使用CLLocation计算距离iOS MapKit

Question

我试图用纬度和经度找到以英里为单位的距离.我有以下方法:

- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation
{
    if(!newLocation) return; 

    if ((oldLocation.coordinate.latitude != newLocation.coordinate.latitude) &&
        (oldLocation.coordinate.longitude != newLocation.coordinate.longitude))
    {



        CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:oldLocation.coordinate.latitude longitude:oldLocation.coordinate.longitude];
        CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.latitude];

        CLLocationDistance distance = ([loc2 distanceFromLocation:loc1]) * 0.000621371192;

        //distance = distance; 

        NSLog(@"Total Distance %f in miles",distance);
    }

}

由于某种原因,它打印出类似5678.32英里的东西.这个位置非常固定,根本不动.

Answer 1

CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.(!!!!!)latitude longitude:newLocation.coordinate.(!!!!!)latitude];