title: Why should I use a UIToolbar vs using a UIView?
body: <p>I'm building an instant messenger app in iOS. In particular I'm implementing the UI for a conversation in the most typical way, that is placing an input bar at the bottom of the view (<code>UICollectionView</code> to be clear) that scrolls above the keyboard.
  Now, I'm wondering if I should implement this view as a <code>UIToolbar</code> with <code>UIBarButtonItem</code>s instead of a custom <code>UIView</code> with <code>UIButton</code>s. What are the advantages of a <code>UIToolbar</code>?</p>