IPhone : ios development - getting total number of active app users

on Sunday, February 22, 2015

I am new to ios development and I want to know:


What is the best way to get the total number of users who have the app up (or up in the background of their phone) in order to get their gps location?


I have a mapping application that revolves around other people using the app and I need to know the best way to 'ping' the app users location.


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