Open Radar

 
Summary:
In a split view based app on iPhone, when pushing a detail view controller using [self showDetailViewController:sender:], the detail view controller won't show its navigationItem.searchController search bar.

Instead the insets will be a bit wrong and any scroll view content will jump up behind the bar when you try to reveal the search bar.

If you use showViewController:sender: instead, the large navigation bar and the search field will show up correctly. However, this is not always the correct thing to do it split view based apps.

Steps to Reproduce:
1. Create a split view controller based app and run it on iPhone (I tested on iPhone SE simulator).

2. Make a master navigation controller whose navigation bar prefersLargeTitles = YES.

3. Use showDetailViewController:sender: to push a UITableViewController which has its navigationItem.searchController set to a UISearchController

4. Try to reveal search bar.

Expected Results:
The search bar should show up below the large title

Observed Results:
The search bar doesn't seem to exist, and content insets get bugged and the content end up behind the navigation bar

Version:
iOS 11 Beta (all builds)

Notes:
Workaround: Use showViewController:sender: instead of showDetailViewController:sender:. This however will break the intended behaviour of a split view based app.