How to draw routes between two locations in google maps iOS swift

Question

I\'m using google maps in my iOS swift project. I want to draw a path between two locations on the map (Not straight line). Any idea how to do that ?

Answer 1

Above all answers can draw routes but there is a way that you can draw accurate route using directions API.Here is the code hopefully it will help for you.

func getRouteSteps(from source: CLLocationCoordinate2D, to destination: CLLocationCoordinate2D) {

    let session = URLSession.shared

    let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(source.latitude),\(source.longitude)&destination=\(destination.latitude),\(destination.longitude)&sensor=false&mode=driving&key=\(Your_API_Key)")!

    let task = session.dataTask(with: url, completionHandler: {
        (data, response, error) in

        guard error == nil else {
            print(error!.localizedDescription)
            return
        }

        guard let jsonResult = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] else {

            print("error in JSONSerialization")
            return

        }



        guard let routes = jsonResult["routes"] as? [Any] else {
            return
        }

        guard let route = routes[0] as? [String: Any] else {
            return
        }

        guard let legs = route["legs"] as? [Any] else {
            return
        }

        guard let leg = legs[0] as? [String: Any] else {
            return
        }

        guard let steps = leg["steps"] as? [Any] else {
            return
        }
          for item in steps {

            guard let step = item as? [String: Any] else {
                return
            }

            guard let polyline = step["polyline"] as? [String: Any] else {
                return
            }

            guard let polyLineString = polyline["points"] as? String else {
                return
            }

            //Call this method to draw path on map
            DispatchQueue.main.async {
                self.drawPath(from: polyLineString)
            }

        }
    })
    task.resume()
}

And then

    //MARK:- Draw Path line
func drawPath(from polyStr: String){
    let path = GMSPath(fromEncodedPath: polyStr)
    let polyline = GMSPolyline(path: path)
    polyline.strokeWidth = 3.0
    polyline.map = mapView // Google MapView


    let cameraUpdate = GMSCameraUpdate.fit(GMSCoordinateBounds(coordinate: sourceLocationCordinates, coordinate: destinationLocationCordinates))
    mapView.moveCamera(cameraUpdate)
    let currentZoom = mapView.camera.zoom
    mapView.animate(toZoom: currentZoom - 1.4)
}

Note: I have added sourcesLocationCordinates and destinationLocationCordinates variables.Don't forget to replace them with your source and destination.Hopefully this will help you making perfect route line.