Draw polyline using google map in iOS 7?

Question

Using this link .

i tried to get route direction from one coordinates to another coordinates but didn\'t get route. Below mention used coding...

Answer 1

You can use GoogleMapsDirection to get the path or DirectionResponse from the Google Directions API. The 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"]);

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

Once you have the json you can get the path points (this shows the first route at index 0).

GMSPath *path = [GMSPath pathFromEncodedPath:routes[0][@"overview_polyline"][@"points"]];

Then you can convert the path to a polyline and draw it on your mapView and set the strokeColor and strokeWidth if desired.

GMSPolyline *polyline = [GMSPolyline polylineWithPath:path];
polyline.strokeColor = [UIColor redColor];
polyline.strokeWidth = 5.f;

Then set the polyline.map property to your mapView.

polyline.map = mapView;

Finally put it all together

[[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")
}];

I find CocoaPods useful for installing the Google Maps SDK and GoogleMapsDirection.