MKDirections - Draw a route from location A to location B

Updated with Xcode 8.0 (Swift 3) on September 19, 2016.
Updated with Xcode 7.3.1 (Swift 2.2) on June 15, 2016.
Updated as a simple tutorial on May 25, 2015.

1. Disable 'Use Auto Layout' in the storyboard file inspector.

2. Drag a MapKit View to the storyboard.

3. Control-drag the MapKit View from the storyboard to ViewController.swift. Name the MapKit 'myMap'.

The result is:

@IBOutlet weak var myMap: MKMapView!

4. Complete the code as below:

Update (September 19, 2016): Xcode 8.0 (Swift 3)

import UIKit

import MapKit

class ViewController: UIViewController, MKMapViewDelegate {

    @IBOutlet weak var myMap: MKMapView!

    

    var myRoute : MKRoute!

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        let point1 = MKPointAnnotation()

        let point2 = MKPointAnnotation()

        

        point1.coordinate = CLLocationCoordinate2DMake(25.0305, 121.5360)

        point1.title = "Taipei"

        point1.subtitle = "Taiwan"

        myMap.addAnnotation(point1)

        

        point2.coordinate = CLLocationCoordinate2DMake(24.9511, 121.2358)

        point2.title = "Chungli"

        point2.subtitle = "Taiwan"

        myMap.addAnnotation(point2)

        myMap.centerCoordinate = point2.coordinate

        myMap.delegate = self

        

        //Span of the map

        myMap.setRegion(MKCoordinateRegionMake(point2.coordinate, MKCoordinateSpanMake(0.7,0.7)), animated: true)

        

        let directionsRequest = MKDirectionsRequest()

        let markTaipei = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point1.coordinate.latitude, point1.coordinate.longitude), addressDictionary: nil)

        let markChungli = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point2.coordinate.latitude, point2.coordinate.longitude), addressDictionary: nil)

        

        directionsRequest.source = MKMapItem(placemark: markChungli)

        directionsRequest.destination = MKMapItem(placemark: markTaipei)

        

        directionsRequest.transportType = MKDirectionsTransportType.automobile

        let directions = MKDirections(request: directionsRequest)

        

        directions.calculate(completionHandler: {

            response, error in

            

            if error == nil {

                self.myRoute = response!.routes[0] as MKRoute

                self.myMap.add(self.myRoute.polyline)

            }

            

        })

    }

    

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {

        

        let myLineRenderer = MKPolylineRenderer(polyline: myRoute.polyline)

        myLineRenderer.strokeColor = UIColor.red

        myLineRenderer.lineWidth = 3

        return myLineRenderer

    }

    

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}

======

Update (June 15, 2016): Xcode 7.3.1 (Swift 2.2)

import UIKit

import MapKit

class ViewController: UIViewController, MKMapViewDelegate {

    

    @IBOutlet weak var myMap: MKMapView!

    

    var myRoute : MKRoute!

    

    override func viewDidLoad() {

        super.viewDidLoad()

        let point1 = MKPointAnnotation()

        let point2 = MKPointAnnotation()

        

        point1.coordinate = CLLocationCoordinate2DMake(25.0305, 121.5360)

        point1.title = "Taipei"

        point1.subtitle = "Taiwan"

        myMap.addAnnotation(point1)

        

        point2.coordinate = CLLocationCoordinate2DMake(24.9511, 121.2358)

        point2.title = "Chungli"

        point2.subtitle = "Taiwan"

        myMap.addAnnotation(point2)

        myMap.centerCoordinate = point2.coordinate

        myMap.delegate = self

        

        //Span of the map

        myMap.setRegion(MKCoordinateRegionMake(point2.coordinate, MKCoordinateSpanMake(0.7,0.7)), animated: true)

        

        let directionsRequest = MKDirectionsRequest()

        let markTaipei = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point1.coordinate.latitude, point1.coordinate.longitude), addressDictionary: nil)

        let markChungli = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point2.coordinate.latitude, point2.coordinate.longitude), addressDictionary: nil)

        

        directionsRequest.source = MKMapItem(placemark: markChungli)

        directionsRequest.destination = MKMapItem(placemark: markTaipei)

        directionsRequest.transportType = MKDirectionsTransportType.Automobile

        let directions = MKDirections(request: directionsRequest)

        directions.calculateDirectionsWithCompletionHandler({

            response, error in

            

            if error == nil {

                self.myRoute = response!.routes[0] as MKRoute

                self.myMap.addOverlay(self.myRoute.polyline)

            }

        

        })

    }

    

    func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {

        

        let myLineRenderer = MKPolylineRenderer(polyline: myRoute.polyline)

        myLineRenderer.strokeColor = UIColor.redColor()

        myLineRenderer.lineWidth = 3

        return myLineRenderer

    }

    

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}

======

Previous Post (May 25, 2015):
import UIKit

import MapKit

import CoreLocation

class ViewController: UIViewController, MKMapViewDelegate {

    @IBOutlet weak var myMap: MKMapView!

    

    var myRoute : MKRoute?

    

    override func viewDidLoad() {

        super.viewDidLoad()

        var point1 = MKPointAnnotation()

        var point2 = MKPointAnnotation()

        

        point1.coordinate = CLLocationCoordinate2DMake(25.0305, 121.5360)

        point1.title = "Taipei"

        point1.subtitle = "Taiwan"

        myMap.addAnnotation(point1)

        

        point2.coordinate = CLLocationCoordinate2DMake(24.9511, 121.2358)

        point2.title = "Chungli"

        point2.subtitle = "Taiwan"

        myMap.addAnnotation(point2)

        myMap.centerCoordinate = point2.coordinate

        myMap.delegate = self

        

        //Span of the map

        myMap.setRegion(MKCoordinateRegionMake(point2.coordinate, MKCoordinateSpanMake(0.7,0.7)), animated: true)

        

        var directionsRequest = MKDirectionsRequest()

        let markTaipei = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point1.coordinate.latitude, point1.coordinate.longitude), addressDictionary: nil)

        let markChungli = MKPlacemark(coordinate: CLLocationCoordinate2DMake(point2.coordinate.latitude, point2.coordinate.longitude), addressDictionary: nil)

        

        directionsRequest.setSource(MKMapItem(placemark: markChungli))

        directionsRequest.setDestination(MKMapItem(placemark: markTaipei))

        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.myMap.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

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}

5. The result: