Navigation Bar doesn't increase height when UISearchBar is embedded with largest text size in iPad

Question

I am supporting DynamicType in my application. In one of my search screen I have UISearBar set as navigationItem.titleView. It works fine when text size is normal. But when we increase text size to largest from Accessibility -> Display & Text Size -> Larger text (on), Search bar increase size but not Navigation bar.

This works fine in iPhone, if you increase Text size in iPhone Navigation bar height is also changing accordingly.

Is there any solution

Code

let searchBar = UISearchBar(frame: self.navigationController!.navigationBar.bounds)
searchBar.showsCancelButton = true
searchBar.delegate = self
navigationItem.titleView = searchBar