Location Services iPhone

Question

what is the best way to determine if two iPhone users are in the same radius of lets say 1000 meters.

What I am thinking is, both phones find out there location, then submit it to a central server. The problem is how would I figure out if they are within a certain distance of each other.

Answer 1

使用服务器上的Haversine公式可以粗略估算距离，并仅提供最接近客户电话的4或5，然后使用CLLocation上的distanceFromLocation:方法（仅发送几条记录）即可获得更准确的距离由服务器。