gistfile1.txt

- (void)test {
    if ([[UIApplication sharedApplication] canOpenURL: [NSURL URLWithString: @"comgooglemaps-x-callback://"]]) {
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString: [NSString stringWithFormat:@"comgooglemaps-x-callback://?saddr=%@,%@&daddr=%@,%@&", @"18.9750", @"72.8258", @"23.0300",@"72.5800"]]];
    } else {
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString: [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%@,%@&daddr=%@,%@", @"18.9750", @"72.8258", @"23.0300",@"72.5800"]]];
    }

}