Displaying search bar in navigation bar in iOS 8

UISearchDisplayController had a boolean property called displaysSearchBarInNavigationBar. What's the equivalent in iOS 8 to have my search bar move up there? Any guidance is greatly appreciated.

Here's my code, I'm not entirely sure why this isn't working. When I click the search bar, it just disappears instead of moving itself and the navigation bar up.

import UIKit

class ViewController: UIViewController, UISearchResultsUpdating, UISearchControllerDelegate, UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource {

let searchController = UISearchController(searchResultsController:  nil)

var tableView = UITableView()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.searchController.searchResultsUpdater = self
    self.searchController.delegate = self
    self.searchController.searchBar.delegate = self

    self.searchController.hidesNavigationBarDuringPresentation = true
    self.searchController.dimsBackgroundDuringPresentation = true

    tableView.dataSource = self
    tableView.delegate = self


    self.navigationItem.titleView = searchController.searchBar


    self.definesPresentationContext = true

    self.setupSearchBar()




}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func updateSearchResultsForSearchController(searchController: UISearchController) {

}

func setupSearchBar() {

    // Set search bar position and dimensions
    var searchBarFrame: CGRect = self.searchController.searchBar.frame
    var viewFrame = self.view.frame
    self.searchController.searchBar.frame = CGRectMake(searchBarFrame.origin.x, searchBarFrame.origin.y + 64,viewFrame.size.width, 44)


    // Add search controller's search bar to our view and bring it to forefront
    self.view.addSubview(self.searchController.searchBar)

}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    var cell = UITableViewCell()

    return cell
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 5
}
}

According to Apple :

UISearchDisplayController is deprecated in iOS 8. (Note that UISearchDisplayDelegate is also deprecated.) To manage the presentation of a search bar and display search results in iOS 8 and later, instead use UISearchController.

The UISearchController class defines an interface that manages the presentation of a search bar in concert with the search results controller’s content. The search results controller, a UIViewController object specified by the searchResultsController property, manages the results of the search.

Now you can use the UISearchController to show the search bar in your navigation bar in the following way:

class ViewController: UIViewController, UISearchControllerDelegate, UISearchResultsUpdating, UISearchBarDelegate {

    var searchController : UISearchController!

    override func viewDidLoad() {
       super.viewDidLoad()

       self.searchController = UISearchController(searchResultsController:  nil)

       self.searchController.searchResultsUpdater = self
       self.searchController.delegate = self
       self.searchController.searchBar.delegate = self

       self.searchController.hidesNavigationBarDuringPresentation = false
       self.searchController.dimsBackgroundDuringPresentation = true

       self.navigationItem.titleView = searchController.searchBar

       self.definesPresentationContext = true        
    }

    func updateSearchResults(for searchController: UISearchController) {

    }

    override func didReceiveMemoryWarning() {
       super.didReceiveMemoryWarning()
       // Dispose of any resources that can be recreated.
    }
}

But you have to consider you need to set a UINavigationController like in this Storyboard :