How to stop your UISearchController bar hiding when you scroll
You can embed a search controller right into any view controller that’s inside a UINavigationController using code like this:
navigationItem.searchController = yourSearchControllerHowever, when your view controller happens to be a scrolling one – most commonly a table view or a collection view – the search bar will automatically hide itself along with your content.
If this isn’t what you want - if you want the search bar to be visible regardless of the user’s scroll position - then you need to set your navigation item’s hidesSearchBarWhenScrolling property to false, like this:
navigationItem.hidesSearchBarWhenScrolling = falseAvailable from iOS 11.0
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