Adding a route to a MKMapView

Question

I\'m trying to add a routing feature to an app I\'m working on. I found Craig Spitzkoff\'s article on how to draw lines on an MKMapView which works pretty good.

Answer 1

I know this is an old question, but nowadays you can also use MapKit’s MKDirections. For example, here’s a routine to search for some searchString and then add directions to the first hit on to your map view:

let request = MKLocalSearch.Request()
request.region = mapView.region
request.naturalLanguageQuery = searchString

let search = MKLocalSearch(request: request)
search.start { response, _ in
    guard let mapItem = response?.mapItems.first else { return }

    let request = MKDirections.Request()
    request.source = MKMapItem.forCurrentLocation()
    request.destination = mapItem
    let directions = MKDirections(request: request)
    directions.calculate { response, error in
        guard let routes = response?.routes else { return }

        let overlays = routes.map { $0.polyline }
        self.mapView.addOverlays(overlays)
    }
}

To make sure this is rendered on your map, you would make sure to set your map view’s delegate property (either in IB or programmatically) and then implement mapView(_:rendererFor:):

extension MapViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        let renderer = MKPolylineRenderer(overlay: overlay)
        renderer.strokeColor = .init(red: 0, green: 0, blue: 1, alpha: 0.7)
        return renderer
    }
}