CLGeocoder returns (null) in a NSString but not in NSLog

Question

I have a problem with CLGeocoder, if I try to gain the address name using CLGeocoder and the user current coordinates it correctly returns the address name, postal code, state, etc. in the NSLog but if I try to send those informations in a NSString [contained in a NSMutableArray, but I don't think this is the problem] it returns a (null) value. I suspect this problem is caused by the block I have used in the code, but I am not sure, and I don't know how to fix this problem anyway.

Here's my code:

- (NSArray *)dataArrayPosizione
{
    if (self.arrayPosizione == nil)
    {

        reverseGeocoder = [[CLGeocoder alloc] init];

        locationToReverseGeocode = [[CLLocation alloc]initWithLatitude:self.mapView.userLocation.location.coordinate.latitude longitude:self.mapView.userLocation.location.coordinate.longitude];

        [reverseGeocoder reverseGeocodeLocation:locationToReverseGeocode completionHandler:^(NSArray *placemarks, NSError *error)
        {
            if (placemarks && placemarks.count > 0)
            {
                placemark = placemarks[0];

                NSLog(@"\n%@ %@\n%@, %@, %@\n%@", [placemark subThoroughfare],[placemark thoroughfare], [placemark locality], [placemark administrativeArea], [placemark postalCode], [placemark country]);
            }
        }];

        informazioniPosizione = [NSMutableArray new];

        [informazioniPosizione addObject:[NSString stringWithFormat:@"Indirizzo: %@", [placemark country]]];
        [informazioniPosizione addObject:[NSString stringWithFormat:@"Latitudine: %g\u00B0\nLongitudine: %g\u00B0", self.mapView.userLocation.location.coordinate.latitude, self.mapView.userLocation.location.coordinate.longitude]];

        self.arrayPosizione = informazioniPosizione;
    }

    return self.arrayPosizione;
}

And a picture:

Can someone please help me with this? If the posted code is not enough for you to understand the problem I will paste more lines.

Thanks

Answer 1

You are creating your string before the geocoding block executes. It should look like this:

- (NSArray *)dataArrayPosizione
{
    if (self.arrayPosizione == nil)
    {

        reverseGeocoder = [[CLGeocoder alloc] init];

        locationToReverseGeocode = [[CLLocation alloc]initWithLatitude:self.mapView.userLocation.location.coordinate.latitude longitude:self.mapView.userLocation.location.coordinate.longitude];

        [reverseGeocoder reverseGeocodeLocation:locationToReverseGeocode completionHandler:^(NSArray *placemarks, NSError *error)
        {
            informazioniPosizione = [NSMutableArray new];

            if (placemarks && placemarks.count > 0)
            {
                placemark = placemarks[0];

                NSLog(@"\n%@ %@\n%@, %@, %@\n%@", [placemark subThoroughfare],[placemark thoroughfare], [placemark locality], [placemark administrativeArea], [placemark postalCode], [placemark country]);

                [informazioniPosizione addObject:[NSString stringWithFormat:@"Indirizzo: %@", [placemark country]]];
                [informazioniPosizione addObject:[NSString stringWithFormat:@"Latitudine: %g\u00B0\nLongitudine: %g\u00B0", self.mapView.userLocation.location.coordinate.latitude, self.mapView.userLocation.location.coordinate.longitude]];

            }

            self.arrayPosizione = informazioniPosizione;

            return self.arrayPosizione;
        }];

    }

}