title: What UIView is returned when using -viewWithTag: when several views have same .tag?
body: <p>Say I have 4 UIViews, made in IB, all with the tag property = 2</p>
  
  <p>When I get a view with:   </p>
  
  <pre><code> UIView *thisView = (UIView*)[self.view viewWithTag:2];
  </code></pre>
  
  <p>What is the criterion for retrieving that UIView since several have the same .tag value?</p>
  
  <p>Is it: </p>
  
  <ul>
  <li>random </li>
  <li>the first one created  </li>
  <li>the view with the lowest index in it's superview  </li>
  <li>something else  </li>
  </ul>