title: iOS Raised Centre Tab Button
body: <p>I have seen many examples of the raised center button on a <code>UITabBar</code>, most being just a <code>UIButton</code> placed over the top but all of these need coding on every view, Is there a way of creating this without having to program every view so it will appear on every screen, perhaps something in the app delegate?</p>
  
  <p>I want to achieve a <code>UITabBar</code> with a raised circle in the center.</p>