title: Is it possible to hide UINavigationController then show it when user swipe down?
body: <p>I have a view that I want to have full screen, I'm hiding system bar and <code>UINavigationBar</code> but I would like to have it re-appear on some user interaction e.g. drag content down or press near top edge etc. (which ever is easier to implement and more user friendly).</p>
  
  <p>I've searched with no success so far thus my question on SO.</p>
  
  <p>EDIT:
  Worth to mention is that this view that is displayed full screen is UIWebView and UINavigationBar is used on this view to give "go back" ability with back button.</p>