title: SpriteKit isUserInteractionEnabled=false Blocks Touches
body: <p>I am building a SpriteKit game.  The game scene is the parent of a transparent layer above it whose role is to display occasional messages to the player.  I want this layer to be transparent and inert most of the time, and of course, never receive touches.  As such, I have isUserInteractionEnabled set to false.  However, when I add this later to the scene, it blocks all touches below it.  What gives?</p>
  
  <p>Edit: the parent of the MessageLayer is the game scene, and the game scene also has isUserInteractionEnabled = false, so I do not believe that the MessageLayer is inheriting the behavior.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>import Foundation
  import SpriteKit
  
  class MessageLayer: SKSpriteNode {
  
      init() {
  
          let size = CGSize(width: screenWidth, height: screenHeight)
          super.init(texture: nil, color: UIColor.blue, size: size)
          self.isUserInteractionEnabled = false
  
          self.name = "MessageLayer"
          alpha = 0.6
          zPosition = +200
      }
  
      override init(texture: SKTexture!, color: UIColor, size: CGSize)
      {
          super.init(texture: texture, color: color, size: size)
      }
  
      required init(coder aDecoder: NSCoder) {
          super.init(texture: nil, color: UIColor.clear, size: CGSize(width: 100, height: 100))
      }
  
      // MARK: - Functions
  
      func alphaUp() {
          alpha = 0.6
      }
  
      func alphaDown() {
          alpha = 0.0
      }
  
  }
  </code></pre>