iOS 11: Search Bar in Navigation Bar

//Variables fileprivate let searchController = UISearchController(searchResultsController: nil) //Setup Search Controller self.searchController.obscuresBackgroundDuringPresentation = false self.searchController.searchBar.placeholder = "Search".localized() self.searchController.searchBar.barStyle = .black self.searchController.searchBar.delegate = self self.definesPresentationContext = true self.navigationItem.searchController = searchController //MARK: SEARCH BAR DELEGATE extension ViewController: UISearchBarDelegate { func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) { //Show Cancel searchBar.setShowsCancelButton(true, animated: true) searchBar.tintColor = .white } func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) { //Filter function self.filterFunction(searchText: searchText) } func searchBarSearchButtonClicked(_ searchBar: UISearchBar) { //Hide Cancel searchBar.setShowsCancelButton(false, animated: true) searchBar.resignFirstResponder() guard let term = searchBar.text , term.trim().isEmpty == false else { //Notification "White spaces are not permitted" return } //Filter function self.filterFunction(searchText: term) } func searchBarCancelButtonClicked(_ searchBar: UISearchBar) { //Hide Cancel searchBar.setShowsCancelButton(false, animated: true) searchBar.text = String() searchBar.resignFirstResponder() //Filter function self.filterFunction(searchText: searchBar.text) } }