title: How to turn from large to small title with animation
body: <p>Is there any way to change the navigation bar from large to small title with animation on the same controller when tapping a button for example? Now I tried to set:</p>
  <pre><code>navigationItem.largeTitleDisplayMode = .never
  </code></pre>
  <p>But it does not support to have the animation. Please give a help. Thanks a lot.</p>