Annotations are not adding on Map

I am trying to add multiple annotations on Map using this code.

 - (void)showOnMap {   
     sharedRequest = [RequestHandler sharedRquest];

     for (int i=0 ; i<[sharedRequest.dataArray count] ; i++) {

         NSMutableDictionary * location = [[[sharedRequest.dataArray objectAtIndex:i]objectForKey:@"geometry"]objectForKey:@"location"];
        double lat = [[location objectForKey:@"lat"]doubleValue];
         double lng = [[location objectForKey:@"lng"]doubleValue];

         CLLocationCoordinate2D coord = {lat,lng};
         MKPointAnnotation *point = [[MKPointAnnotation alloc]init];
         point.coordinate = coord;
         [self.mapView addAnnotation:point];
     }
     [_spinner stopAnimating]; 
}

EDIT This is the delegate I am using

-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    sharedRequest = [RequestHandler sharedRquest];

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 30000, 30000);
    [self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];

    [mapView setCenterCoordinate:mapView.userLocation.location.coordinate animated:YES];
}

but this code is not adding annotations.

P.S I am new to MapKit

Any help would be appreciable.

Thanks