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copied!<p>With what incanus said with <code>MKTileOverlay</code>, it is like this in the view controller:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; NSString *tileTemplate = @"http://tile.stamen.com/watercolor/{z}/{x}/{y}.jpg"; MKTileOverlay *overlay = [[MKTileOverlay alloc] initWithURLTemplate:tileTemplate]; overlay.canReplaceMapContent = YES; [self.mapView addOverlay:overlay]; [self.mapView setCenterCoordinate:CLLocationCoordinate2DMake(37.54827, -121.98857)]; self.mapView.delegate = self; } -(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay { MKTileOverlayRenderer *renderer = [[MKTileOverlayRenderer alloc] initWithOverlay:overlay]; return renderer; } </code></pre> <p>If you need control over how the overlay feeds the data, you need to subclass <code>MKTileOverlay</code> and override <code>loadTileAtPath:result:</code></p> <pre><code>-(void)loadTileAtPath:(MKTileOverlayPath)path result:(void (^)(NSData *, NSError *))result { NSData *tile = [self someHowGetTileImageIntoNSDataBaseOnPath:path]; if (tile) { result(tile, nil); } else { result(nil, [NSError errorWithDomain: CUSTOM_ERROR_DOMAIN code: 1 userInfo:nil]); } } </code></pre> <p>The <code>MKOverlay</code> protocol requires <code>boundingMapRect:</code>, which should returns MKMapRect for the rectangular region that this overlay covers. However, I personally found that if I override it myself, it voids the prior <code>canReplaceMapContent = YES</code> setting as Apple probably does not like to show a blank gray map. So I just let MKTileMapOverlay handles it instead.</p> <p>If your overlay is not actually tiles, then MKTileOverlay does not really apply. But I think you probably can fake it but always reporting nil data within <code>loadTileAtPath:result:</code>, and add your real overlay via another overlay. Another option would be just cover the whole world with <a href="https://stackoverflow.com/questions/8679499/showing-specific-region-using-mapkit/8683569#8683569">black polygon overlay</a>, but then the unsuspecting user would possibly be unknowingly streaming more data than he/she likes.</p>

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