Drawing Route Between Two Places on GMSMapView in iOS

StackOverflow https://stackoverflow.com/questions/22550849

Question

I am Developing an iOS Application. In that Application i am having 2 Fields From and To. I Entered Address using Google Auto Complete API.and also i am able to Getting the Latitude and Longitude of the 2 places and able to show markers on the GMSMapView.

Now i Want to Draw Route Between these 2 Places. I found a solution when we use MKMapView. But i was Unable to find the solution for GMSMapView. please help me to Draw the route between these 2 points in GMSMapView.

If possible please give me some important links for this.

Thanks.

Was it helpful?

Solution 

`first get all points coordinates which are coming in route then add these points latitude and longitude in path in will draw path according to that`


GMSCameraPosition *cameraPosition=[GMSCameraPosition cameraWithLatitude:18.5203 longitude:73.8567 zoom:12];
_mapView =[GMSMapView mapWithFrame:CGRectZero camera:cameraPosition];
_mapView.myLocationEnabled=YES;
GMSMarker *marker=[[GMSMarker alloc]init];
marker.position=CLLocationCoordinate2DMake(18.5203, 73.8567);
marker.icon=[UIImage imageNamed:@"aaa.png"] ;
marker.groundAnchor=CGPointMake(0.5,0.5);
marker.map=_mapView;
GMSMutablePath *path = [GMSMutablePath path];   
[path addCoordinate:CLLocationCoordinate2DMake(@(18.520).doubleValue,@(73.856).doubleValue)];
[path addCoordinate:CLLocationCoordinate2DMake(@(16.7).doubleValue,@(73.8567).doubleValue)];

GMSPolyline *rectangle = [GMSPolyline polylineWithPath:path];
rectangle.strokeWidth = 2.f;
rectangle.map = _mapView;
self.view=_mapView;

OTHER TIPS

I've written the following code which should do the trick for you:

- (void)drawRoute
{
    [self fetchPolylineWithOrigin:myOrigin destination:myDestination completionHandler:^(GMSPolyline *polyline)
     {
         if(polyline)
             polyline.map = self.myMap;
     }];
}

- (void)fetchPolylineWithOrigin:(CLLocation *)origin destination:(CLLocation *)destination completionHandler:(void (^)(GMSPolyline *))completionHandler
{
    NSString *originString = [NSString stringWithFormat:@"%f,%f", origin.coordinate.latitude, origin.coordinate.longitude];
    NSString *destinationString = [NSString stringWithFormat:@"%f,%f", destination.coordinate.latitude, destination.coordinate.longitude];
    NSString *directionsAPI = @"https://maps.googleapis.com/maps/api/directions/json?";
    NSString *directionsUrlString = [NSString stringWithFormat:@"%@&origin=%@&destination=%@&mode=driving", directionsAPI, originString, destinationString];
    NSURL *directionsUrl = [NSURL URLWithString:directionsUrlString];


    NSURLSessionDataTask *fetchDirectionsTask = [[NSURLSession sharedSession] dataTaskWithURL:directionsUrl completionHandler:
         ^(NSData *data, NSURLResponse *response, NSError *error)
         {
             NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
             if(error)
             {
                 if(completionHandler)
                     completionHandler(nil);
                 return;
             }

             NSArray *routesArray = [json objectForKey:@"routes"];

             GMSPolyline *polyline = nil;
             if ([routesArray count] > 0)
             {
                 NSDictionary *routeDict = [routesArray objectAtIndex:0];
                 NSDictionary *routeOverviewPolyline = [routeDict objectForKey:@"overview_polyline"];
                 NSString *points = [routeOverviewPolyline objectForKey:@"points"];
                 GMSPath *path = [GMSPath pathFromEncodedPath:points];
                 polyline = [GMSPolyline polylineWithPath:path];
             }

             // run completionHandler on main thread                                           
             dispatch_sync(dispatch_get_main_queue(), ^{
                 if(completionHandler)
                      completionHandler(polyline);
             });
         }];
    [fetchDirectionsTask resume];
}

For swift 3 to draw polyline

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

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

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

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

                        guard let routes = json["routes"] as? NSArray else {
                            DispatchQueue.main.async {
                                self.activityIndicator.stopAnimating()
                            }
                            return
                        }

                        if (routes.count > 0) {
                            let overview_polyline = routes[0] as? NSDictionary
                            let dictPolyline = overview_polyline?["overview_polyline"] as? NSDictionary

                            let points = dictPolyline?.object(forKey: "points") as? String

                            self.showPath(polyStr: points!)

