title: What happens to the root view in UINavigationViewController when you push on a new view?
body: <p>Specifically, what am I supposed to do with the view that is now hidden after pushing on a new view controller?<br>
  In my situation I have a view with animations going on, that continue to execute after the view is off screen.</p>
  
  <p>Is there some accepted convention?
  Do I remove the View Controller and View from memory?<br>
  Does Cocoa Touch have a convenient method to "Pause" a view (and controller) and remove it from memory, and bring it back into existence when needed (after a pop)?
  Do I have to archive it myself and then un-archive it?</p>
  
  <p>Are there any examples you can point me to?</p>
  
  <p>Thanks  </p>