I have a custom MKTileOverlay in my iOS project using MapKit, it works fine most of the time. However, after zooming in/out a few times and panning the map some of the tiles are not being drawn. A...

I have a big need to do an offline map for my app, as it is made mostly for Thailand, where internet connection is often hard to come by. I am using OpenStreetMap right now for my MKTileOverlay but...