UISearchController persisting after segue

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You can hide the searchController manually by setting the active property to false in prepareForSegue. Add the below code in prepareForSegue()

searchController.active = false

Alternatively, you should add the following line in viewDidLoad() to get the default behaviour

definesPresentationContext = true

From the documentation for definesPresentationContext

A Boolean value that indicates whether this view controller’s view is covered when the view controller or one of its descendants presents a view controller.

Discussion

When a view controller is presented, iOS starts with the presenting view controller and asks it if it wants to provide the presentation
context. If the presenting view controller does not provide a context,
then iOS asks the presenting view controller’s parent view
controller. iOS searches up through the view controller hierarchy
until a view controller provides a presentation context. If no view
controller offers to provide a context, the window’s root view
controller provides the presentation context.

If a view controller returns true, then it provides a presentation
context. The portion of the window covered by the view controller’s
view determines the size of the presented view controller’s view.
The default value for this property is false.

Important note (from @paulvs in the comments)

Little gotcha. Set definesPresentationContext on the view controller, not the search controller, I think this is worth emphasising.

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