To find out the country of the user please use the code below:
1- Add the coreLocation Framework to your project and import #import <corelocation corelocation.h="">
2- Set the CLLocationManagerDelegate as UIViewController

@interface LocationViewController : UIViewController<CLLocationManagerDelegate>
    {
        CLLocationManager *locationManager;
       CLGeocoder *geocoder;
        CLPlacemark *placemark;
    }

3- And in LocationViewController.m file use the code below.

- (void)viewDidLoad {

    locationManager = [[CLLocationManager alloc] init];

    locationManager.delegate = self;

    if([[[UIDevice currentDevice]systemVersion] floatValue]>=8.0?YES:NO)
    {
        [locationManager requestAlwaysAuthorization];

    }

    geocoder = [[CLGeocoder alloc] init];
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; 

    [locationManager startUpdatingLocation];
}


- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{

    CLLocation *currentLocation = newLocation;

    if (currentLocation != nil) {


        [geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) {

            if (error == nil && [placemarks count] > 0) {
                placemark = [placemarks lastObject];
                NSLog(@"user contry==%@",placemark.country);


            } else {
                NSLog(@"%@", error.debugDescription);
            }
        } ];
    }

    [locationManager stopUpdatingLocation];


}