Trying to add levels to my swift sprite kit game - swift

Question

I'm trying to add one simple level to my flappy bird styled game. I figure a way of doing it using 2 different scenes but would prefer it to be within the same one. I simply want the walls to appear more frequently once a score of 15 has been reached! Here is my code
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if gameStarted == false{
gameStarted = true
body.physicsBody?.affectedByGravity = true
let spawn = SKAction.run({
() in
self.createWalls()
})
let delay = SKAction.wait(forDuration: 2.0)
let spawnDelay = SKAction.sequence([delay, spawn])
let spawnDelayForever = SKAction.repeatForever(spawnDelay)
self.run(spawnDelayForever)
let distance = CGFloat(self.frame.width + wallPair.frame.width)
let movePipes = SKAction.moveBy(x: -distance - 50, y: 0, duration: TimeInterval( 0.01 * distance))
let removePipes = SKAction.removeFromParent()
moveAndRemove = SKAction.sequence([movePipes,removePipes])
body.physicsBody?.velocity = CGVector(dx: 0, dy: 0)
body.physicsBody?.applyImpulse(CGVector(dx: 0, dy: 68))
run(flap)
}
Ive tried adding a if statement before which was an if statement like
if score = 20{
but that just delays applying impulse till the player has a score of 20.
Is there a way I can say
if score is between 0 and 20 then run my first spawning action
then another saying if score > 20 run my second spawning action which would just have a slower spawning time?
Hope this makes sense! Thanks

Answer 1

You could move the spawnDelayForever logic into a function and call it first with the 2 second delay as parameter, then when the game score gets to 20, call the spawnDelayForever function again passing 5 as input parameter. You would need to add the action using a key.
self.run(spawnDelayForever(withDelay: 2.0), withKey: "spawnDelayForever")
Then remove the running action before adding again.
self.removeAction(forKey: "spawnDelayForever")
self.run(spawnDelayForever(withDelay: 5.0), withKey: "spawnDelayForever")
Your code might look something like this.
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if gameStarted == false {
gameStarted = true
body.physicsBody?.affectedByGravity = true
self.run(spawnDelayForever(withDelay: 2.0), withKey: "spawnDelayForever")
// other code...
} else if score > 20 && spawnDelayApplied == false {
self.removeAction(forKey: "spawnDelayForever")
self.run(spawnDelayForever(withDelay: 5.0), withKey: "spawnDelayForever")
spawnDelayApplied = true
}
}
func spawnDelayForever(withDelay sec: TimeInterval) -> SKAction {
let spawn = SKAction.run({
() in
self.createWalls()
})
let delay = SKAction.wait(forDuration: sec)
let spawnDelay = SKAction.sequence([delay, spawn])
return SKAction.repeatForever(spawnDelay)
}