iOS 7 supports standalone maps.
You just need to add tiles for a specific area.
The tile contains a map overlay, so we just need to add this overlay on the map.
For tiles, you need to calculate the area for which you need a standalone map, and then get that area from OpenStreetMaps .
What is it.
Detailed description Link for this.
After getting the idea from the tutorial, you can easily understand the structure of the map and move forward.
Greetings.
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