                            DispatchQueue.main.async {
                                self.activityIndicator.stopAnimating()

                                let bounds = GMSCoordinateBounds(coordinate: source, coordinate: destination)
                                let update = GMSCameraUpdate.fit(bounds, with: UIEdgeInsetsMake(170, 30, 30, 30))
                                self.mapView!.moveCamera(update)
                            }
                        }
                        else {
                            DispatchQueue.main.async {
                                self.activityIndicator.stopAnimating()
                            }
                        }
                    }
                }
                catch {
                    print("error in JSONSerialization")
                    DispatchQueue.main.async {
                        self.activityIndicator.stopAnimating()
                    }
                }
            }
        })
        task.resume()
    }

    func showPath(polyStr :String){
        let path = GMSPath(fromEncodedPath: polyStr)
        let polyline = GMSPolyline(path: path)
        polyline.strokeWidth = 3.0
        polyline.strokeColor = UIColor.red
        polyline.map = mapView // Your map view
    }

Note : You need to put googleDirection API key in URL.

If anyone is looking for a Swift 3.0 for @Tarek's answer, you can use this. This also use Alamofire and SwiftyJSON.

func drawPath()
{
    let origin = "\(currentLocation.latitude),\(currentLocation.longitude)"
    let destination = "\(destinationLoc.latitude),\(destinationLoc.longitude)"


    let url = "https://maps.googleapis.com/maps/api/directions/json?origin=\(origin)&destination=\(destination)&mode=driving&key=YOURKEY"

    Alamofire.request(url).responseJSON { response in
      print(response.request)  // original URL request
      print(response.response) // HTTP URL response
      print(response.data)     // server data
      print(response.result)   // result of response serialization

      let json = JSON(data: response.data!)
      let routes = json["routes"].arrayValue

      for route in routes
      {
        let routeOverviewPolyline = route["overview_polyline"].dictionary
        let points = routeOverviewPolyline?["points"]?.stringValue
        let path = GMSPath.init(fromEncodedPath: points!)
        let polyline = GMSPolyline.init(path: path)
        polyline.map = self.mapView
      }
    }
  }

Here's a Swift translation of johny kumar's answer.

let cameraPositionCoordinates = CLLocationCoordinate2D(latitude: 18.5203, longitude: 73.8567)
    let cameraPosition = GMSCameraPosition.cameraWithTarget(cameraPositionCoordinates, zoom: 12)

    let mapView = GMSMapView.mapWithFrame(CGRectZero, camera: cameraPosition)
    mapView.myLocationEnabled = true

    let marker = GMSMarker()
    marker.position = CLLocationCoordinate2DMake(18.5203, 73.8567)
    marker.groundAnchor = CGPointMake(0.5, 0.5)
    marker.map = mapView

    let path = GMSMutablePath()
    path.addCoordinate(CLLocationCoordinate2DMake(18.520, 73.856))
    path.addCoordinate(CLLocationCoordinate2DMake(16.7, 73.8567))

    let rectangle = GMSPolyline(path: path)
    rectangle.strokeWidth = 2.0
    rectangle.map = mapView

    self.view = mapView

- Swift 3.0 & XCode 8.0 Staright Line :(

let cameraPosition = GMSCameraPosition.camera(withLatitude: 18.5203, longitude: 73.8567, zoom: 12)
        self.mapView = GMSMapView.map(withFrame: CGRect.zero, camera: cameraPosition)
        self.mapView.isMyLocationEnabled = true
        let marker = GMSMarker()
        marker.position = CLLocationCoordinate2DMake(18.5203, 73.8567)
       // marker.icon = UIImage(named: "aaa.png")!
        marker.groundAnchor = CGPoint(x: 0.5, y: 0.5)
        marker.map = mapView
        let path = GMSMutablePath()
        path.add(CLLocationCoordinate2DMake(CDouble((18.520)), CDouble((73.856))))
        path.add(CLLocationCoordinate2DMake(CDouble((16.7)), CDouble((73.8567))))
        let rectangle = GMSPolyline.init(path: path)
        rectangle.strokeWidth = 2.0
        rectangle.map = mapView
        self.view = mapView

Make an URL request to Google Directions API and when you receive a JSON file go through all steps and decode the points objects.

I have made it with AlamoFire and SwiftyJson in xCode 8.3.3 and Swift 3.1. Put the drawing of the path in a function that needs two parameters only

a String origin example "48.7788,9.22222" and a String destination example "49.3212232,8.334151"

func drawPath (origin: String, destination: String) {
    /* set the parameters needed */ 
    String prefTravel = "walking" /* options are driving, walking, bicycling */
    String gmapKey = "Ask Google"
    /* Make the url */
    let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(origin)&destination=\(destination)&mode=\(prefTravel)&key=" + gmapKey)

    /* Fire the request */
    Alamofire.request(url!).responseJSON{(responseData) -> Void in
        if((responseData.result.value) != nil) {
            /* read the result value */
            let swiftyJsonVar = JSON(responseData.result.value!)
            /* only get the routes object */
            if let resData = swiftyJsonVar["routes"].arrayObject {
                let routes = resData as! [[String: AnyObject]]
                /* loop the routes */
                if routes.count > 0 {
                    for rts in routes {
                       /* get the point */
                       let overViewPolyLine = rts["overview_polyline"]?["points"]
                       let path = GMSMutablePath(fromEncodedPath: overViewPolyLine as! String)
                       /* set up poly line */
                       let polyline = GMSPolyline.init(path: path)
                       polyline.strokeWidth = 2
                       polyline.map = self.mapView
                    }
                }
            }
        }
    }
}

Hi You can use "LRouteController", it is a best way to show road route between two points like : 

[_routeController getPolyline With Locations: (Array of first and last location)]

Try it, I hope it will resolve your problem.

