If you want to use Offline Maps in your iOS application, this is an example on how you could do it. We use the route-me framework with a sqlite database of the map information.
- See how to download the tiles. https://github.com/Label305/iOS-OfflineMaps-Example/wiki/Download-tiles
- See how to create a sqlite database of the tiles. https://github.com/Label305/iOS-OfflineMaps-Example/wiki/Create-database-of-tiles