title: How can I animate a UIView underneath the UINavigationController's view
body: <p>Right now I'm animating a little banner that sometimes appears directly under the NavigationBar. This UIView lives on a subclass of UINavigationController in my app.</p>
  
  <p>I want to animate the banner view up and under the navigationBar when its time for the view to disappear (as opposed to animating it's height to 0 which can cause wacky things to occur to subviews of the banner). However, it's always animating on top of the navBar.</p>
  
  <p>I've tried sending my view to the back (-sendSubviewToBack:) however, then I don't see it all. Then I tried -bringSubviewToFront, and giving it the navigationBar's view. That didn't work either.</p>
  
  <p>Any ideas?</p>