title: adding a footer overlay to the main window, to be shown over every subview, in an application using navigation controller
body: <p>I'm working on an iPhone app where I'm using a navigation controller (UINavigationController) to navigate through the various child views, and I would like to add a uiview to either the main window or the navigation controller, as a footer overlay that shows up on top of all the child views.  I've tried this through interface builder, and programmatically, but nothing seems to work.</p>
  
  <p>Working in interface builder, I've tried adding the footer to the bottom of the main window, and decreasing the height of the child views so the footer would show up, but the children seem to resize to fill the whole window.  I've tried playing with some of the options, like 'wants full screen', 'resize view from NIB', tried to resize the navigation controller and couldn't.  Same problem when I try to add it programmatically instead.</p>
  
  <p>I can add a toolbar to the navigation controller in interface builder, is there a way to add a UIView instead?  Or even attach a UIView to a toolbar?  I'm sure there's a simple way to do what I'm trying, I'm hoping someone out there has had a similar experience.</p>
  
  <p>Thanks!</p>