KMLViewer in iOS

Question

I am testing Apple's KMLViewer software and I was wondering If I could use it to find in which country x,y coordinates belongs. My KML file has all the data for all countries. (Polygons, overlay..).

Answer 1

If you've already created your MKPolygon overlays, and your MKMapView has created the MKPolygonView views in your mapView:viewForOverlay:, and if you're just trying to see if a tap gesture is in a particular MKPolygonView, I think you can do the following:

- (void)handleTap:(UITapGestureRecognizer *)gesture
{
    BOOL success = NO;

    CGPoint location = [gesture locationInView:self.mapView];
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView];
    MKMapPoint mapPoint = MKMapPointForCoordinate(coordinate);

    for (id<MKOverlay> overlay in self.mapView.overlays)
    {
        MKOverlayView *overlayView = [self.mapView viewForOverlay:overlay];
        if ([overlayView isKindOfClass:[MKPolygonView class]])
        {
            MKPolygon *polygon = (MKPolygon *)overlay;
            MKPolygonView *polygonView = (MKPolygonView *)overlayView;
            CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];
            if (CGPathContainsPoint([polygonView path], NULL, polygonViewPoint, NO))
            {
                NSLog(@"Overlay '%@' contains point %@", polygon.title, NSStringFromCGPoint(location));
                success = YES;
                break;
            }
        }
    }

    if (!success)
        NSLog(@"No overlays contained point %@", NSStringFromCGPoint(location));
}