Possible Duplicate:
GPS coordinates in degrees to calculate distances
How to Calculate distance between two place using latitude-longitude in gmap for iPhone? Calculate distance between two place using latitude-longitude in gmap for iPhone
You have to use Core Location Framework. So don't forget to Add & import Core Location Framework.
#import <CoreLocation/CoreLocation.h>
CLLocation *locA = [[CLLocation alloc] initWithLatitude:lat1 longitude:long1];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:lat2 longitude:long2];
CLLocationDistance distance = [locA distanceFromLocation:locB];
//distance in Meters
//1 meter == 100 centimeter
//1 meter == 3.280 feet
//1 square meter == 10.76 square feet
[locA release];
[locB release];
import CoreLocation
let locA = CLLocation(latitude: lat1, longitude: long1)
let locB = CLLocation(latitude: lat2, longitude: long2)
let distance = locA.distance(from: locB)