title: calling a parent UIViewController method from a child UIViewController
body: <p>I have a Parent UIViewController, which opens a child UIViewController:</p>
  
  <pre><code>let storyboard = UIStoryboard(name: "Main", bundle: nil)
  let vc = storyboard.instantiateViewControllerWithIdentifier("myChildView") as! UIViewController
  self.presentViewController(vc, animated: true, completion: nil)
  </code></pre>
  
  <p>I press a Button in the ChildView which should close the the ChildView and call a method in the Parent View:</p>
  
  <pre><code>self.dismissViewControllerAnimated(true, completion: nil)
  CALL PARENTS METHOD  ??????
  </code></pre>
  
  <p>How to do that ? 
  I found a good answer (<a href="https://stackoverflow.com/questions/28427977/call-parentcontroller-method-from-childcontroller-in-swift">Link to good answer</a>), but I am not sure if this is the best practice with UIViewControllers. Can someone help ?</p>