CoreLocation的两个坐标之间的距离
问题描述：
我需要计算两个坐标之间的距离（以米和英里为单位）
I need to calculate the distance (in meters and miles) between two coordinates given
我该怎么做？
答
返回从接收器坐标到指定位置坐标的距离（以米为单位）。
Returns the distance (in meters) from the receiver’s coordinate to the coordinate of the specified location.
// Deprecated in iOS 3.2 method
- (CLLocationDistance)getDistanceFrom:(const CLLocation *)location
// Correct method
- (CLLocationDistance)distanceFromLocation:(const CLLocation *)location