Adding subview to MKMapView that's above the map but below the annotation views?

Question

For an app I\'m building, I have a custom \"old map\" effect PNG that I\'d like to overlay on the MKMapView view. Unfortunately, neither way I\'ve tried to do this is exactly ri

Answer 1

I did something similar and in a different way in the end. I wanted to fade the mapview out by adding a white overlay, but I didn't want to fade the annotations. I added an overlay to the map (actually I had to add two as it didn't like me trying to add an overlay for the entire globe).

CLLocationCoordinate2D pt1, pt2, pt3, pt4;
pt1 = CLLocationCoordinate2DMake(85, 0);
pt2 = CLLocationCoordinate2DMake(85, 180);
pt3 = CLLocationCoordinate2DMake(-85, 180);
pt4 = CLLocationCoordinate2DMake(-85, 0);
CLLocationCoordinate2D coords[] = {pt1, pt2, pt3, pt4};
MKPolygon *p = [MKPolygon polygonWithCoordinates:coords count:4];
[self.mapView addOverlay:p];

pt1 = CLLocationCoordinate2DMake(85, 0);
pt2 = CLLocationCoordinate2DMake(85, -180);
pt3 = CLLocationCoordinate2DMake(-85, -180);
pt4 = CLLocationCoordinate2DMake(-85, 0);
CLLocationCoordinate2D coords2[] = {pt1, pt2, pt3, pt4};
MKPolygon *p2 = [MKPolygon polygonWithCoordinates:coords2 count:4];
[self.mapView addOverlay:p2];

Then you need to add the map delegate to draw them:

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id)overlay {
    if ([overlay isKindOfClass:MKPolygon.class]) {
        MKPolygonRenderer *polygonView = [[MKPolygonRenderer alloc] initWithOverlay:overlay];
        polygonView.fillColor = [UIColor colorWithRed:255.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:0.4];
        return polygonView;
    }
    return nil;
}