title: Large title to small title switch in navigation bar is not smooth iOS 13, sticky
body: <p>I have a <code>UINavigationController</code> with default value of it's <code>navigationBar.prefersLargeTitles = true</code> . </p>
  
  <p>I am switching that to <code>false</code> when I <code>push</code>  into a new scene lets call it (<code>DetailsViewController</code>), by changing it into the <code>viewWillDisappear</code> . </p>
  
  <pre><code>override func viewWillDisappear(_ animated: Bool) {
     super.viewWillDisappear(animated)
     navigationController?.navigationBar.prefersLargeTitles = false
  }
  </code></pre>
  
  <p>Now in <code>DetailsViewController</code> I am using <code>willMove(to parent:)</code> . </p>
  
  <pre><code>override func willMove(toParent parent: UIViewController?) {
          navigationController?.navigationBar.prefersLargeTitles = true
  }
  </code></pre>
  
  <p>To transition back to large titles . </p>
  
  <p>Observe the attached snapshots of how <strong>iOS 13</strong> doing it with how <strong>iOS 12</strong> is doing it, considering <strong>iOS 12</strong> is the correct behavior. </p>
  
  <p><strong>iOS 13</strong> :</p>
  
  <p><a href="https://i.stack.imgur.com/YrNTv.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/YrNTv.gif" alt="iOS 13"></a></p>
  
  <p><strong>iOS 12</strong> : </p>
  
  <p><a href="https://i.stack.imgur.com/Qr4Wu.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/Qr4Wu.gif" alt="iOS 12"></a></p>