title: How do I catch when UIViewController displays after dismissViewControllerAnimated
body: <p>I've got two <code>UIViewControllers</code>. I'm using modal segue to the second one, when coming back I use <code>dismissViewControllerAnimated</code>. I want to fire a method when I come back to the first one. How can I do that?</p>
  
  <p>I tried to fire a custom notification before <code>dismissViewControllerAnimated</code> and catching it in the first <code>UIViewController</code>, but it doesn't catch anything, because it's still on the second one when it's fired.</p>