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

This piece of code will work right for you. Don't forget to change your API key and mode (walking, driving).

func draw(src: CLLocationCoordinate2D, dst: CLLocationCoordinate2D){

    let config = URLSessionConfiguration.default
    let session = URLSession(configuration: config)

    let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(src.latitude),\(src.longitude)&destination=\(dst.latitude),\(dst.longitude)&sensor=false&mode=walking&key=**YOUR_KEY**")!

    let task = session.dataTask(with: url, completionHandler: {
        (data, response, error) in
        if error != nil {
            print(error!.localizedDescription)
        } else {
            do {
                if let json : [String:Any] = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] {

                    let preRoutes = json["routes"] as! NSArray
                    let routes = preRoutes[0] as! NSDictionary
                    let routeOverviewPolyline:NSDictionary = routes.value(forKey: "overview_polyline") as! NSDictionary
                    let polyString = routeOverviewPolyline.object(forKey: "points") as! String

                    DispatchQueue.main.async(execute: {
                        let path = GMSPath(fromEncodedPath: polyString)
                        let polyline = GMSPolyline(path: path)
                        polyline.strokeWidth = 5.0
                        polyline.strokeColor = UIColor.green
                        polyline.map = mapView    
                    })
                }

            } catch {
                print("parsing error")
            }
        }
    })
    task.resume()
}