setNeedsDisplay(_:zoomScale:)
Invalidates the specified portion of the overlay, but only at the specified zoom scale.
Declaration
func setNeedsDisplay(_ mapRect: MKMapRect, zoomScale: MKZoomScale)Parameters
- mapRect:
The portion of the overlay to update. Specify this value using a map coordinates.
- zoomScale:
The zoom scale for which you want to invalidate the overlay.
Discussion
Marking a rectangle as invalid causes that portion of the overlay to be redrawn during the next update cycle. This method invalidates the overlay only at the specified zoom scale.