title: addChild after 2 seconds
body: <p>I'm trying to addChild after 2 seconds the user touched the screen (it is inside touchesBegan), but it doesn't work. Am I doing anything wrong?</p>
  
  <pre><code>//show myLabel after 2 seconds
  self.myLabel.position = CGPoint(x: self.frame.width / 1.1, y: self.frame.height / 2)
  self.myLabel.text = "0"
  self.myLabel.zPosition = 4
  
  self.myLabel.runAction(SKAction.sequence([SKAction.waitForDuration(2.0), SKAction.runBlock({
      self.addChild(self.myLabel)
  )]))
  </code></pre>