title: iOS 8 - setting the inner color of a UISearchBar
body: <p>I am trying to make a search bar fill the full screen width and be one solid color in a rectangle shape. However, setting the 'tint color' only sets the color of the search bar border.<br>
   How can the inner color be set too, either in Swift or directly in xCode 6? This could be done using a text field instead, but I prefer the search bar for maintainability and its extra features.</p>