Delay in Corelocation

I've created a helper class for my location needs so i don't violate the DRY principle. The class looks like this:
Location.h

@interface Location : NSObject <CLLocationManagerDelegate>{
CLLocationManager *manager;
CLGeocoder *geocoder;
CLPlacemark *placemark;
}

-(float)latitude;
-(float)longitude;
-(NSString *)postalcode;

Location.m

@implementation Location{
    float latitude;
    float longitude;
    NSString *postalcode;
}
-(id)init{
    NSLog(@"Hallo");
    [self setupLocationManager];
    return self;
}

-(float)latitude{

    return latitude;
}

-(float)longitude{

    return longitude;
}

-(NSString *)postalcode{

    return postalcode;
}

-(void)setupLocationManager{
    manager = [[CLLocationManager alloc] init];
    [manager requestWhenInUseAuthorization];
    manager.delegate = self;
    manager.desiredAccuracy = kCLLocationAccuracyBest;
    manager.distanceFilter = 100;
    [manager startUpdatingLocation];
    geocoder = [[CLGeocoder alloc] init];
 }

 #pragma mark - CLLocationManagerDelegate Methods

 - (void)locationManager:(CLLocationManager *)manager didFailWithError:          (NSError *)error
{

     NSLog(@"Error: %@", error);
     NSLog(@"Failed to get location! :(");

}

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

NSLog(@"Location: %@", newLocation);
CLLocation *currentLocation = newLocation;

if (currentLocation != nil) {

    latitude = currentLocation.coordinate.latitude;
    longitude = currentLocation.coordinate.longitude;


}

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

    if (error == nil && [placemarks count] > 0) {

        placemark = [placemarks lastObject];
        postalcode = [NSString stringWithFormat:@"%@",placemark.postalCode];
        /*
         self.address.text = [NSString stringWithFormat:@"%@ %@\n%@ %@\n%@\n%@",
         placemark.subThoroughfare, placemark.thoroughfare,
         placemark.postalCode, placemark.locality,
         placemark.administrativeArea,
         placemark.country];
         */
    } else {

        NSLog(@"%@", error.debugDescription);

    }

} ];

}


 @end

When i in my ViewController tries to create an instance of Location and set latitude and longitude labels, in the viewDidLoad method, the labels are sat to 0.00000. Apparently it takes around half a second for Location to get the coordinates. I've tried using

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
        [self setCoordinateLabels];
    });

But that just seems very hacky and can't possibly be the best practise? So is there any way i could do this a better way?