Implementing a Search Bar, Building an iTunes Search App! Any idea why the keyboard is not coming up on my end?

import UIKit

class SearchResultsController: UITableViewController
{

    let searchController = UISearchController(searchResultsController: nil)

    override func viewDidLoad()
    {
        super.viewDidLoad()


        self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector (SearchResultsController.dismissSearchResultsController))

        tableView.tableHeaderView = searchController.searchBar
        //Dismissing backGround..
        searchController.dimsBackgroundDuringPresentation = false
        //Responsible for updating the content..
        searchController.searchResultsUpdater = self
    }

    @objc func dismissSearchResultsController()
  {
    //This dismiss the viewController..
    self.dismiss(animated: true, completion: nil)

  }

}

extension SearchResultsController: UISearchResultsUpdating
{
    func updateSearchResults(for searchController: UISearchController)
    {
        print(searchController.searchBar.text!)
    }
}