title: Appearance proxy - setShadowImage alternative for iOS 5?
body: <p>Hello I'm using this code to set the shadow image of my navbar:</p>
  
  <pre><code>if ([self.navigationController.navigationBar respondsToSelector:@selector(shadowImage)]) {
  
      [[UINavigationBar appearance] setShadowImage:[UIImage imageNamed:@"nav-bar-shadow"]];
  
      [[UIToolbar appearance] setShadowImage:[UIImage imageNamed:@"tool-bar-shadow"]  forToolbarPosition:UIToolbarPositionAny];
  }
  </code></pre>
  
  <p>However it seems this is iOS 6 only (though I can't say for sure - I can't find documentation about this anywhere). It doesn't work on iOS 5.</p>
  
  <p>Is there some kind of alternative - globally setting an image under the navbar?
  I thought of custom UIView, but how to do this globally?</p>