title: hidesBarsOnSwipe with UITabBar
body: <p>I recently switched to using a <code>UITabBarController</code> within my app and was not amused to find I could not make <code>hidesBarsOnSwipe</code> work with it. I use to simply say (within the view controller) <code>hidesBarsOnSwipe = true</code>, but now that does not work. If someone could help me make this work, that would be great.</p>
  
  <p>Thanks!</p>