DropCharge causing memory leak

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As of june 2020, swift 5 iOS 13.5, I have updated the method “updateLevel” based on @ivanchenhz solution. When overlays are added in the scene, check every “Overlay” nodes out of camera and remove them. I am quite new to swift so please let me know if this is the wrong way to “fix” the issue.

First, let’s see the issue :

  • set to true view.showsFPS and view.showsNodeCount in GameViewController.swift
  • set an insane amount of gain in setPlayerVelocity(_: ) to very quickly add new layers
func setPlayerVelocity(_ amount:CGFloat) 
{
 let gain: CGFloat = 100
 player.physicsBody!.velocity.dy = max(player.physicsBody!.velocity.dy, amount * gain)
}

Quickly, the amount of nodes is above 10K, 15K, 20K, too much K and FPS goes from 60fps to almost 0

Now, let’s remove nodes not needed anymore since they will never be visible again

func updateLevel() 
{
 let cameraPos = camera!.position
 if cameraPos.y > levelPositionY - size.height 
 {
  createBackgroundOverlay()
  while lastOverlayPosition.y < levelPositionY 
  { 
   addRandomForegroundOverlay() 
  }

  // Start fix here, remove off screen nodes
  enumerateChildNodes(withName: "//Overlay")
  {
   [weak self] node, _ in
   guard let self = self else { return }

   let cameraPos = self.camera!.position
   if node.position.y + self.backgroundOverlayHeight < cameraPos.y
   {
    node.removeFromParent()
   }
  }
 // End fix 
 }
}

Now, the nodes count stay in an acceptable range 150…250 and FPS stay at 60fps

I hope it can be of any help.