title: iOS Dev - How to detect that user gets to this UIViewController by pressing "Back"
body: <p>I have an iOS app with 3 tabs:</p>
  
  <ul>
  <li>Home</li>
  <li>Tab1</li>
  <li>Tab2</li>
  </ul>
  
  <p>In "Home", user can navigate to a view - <code>UIViewcontroller1</code> - to view the details. When the user pressed "Back" in <code>UIViewcontroller1</code> to go back to "Home", I would like to detect in Home <code>viewDidLoad()</code> that the user came here by pressing "Back" in <code>UIViewcontroller1</code>. </p>
  
  <p>Is there a simple way to detect this?</p>