导航线路 (系统地图)

gistfile1.m

    Class itemClass = [MKMapItem class];
    if (itemClass && [itemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)]) {
        // iOS 6 MKMapItem available
        MKPlacemark* place = [[MKPlacemark alloc] initWithCoordinate:CLLocationCoordinate2DMake(lat, lng) addressDictionary:nil];
        MKMapItem* destination = [[MKMapItem alloc] initWithPlacemark:place];
        destination.name = addrName;
        NSArray *items = @[destination];
        NSDictionary* options = @{ MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving};
        [MKMapItem openMapsWithItems:items launchOptions:options];
    } else {
        // use pre iOS 6 technique
        NSString *addr = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f", [[MLUser currentUser] ulatitude], [[MLUser currentUser] ulongitude], lat, lng];
        // NSString *addr = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%f,%f&daddr=Current Location",lat, lng];
        NSURL *url = [[NSURL alloc] initWithString:[addr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
        [[UIApplication sharedApplication] openURL:url];
    }