title: How do you get the available bounds inside a UITabBarController
body: <p>When using a UITabBarController, how do you get the size of the tab bar at the bottom  ?Similarly, how do you know how much room you have inside the tabbed-view for your content? I see a lot of examples of people sizing their tab child views to [[UIScreen mainScreen] applicationFrame], which can’t be correct because the tab bar takes up some room at the bottom of the screen.</p>
  
  <p>Also, is it possible to modify the size of the tab bar?</p>
  
  <p>Thanks
  Ryan</p>