Draw polyline using google map in iOS 7? - iphone

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...
NSArray *routesArray = [res objectForKey:#"routes"];
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];
polyline.strokeColor = [UIColor greenColor];
polyline.strokeWidth = 10.f;
polyline.map = mapView_;
Can anyone know.Help me to solve this issue..

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.