title: Custom title view as large title in iOS 11 new navigation bar
body: <p>I am using a button as a title view for my <code>UITableViewController</code> which opens a dropdown list of categories. Selecting a category filters content of the table view by the selected category.</p>
  
  <p>The button shows the name of the selected category plus a small arrow, similar to how iBooks used to look (or maybe still looks? I haven't used it in a while). I would therefore like it to have the same behaviour as a standard title and have it be large at first and collapse when the table view is scrolled.</p>
  
  <p>Is there a way to do this?</p>
  
  <p>Thanks</p>