title: iOS 11 - Display large title on UINavigationBar without using UINavigationController
body: <p>I have <code>UIViewController</code> with <code>UINavigationBar</code> as a subview. No <code>UINavigationController</code> is involved.</p>
  
  <p>I'm trying to display large titles. As the <a href="https://developer.apple.com/documentation/uikit/uinavigationbar/2908999-preferslargetitles" rel="nofollow noreferrer">docs directed</a> us to do:</p>
  
  <pre><code>myCustomNavigationBar.prefersLargeTitles = true
  myCustomNavigationItem.largeTitleDisplayMode = .always
  </code></pre>
  
  <p>But it remains at the previous display mode (iOS 10 navigation mode). </p>
  
  <p>When trying the same code with <code>UINavigationController</code> it works as expected. Is it not possible without <code>UINavigationController</code> or am I not approaching this correctly? </p>