DirectionResponse from the Google Directions APIThe NSLogs are useful to see what you are working with.

[[GMDirectionService sharedInstance] getDirectionsFrom:origin to:destination          succeeded:^(GMDirection *directionResponse) {   
if ([directionResponse statusOK]){
    NSLog(@"Duration : %@", [directionResponse durationHumanized]);
    NSLog(@"Distance : %@", [directionResponse distanceHumanized]);
    NSArray *routes = [[directionResponse directionResponse] objectForKey:@"routes"];
    // NSLog(@"Route : %@", [[directionResponse directionResponse] objectForKey:@"routes"]);

    GMSPath *path = [GMSPath pathFromEncodedPath:routes[0][@"overview_polyline"]  [@"points"]];
    GMSPolyline *polyline = [GMSPolyline polylineWithPath:path];
    polyline.strokeColor = [UIColor redColor];
    polyline.strokeWidth = 5.f;
    polyline.map = mapView;

}
} failed:^(NSError *error) {
    NSLog(@"Can't reach the server")
}];

As you know get directions and routes from google is NOT FREE and last year google changed their api calls prices a lot! So it may not suitable for everyone. So if you have all key coordinates and just want to connect them together, you can use the following.

- Swift 4 Extensions

Make path with coordinates:

extension GMSMutablePath {
    convenience init(coordinates: [CLLocationCoordinate2D]) {
        self.init()
        for coordinate in coordinates {
            add(coordinate)
        }
    }
}

Add path to map:

extension GMSMapView {
    func addPath(_ path: GMSPath, strokeColor: UIColor? = nil, strokeWidth: CGFloat? = nil, geodesic: Bool? = nil, spans: [GMSStyleSpan]? = nil) {
        let line = GMSPolyline(path: path)
        line.strokeColor = strokeColor ?? line.strokeColor
        line.strokeWidth = strokeWidth ?? line.strokeWidth
        line.geodesic = geodesic ?? line.geodesic
        line.spans = spans ?? line.spans
        line.map = self
    }
}

Usage:

let path = GMSMutablePath(coordinates: [<#Coordinates#>])
mapView.addPath(path)
  • NOTE: You can create exact same line as google just once using tools out there or even google itself, store it somewhere and give it to your client as need.

Swift 5 Its working fine for me

View will appear

self.drawMap(SourceCordinate: CLLocationCoordinate2D(latitude: lat, longitude: long), destinationcordinate: CLLocationCoordinate2D(latitude: latitude, longitude: longitude))



func drawMap(SourceCordinate : CLLocationCoordinate2D, destinationcordinate :CLLocationCoordinate2D)
    {
        self.mapView.clear()
        let str = String(format:"https://maps.googleapis.com/maps/api/directions/json?origin=\(SourceCordinate.latitude),\(SourceCordinate.longitude)&destination=\(destinationcordinate.latitude),\(destinationcordinate.longitude)&key=\(googleServiceKey)")
        print(str)
        Alamofire.request(str).responseJSON { (responseObject) -> Void in
            let resJson = JSON(responseObject.result.value!)
            print(resJson)
            let routes : NSArray = resJson["routes"].rawValue as! NSArray
            if(resJson["status"].rawString()! == "ZERO_RESULTS"){}
            else if(resJson["status"].rawString()! == "NOT_FOUND"){}
            else if routes.count == 0{}
            else{
                let routes : NSArray = resJson["routes"].rawValue as! NSArray
//                let position = CLLocationCoordinate2D(latitude: SourceCordinate.latitude, longitude: SourceCordinate.longitude)
                let markerEnd = GMSMarker()
                markerEnd.position = CLLocationCoordinate2D(latitude: self.latitude, longitude: self.longitude)
                markerEnd.map = self.mapView
                let pathv : NSArray = routes.value(forKey: "overview_polyline") as! NSArray
                let paths : NSArray = pathv.value(forKey: "points") as! NSArray
                let newPath = GMSPath.init(fromEncodedPath: paths[0] as! String)
                let polyLine = GMSPolyline(path: newPath)
                polyLine.strokeWidth = 5
                polyLine.strokeColor =  .black
                let ThemeOrange = GMSStrokeStyle.solidColor( .blue)
                let OrangeToBlue = GMSStrokeStyle.gradient(from:  .blue, to:  .blue)
                polyLine.spans = [GMSStyleSpan(style: ThemeOrange),
                                  GMSStyleSpan(style: ThemeOrange),
                                  GMSStyleSpan(style: OrangeToBlue)]
                polyLine.map = self.mapView

            }
        }
    }
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