Cannot add UISearchController to UIViewController

Question

I am trying to add a UISearchController to a programatically created UITableView, in a UIViewController class. Here is my code:

var resultSearchController = UISearchController()

var myTableView = UITableView()

override func viewDidLoad() {
    super.viewDidLoad()

    myTableView.frame = CGRectMake(0, 0, view.bounds.width, view.bounds.height)
    myTableView.delegate = self
    myTableView.dataSource = self

    myTableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")

    self.resultSearchController = ({
        let controller = UISearchController(searchResultsController: nil)
        controller.searchResultsUpdater = self //ERROR
        controller.searchBar.delegate = self //ERROR
        controller.dimsBackgroundDuringPresentation = false
        controller.searchBar.sizeToFit()

        self.myTableView.tableHeaderView = controller.searchBar

        return controller
    })()

    UIApplication.sharedApplication().keyWindow?.addSubview(myTableView)

}

The two errors I get are

 - Cannot assign a value of type 'ViewController' to a value of type 'UISearchBarDelegate?
 - Cannot assign a value of type 'ViewController' to a value of type 'UISearchResultsUpdating?

This code works when my class is subclassed with UITableViewController. So why doesn't it work with UIViewController?

Answer 1

Make sure your UIViewController is conforming to the protocols UISearchBarDelegate and UISearchResultsUpdating.

class YourViewController: UIViewController, UISearchBarDelegate, UISearchResultsUpdating {
    // …truncated
}

UITableViewController automatically does this behind the scenes.