title: Gamescene spriteNodes in array
body: <p>Getting an error on this pice of code.
  I Don't want to go through the spriteNode on GameScene.sks manually (in code) - the for loop must work somehow? Any ideas...</p>
  
  <pre><code>let sprites:[SKSpriteNode] = [block1, block2, block3, block4,
      block5, block6, block7, block8, block9, block10, block11,
      block12, block13, block14, block15, block16, block17,
      block18, block19, block20, block21, block22, block23,
      block24, block25, block26, block27, block28, block29, 
      block30, block31, block32, block33, block34, block35,
      block36, block37, block38, block39, block40, block41,
      block42, block43, block44, block45, block46, block47,
      block48, block49, block50, block51, block52, block53,
      block54, block55, block56, block57, block58, block59,
      block60, block61, block62, block63, block64, block65,
      block66, block67, block68, block69, block70, block71,
      block72, block73, block74, block75, block76, block77,
      block78, block79, block80, block81, block82, block83, block84]
  
  for sprite in sprites {
      self.sprite; in sprites = (self.childNode(withName: sprite.name) as? SKSpriteNode)!
      sprite.name = "Green"
      sprite.zPosition = 3
  }
  </code></pre>