title: iOS7 Keyboard Return/Done/Search tint colour
body: <p>With the new iOS7 UIView tint color it becomes pretty easy to theme an entire app quickly. It even changes the color of the text caret when editing UITextFields.</p>
  
  <p>However, the keyboard's bottom right 'dismiss' button (can be Done, Search, etc) is always blue. Is there any way to change this? It would look really nice if it matched the tint color of the rest of the app.</p>
  
  <p><img src="https://i.stack.imgur.com/y0Vv3.png" alt="iOS7 UISearchBar keyboard"></p>