iOS - MapKit and navigation from a location to another

Question

my question is about the mapkit in the iOS SDK. Is it possible to draw routes from a location to another? Is there any built-in API? If no, how can I do? Thanks

Answer 1

In iOS 7, there is an API for getting the direction from a location to another called MKDirection . You can call -[MKDirection calculateDirectionsWithCompletionHandler:] method for that. This method's argument is MKDirectionsHandler block which contains the MKDirectionsResponse . The MKDirectionsResponse contains the routes data which is array of MKRoute . In each MKRoute there is a polyline ( MKPolyline ) which you can add these polyline as overlays to the MKMapView .

Answer 2

MKDirections allows you to find routes between two locations and MapKit allows you to add this routes as an overlay.

func drawRoutes(sourceLocation:CLLocationCoordinate2D , 
destinationLocation:CLLocationCoordinate2D)
{

    let sourcePlacemark = MKPlacemark(coordinate: sourceLocation, addressDictionary: nil)
    let destinationPlacemark = MKPlacemark(coordinate: destinationLocation, addressDictionary: nil)


    let sourceMapItem = MKMapItem(placemark: sourcePlacemark)
    let destinationMapItem = MKMapItem(placemark: destinationPlacemark)


    let directionRequest = MKDirectionsRequest()
    directionRequest.source = sourceMapItem
    directionRequest.destination = destinationMapItem
    directionRequest.transportType = .automobile


    let directions = MKDirections(request: directionRequest)


    directions.calculate {
        (response, error) -> Void in

        guard let response = response else {
            if let error = error {
                print("Error: \(error)")
            }

            return
        }

        let route = response.routes[0]
        self.mapView.add((route.polyline), level: MKOverlayLevel.aboveRoads)

        let rect = route.polyline.boundingMapRect
        self.mapView.setRegion(MKCoordinateRegionForMapRect(rect), animated: true)
    }
}