UISearchController in NavigationItem iOS 11 Apple way

问题

In iOS 11 Apple presented new search bar, but yet in iOS 11.2.2 developer have push\pop animation bug when both view controllers have searchController. Apple demonstrate their vision in Files app. Do someone know how do it?

edit#1

Question with broken animation. Broken UISearchBar animation embedded in NavigationItem

来源：https://stackoverflow.com/questions/48278159/uisearchcontroller-in-navigationitem-ios-11-apple-way