title: Add UIView banner above status bar iOS 7
body: <p>I'm trying to add a banner above the status bar when receiving an in-app push notification. From what I've been reading, it seems like the only way to dynamically change the status bar style in iOS 7 is to set <code>UIViewControllerBasedStatusBarAppearance</code> to <code>NO</code>. This is not only really annoying to have to change all my different view controllers <code>prefersStatusBarHidden</code> to <code>[UIApplication sharedApplication].statusBarHidden</code>, but it also doesn't give the effect I'm looking for. </p>
  
  <p>When the banner slides from the top, I still want the 20 pts of space that the status bar provides to stay, but the status bar content to disappear until after the banner slides back up. Is there a way to either do this or add a subview or window above the status bar?</p>
  
  <p>Basically I'm looking to do this:</p>
  
  <p><img src="https://i.stack.imgur.com/QOPRR.png" alt="Facebook Messenger push banner"></p>