IOS调用导航

#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
- (IBAction)touchDaohang:(id)sender {
    if (SYSTEM_VERSION_LESS_THAN(@"6.0")) { // ios6以下，调用google map
        NSString *urlString = [[NSString alloc] initWithFormat:@"http://maps.google.com/maps?saddr=34.123,113.122&daddr=34.111,113.222&dirfl=d"];
        NSURL *aURL = [NSURL URLWithString:urlString];
        [[UIApplication sharedApplication] openURL:aURL];
    } else { // 直接调用ios自己带的apple map
        CLLocationCoordinate2D to;
        to.latitude = 34.765;
        to.longitude = 113.714;
        MKMapItem *currentLocation = [MKMapItem mapItemForCurrentLocation];
        MKMapItem *toLocation = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithCoordinate:to addressDictionary:nil] ];
        //toLocation.name = _end.streetAddres;
        [MKMapItem openMapsWithItems:[NSArray arrayWithObjects:currentLocation, toLocation, nil]
                       launchOptions:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:MKLaunchOptionsDirectionsModeWalking, [NSNumber numberWithBool:YES], nil]
                                                                 forKeys:[NSArray arrayWithObjects:MKLaunchOptionsDirectionsModeKey, MKLaunchOptionsShowsTrafficKey, nil]]];
    }
}