ios通过经纬度计算两个之间的距离
+(double)distanceBetweenOrderBy:(double)lat1 :(double)lat2 :(double)lng1 :(double)lng2{ double dd = M_PI/180; double x1=lat1*dd,x2=lat2*dd; double y1=lng1*dd,y2=lng2*dd; double R = 6371004; double distance = (2*R*asin(sqrt(2-2*cos(x1)*cos(x2)*cos(y1-y2) - 2*sin(x1)*sin(x2))/2)); //km 返回 // return distance*1000; //返回 m return distance; }