When i remove the searchController from navigationItem by setting 'nil'. Empty space is left behind where it used to be instead of collapsing.
Tried calling,
searchController.dismiss()
navigationController.navigationItem.searchController.dismiss()
navigationItem.searchController.dismiss()
searchController.isActive = false
Nothing worked.
P.S - Using simulator
You should layout subviews after removing search controller. The trick is which superview's subview you have to layout: since navigationItem is part of navigation stack, so you should call layoutSubviews() onto current navigationController:
navigationItem.searchController = nil
navigationController?.view.setNeedsLayout()
navigationController?.view.layoutIfNeeded()
According to Apple Documentation you shouldn't call layoutSubviews() directly.