title: Use the increased navigation-bar title in iOS 11
body: <p>iOS 11 Beta 1 uses the increased navigation-bar title for almost all system-apps (it started doing this in iOS 10 and the Music app). I am wondering if Apple has a public API for this coming in iOS 11, or whether it will stay private for now. </p>
  
  <p>The behavior is that the title has an increased font-size, is left aligned and will move to the navigation-bar once the user scrolls down. I've attached some screens showing this behavior in the Messages app here:</p>
  
  <p><a href="https://i.stack.imgur.com/vOITO.png" rel="noreferrer"><img src="https://i.stack.imgur.com/vOITO.png" alt="enter image description here"></a></p>
  
  <p>Although I could not find any reference in the <code>UINavigationController</code> and <code>UINavigationBar</code> so far, maybe someone knows some more details!</p>