gistfile1.txt

    override func viewDidLoad() {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewControllerWithIdentifier("Search")
        
        self.searchController = UISearchController(searchResultsController: vc)
        self.searchView.addSubview(searchController.searchBar)
        self.searchController.hidesNavigationBarDuringPresentation = false
        self.searchController.dimsBackgroundDuringPresentation = false
        self.searchController.searchBar.searchBarStyle = .Minimal
        self.searchController.searchBar.sizeToFit()
        self.navigationItem.titleView = searchController.searchBar
        self.definesPresentationContext = true

        let resultsController = SearchViewController()
        self.searchController.searchResultsUpdater = resultsController
    }

...

extension SearchViewController: UISearchResultsUpdating {
    func updateSearchResultsForSearchController(searchController: UISearchController) {
        let searchString = searchController.searchBar.text
        
        filteredArray = dataArray.filter({ (country) -> Bool in
            let countryText: NSString = country
            
            return (countryText.rangeOfString(searchString!, options: NSStringCompareOptions.CaseInsensitiveSearch).location) != NSNotFound
        })
        
        tblSearchResults.reloadData()
    }
}