title: iOS 11 large navigation bar title unexpected velocity
body: <p>I am trying to implement the iOS 11 native large navigation bar title on my new application.  By calling below functions in viewDidLoad(): </p>
  
  <p><code>navigationController?.navigationBar.prefersLargeTitles = true</code> <code>navigationController?.navigationItem.largeTitleDisplayMode = .always</code></p>
  
  <p>I do get what I desired.
  <a href="https://i.stack.imgur.com/w9cPK.png" rel="noreferrer"><img src="https://i.stack.imgur.com/w9cPK.png" alt="enter image description here"></a></p>
  
  <p>But, when I start scrolling up (the only view inside the main view is a scroll view), the scrolling makes the large title disappear at a faster velocity than actual scroll with the finger.  (that is, if I move 2cm on screen, the scroll view actually scrolls more than 2cm, up until the large title shrinks to the 'usual' size.)</p>
  
  <p>The below is the gif of my app being scrolled.  I actually move very little, and it automatically scrolls up that much.  This differs from the Apple-made applications (the app store for instance, shown below my app).</p>
  
  <p>Does anyone have solution to solving this abnormal behaviour?</p>
  
  <p><a href="https://i.stack.imgur.com/eO9Yh.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/eO9Yh.gif" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/ZxSJ1.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/ZxSJ1.gif" alt="enter image description here"></a></p>
  
  <p>EDIT:
  Per request, I am adding the current View hierarchy.  There isn't anything special in my code, I just set the title and flag for <code>prefersLargeTitles</code>.  </p>
  
  <p><a href="https://i.stack.imgur.com/tKhDk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tKhDk.png" alt="enter image description here"></a></p>