Keeping SKNode at the edge of a screen when scene is scaled.

GameScene.swift

private var initialSize: CGSize = .zero
private var presentedSize: CGSize { return scene?.view?.bounds.size ?? size }
private var presentedScaleFactor: CGFloat { return initialSize.width / presentedSize.width }
    
override func sceneDidLoad()
{
  super.sceneDidLoad()
  initialSize = size
}
    
    
func layoutNodes()
{
  let margin: CGFloat = 10
        
  if let topRight = childNode(withName: "topRight") as? SKSpriteNode
  {
    topRight.position.x = presentedSize.width / 2.0 * presentedScaleFactor - topRight.size.width / 2.0 - margin
    topRight.position.y = presentedSize.height / 2.0 * presentedScaleFactor - topRight.size.height / 2.0 - margin
  }
}