iOS UISearchController Search Bar in Navigation Bar Title
Example
This example uses a search controller to filter the data inside a table view controller. The search bar is placed inside the navigation bar that the table view is embedded into.
Embed a UITableViewController into a UINavigationController to get the UINavigationItem (which contains the navigation bar).
Then set our custom ViewController class to inherit from UITableViewController and adopt the UISearchResultsUpdating protocol.
class ViewController: UITableViewController, UISearchResultsUpdating {
let entries = [(title: "Easiest", image: "green_circle"),
(title: "Intermediate", image: "blue_square"),
(title: "Advanced", image: "black_diamond"),
(title: "Expert Only", image: "double_black_diamond")]
// An empty tuple that will be updated with search results.
var searchResults : [(title: String, image: String)] = []
let searchController = UISearchController(searchResultsController: nil)
override func viewDidLoad() {
super.viewDidLoad()
searchController.searchResultsUpdater = self
self.definesPresentationContext = true
// Place the search bar in the navigation item's title view.
self.navigationItem.titleView = searchController.searchBar
// Don't hide the navigation bar because the search bar is in it.
searchController.hidesNavigationBarDuringPresentation = false
}
func filterContent(for searchText: String) {
// Update the searchResults array with matches
// in our entries based on the title value.
searchResults = entries.filter({ (title: String, image: String) -> Bool in
let match = title.range(of: searchText, options: .caseInsensitive)
// Return the tuple if the range contains a match.
return match != nil
})
}
// MARK: - UISearchResultsUpdating method
func updateSearchResults(for searchController: UISearchController) {
// If the search bar contains text, filter our data with the string
if let searchText = searchController.searchBar.text {
filterContent(for: searchText)
// Reload the table view with the search result data.
tableView.reloadData()
}
}
// MARK: - UITableViewController methods
override func numberOfSections(in tableView: UITableView) -> Int { return 1 }
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// If the search bar is active, use the searchResults data.
return searchController.isActive ? searchResults.count : entries.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// If the search bar is active, use the searchResults data.
let entry = searchController.isActive ?
searchResults[indexPath.row] : entries[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = entry.title
cell.imageView?.image = UIImage(named: entry.image)
return cell
}
}
