdate
}else if screenIsPaused == 0{
unPauseScreen()
lastYieldTimeInterval += timeSinceLastUpdate
screenIsPaused = 2
} else if screenIsPaused == 3{
gameLayer.isPaused = true
}else if screenIsPaused == 2{
lastYieldTimeInterval += timeSinceLastUpdate
}
}
I moved that screenIsPaused if statements here instead of my update(_ currentTime: TimeInterval). In addition, I added lastYieldTimeInterval += timeSinceLastUpdate into each of the if statements. Now every time the game pauses or un-pauses the time is updated.