如何使用 swift 为我的 iOS 应用程序创建一个简单的导航视图

我正在尝试为我的主从应用程序创建一个非常简单的导航视图控制器。我正在使用 swift (2) 并具有以下代码：

import MapKit
import UIKit
import CoreData
import CoreLocation

class DirectionsViewController: UIViewController, CLLocationManagerDelegate,MKMapViewDelegate {

    @IBOutlet weak var mapView: MKMapView!

    let locationManager = CLLocationManager()

    var point1 = MKPointAnnotation()
    var point2 = MKPointAnnotation()
    var myRoute : MKRoute?

    override func viewDidLoad() {
        super.viewDidLoad()
        // Ask for Authorisation from the User.
        self.locationManager.requestAlwaysAuthorization()

        // For use in foreground
        self.locationManager.requestWhenInUseAuthorization()

        if CLLocationManager.locationServicesEnabled() {
            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
            locationManager.startUpdatingLocation()
        }

    }
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        var locValue:CLLocationCoordinate2D = manager.location.coordinate
        point1.coordinate = CLLocationCoordinate2DMake(locValue.latitude, locValue.longitude) //code to sync in current location
        point1.title = "You are here"
        point1.subtitle = "Start"
        mapView.addAnnotation(point1)
        // to test location  - print("locations = \(locValue.latitude) \(locValue.longitude)")

        point2.coordinate = CLLocationCoordinate2DMake(40.22396739999999, -74.0303199)
        point2.title = "First Pentecostal Church"
        point2.subtitle = "Neptune, NJ"
        mapView.addAnnotation(point2)
        mapView.centerCoordinate = point2.coordinate
        mapView.delegate = self
        //Span of the map
        mapView.setRegion(MKCoordinateRegionMake(point2.coordinate, MKCoordinateSpanMake(0.7,0.7)), animated: true)

        var directionsRequest = MKDirectionsRequest()
        let markUser = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point1.coordinate.latitude, point1.coordinate.longitude), addressDictionary: nil)
        let markFPC = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point2.coordinate.latitude, point2.coordinate.longitude), addressDictionary: nil)

        directionsRequest.setSource(MKMapItem(placemark: markUser))
        directionsRequest.setDestination(MKMapItem(placemark: markFPC))
        directionsRequest.transportType = MKDirectionsTransportType.Automobile
        var directions = MKDirections(request: directionsRequest)
        directions.calculateDirectionsWithCompletionHandler { (response:MKDirectionsResponse!, error: NSError!) -> Void in
            if error == nil {
                self.myRoute = response.routes[0] as? MKRoute
                self.mapView.addOverlay(self.myRoute?.polyline)
            }
        }
    }
    func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {

        var myLineRenderer = MKPolylineRenderer(polyline: myRoute?.polyline!)
        myLineRenderer.strokeColor = UIColor.redColor()
        myLineRenderer.lineWidth = 3
        return myLineRenderer
    }

}

我在模拟器中没有得到任何响应，我不确定我哪里出错了。我相信这是 swift 2. 任何指导将不胜感激。