title: Swift 3.0: Paramater to check for action completion
body: <p>I recently started learning app development and almost every tutorial I can find is not in swift 3, so sometimes I run into confusion when it comes to the syntax for certain things that have been changed. </p>
  
  <pre><code>//Take the user to the game screen from the intro scene
          let introLabel = childNode(withName: "introLabel")
  
              if introLabel != nil{
                  let fadeOut = SKAction.fadeOut(withDuration: 1)
  
                  introLabel?.run(action: fadeOut, completion: () -&gt; Void)
          }
  </code></pre>
  
  <p>I have searched all around the internet and can't seem to find the missing thing I am supposed to put here (By completion: )</p>