There is NO UISearchController in IB, only the UISearchDisplayController; where do I find docs on creating it?
From documentation;
Important: UISearchDisplayController is deprecated in iOS 8. (Note that UISearchDisplayDelegate is also deprecated.) To manage the presentation of a search bar and display search results in iOS 8 and later, instead use UISearchController.
Read UISearchController documentation. There is an example how to create UISearchController, not in IB but programmatically.
来源：https://stackoverflow.com/questions/33711358/how-do-i-create-a-uisearchcontroller-since-uisearchdisplaycontroller-is-deprecat