// do something here

- (void)launchMaps:(NSString *)serviceAddress
{
    NSString *currentLocation = @"Current+Location";
 
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0"))
    {
        // use MapKit to handle launching Maps app instead of pushing a URL
        CLGeocoder *geocoder = [[CLGeocoder alloc] init];
        [geocoder geocodeAddressString:serviceAddress completionHandler:^(NSArray *placemarks, NSError *error) {
            if (error)
            {
                NSLog(@"Geocode failed with error: %@", error.localizedDescription);
                return;
            }
 
            if (placemarks && placemarks.count > 0)
            {
                CLPlacemark *pl = placemarks[0];
                CLLocation *loc = pl.location;
                NSLog(@"Geocoded latitude: %f; longitude: %f", loc.coordinate.latitude, loc.coordinate.longitude);
                MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:loc.coordinate addressDictionary:nil];
                MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark];
                mapItem.name = @"Whatever name you want goes here";
                mapItem.phoneNumber = @"And if you have a phone number, it would go here";
                NSArray *mapItemArray = @[ mapItem ];
                NSDictionary *launchOpt = @{ MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving };
                [MKMapItem openMapsWithItems:mapItemArray launchOptions:launchOpt];
                [mapItem release];
                [placemark release];
            }
        }];
 
        [geocoder release];
        return;
    }
 
    NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%@&daddr=%@", currentLocation, serviceAddress];
    NSString *escaped = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:escaped]];
}

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)