计算两地距离多少公里或者英里

CLLocation *lastLocation = [[CLLocation alloc] initWithLatitude:coords.latitude longitude:coords.longitude];

  CLLocation *nowLocation = [[CLLocation alloc] initWithLatitude:location.coordinate.latitude longitude:location.coordinate.longitude];

     int distanceMeters = [lastLocation distanceFromLocation:nowLocation];

                if(appDelegate.isKMOrMILE == 0)

                {

                    [cardistanceLabel setText:[NSString stringWithFormat:@"%d KM",distanceMeters/1000]];//公里

                }

                else if(appDelegate.isKMOrMILE == 1)

                {

                    int data = (distanceMeters/1000)/1.6093;

                    [cardistanceLabel setText:[NSString stringWithFormat:@"%d MILE",data]];//英里

                }