BMKMapPoint point1 = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(38.085178, 114.502358));
BMKMapPoint point2 = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(38.085171, 114.502312));
CLLocationDistance distance = BMKMetersBetweenMapPoints(point1,point2);
NSLog(@"距离: %0.2f米", distance);
原文：http://www.cnblogs.com/zj901203/p/4690255.html