Multiple route between two location in iPhone - ios

Question

I need to show multiple routes in my iOS application that uses Maps API.
I am able to draw single route but how I can draw multiple routes?
I am using google direction api to get single route
http://maps.googleapis.com/maps/api/directions/json?origin=28.6353080000,77.2249600000&destination=28.5355161000,77.3910265000&mode=walking&sensor=false
Also in ios 5 Native Map application of iPhone show two popup saying Route1 and Route two and when user touch that selected route get highlighted .So can we also do same??

Answer 1

alternatives (optional), if set to
true, specifies that the Directions
service may provide more than one
route alternative in the response.
Note that providing route alternatives
may increase the response time from
the server.
From The Google Directions API
You need to add in your query link alternatives=true
see: Find the number of routes between two places

Answer 2

Here is Code
write this code
#pragma mark - MapView Delegate
//-----------------------------------------------------------------------
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {
// [self.mapView removeAnnotation:self.annotation];
NSString *baseUrl = [NSString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=true", self.mapView.userLocation.location.coordinate.latitude, self.mapView.userLocation.location.coordinate.longitude, [[self.dictData valueForKey:#"latitude"]doubleValue],[[self.dictData valueForKey:#"longitude"]doubleValue]];
NSURL *url = [NSURL URLWithString:[baseUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSError *error = nil;
NSDictionary *result = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
NSArray *routes = [result objectForKey:#"routes"];
NSDictionary *firstRoute = [routes objectAtIndex:0];
NSDictionary *leg = [[firstRoute objectForKey:#"legs"] objectAtIndex:0];
NSDictionary *end_location = [leg objectForKey:#"end_location"];
double latitude = [[end_location objectForKey:#"lat"] doubleValue];
double longitude = [[end_location objectForKey:#"lng"] doubleValue];
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude);
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = coordinate;
point.title = [leg objectForKey:#"end_address"];
point.subtitle = #"Event Destinations !!!";
[self.mapView addAnnotation:point];
NSArray *steps = [leg objectForKey:#"steps"];
int stepIndex = 0;
CLLocationCoordinate2D stepCoordinates[1 + [steps count] + 1];
stepCoordinates[stepIndex] = userLocation.coordinate;
for (NSDictionary *step in steps) {
NSDictionary *start_location = [step objectForKey:#"start_location"];
stepCoordinates[++stepIndex] = [self coordinateWithLocation:start_location];
if ([steps count] == stepIndex){
NSDictionary *end_location = [step objectForKey:#"end_location"];
stepCoordinates[++stepIndex] = [self coordinateWithLocation:end_location];
}
}
MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:stepCoordinates count:1 + stepIndex];
[self.mapView addOverlay:polyLine];
}];
}
#pragma mark - Custom Methods
//-----------------------------------------------------------------------
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {
MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
polylineView.strokeColor = [UIColor colorWithRed:204/255. green:45/255. blue:70/255. alpha:1.0];
polylineView.lineWidth = 10.0;
return polylineView;
}