I have two questions. In my app, I am getting the GPS coordinates of friends. How can I determine if those friends are in the US/Canada?
The second question is to find out if the actual device is in the US/Canada?
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I have two questions. In my app, I am getting the GPS coordinates of friends. How can I determine if those friends are in the US/Canada?
The second question is to find out if the actual device is in the US/Canada?
The term for this is Reverse Geocoding. You want to have a look at the MKReverseGeocoder class and its sample code, this is Apple’s solution for this. However, it requires you to display a map (which may or may not be what you want).
If you don’t want the map then things get a little bit more complicated. See Offline Reverse Geocoding at Country Level and Techniques for offline reverse geocoding on a mobile device?.