title: How to handle return event in storyboard?
body: <p>I have simple question.
  I using storyboard with Navigation Controller.
  Application performs a push segue from first VC to another. 
  After user press a "Back" button, he will return, to first VC.
  I need to handle this event, to refresh display data.</p>
  
  <p>How can I do it?</p>
  
  <p>Thanks.</p>