import UIKit

class LocationMapViewController: UIViewController, UISearchBarDelegate, NMapViewDelegate, NMapPOIdataOverlayDelegate, NMapLocationManagerDelegate {

    var mapView: NMapView?
    var changeStateButton: UIButton?
    let searchBar = UISearchBar()

    func createSearchBar()
    {
        searchBar.showsCancelButton = false
        searchBar.placeholder = "Enter your search here!"
        searchBar.delegate = self

        self.navigationItem.titleView = searchBar
    }
  ...
}

override func viewDidLoad() {
    super.viewDidLoad()
    createSearchBar()
    ...
}