title: Lock sub UIView's to the topLayoutGuide
body: <p>I have a view that extends underneath the <code>UINavigationBar</code>. This view has a subview (<strong>MrSubview</strong>) that should sit below the navigation bar. When I animate the <code>UINavigationBar</code> away the controllers <code>topLayoutGuide</code> will change. In this case I want <strong>MrSubview</strong> to move up. </p>
  
  <p>My first thought was that I need to give <code>UIView</code> the <code>topLayoutGuide</code> so it can use it in an auto layout, but I guess the view should not be coupled to the controller.</p>
  
  <p>I am looking for the best way to do this.</p>
  
  <p>How does <code>UITableView</code> and <code>UIScrollView</code> do this?</p>