Step Counter Sprite Kit - swift

Question

I am trying to implement a step counter in my sprite Kit game.
And it should work like this:
The counter adds 1 to a value each second.
Every fifth second the duration (in this case 1) gets divided by 1.1
But if I create a func that returns the new duration, the repeat forever SKAction only uses this value for one time and then the duration never changes again.

Answer 1

you should make an action that calls itself, rather than using SKAction.repeatForever(...). you can recalculate values that way. not sure i entirely understand your use case, but here is an example that fires an event after a duration, and modifies that duration every fifth cycle.
var isLoopEnabled:Bool = true
var counter:Int = 0
var duration:TimeInterval = 1.0
func updateDuration() {
duration /= 1.1
}
/*
creates an event loop. the action waits, fires, then calls itself again (before exiting)
turn the loop off using the isLoopEnabled flag
*/
func loop() {
let wait = SKAction.wait(forDuration: duration)
let run = SKAction.run {
self.counter += 1 //increment counter
//update duration every fifth count
if self.counter % 5 == 0 {
self.updateDuration()
}
}
let end = SKAction.run{
print("\(self.counter) -- duration: \(self.duration)")
guard self.isLoopEnabled else { return } //flag allows you to exit loop
self.loop() //repeats by calling itself
}
let sequence = SKAction.sequence([ wait, run, end ])
self.run(sequence, withKey:"loop action")
}
override func didMove(to view: SKView) {
loop()
}