Getting Longitude and Latitude Values - iphone

Question

I am trying to connect to GPS from my code. I am doing so according to this tutorial.
- (void)viewDidLoad {
[super viewDidLoad];
CLController = [[CoreLocationController alloc] init];
CLController.delegate = self;
[CLController.locMgr startUpdatingLocation];
}
- (void)locationUpdate:(CLLocation *)location {
locLabel.text = [location description];
}
- (void)locationError:(NSError *)error {
locLabel.text = [error description];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
The above code is placed in a view controller called GetMyLocationViewController, and I have another view controller called MainScreenViewController.
When the screen loads, the MainScreenViewController gets loaded, and I will need the GPS location to continue operations with this screen.
In the ViewDidLoad method of MainScreenViewController I wrote the following;
- (void)viewDidLoad {
[super viewDidLoad];
GetMyLocationViewController *getMyLocationViewController = [[GetMyLocationViewController alloc]initwithXib:nil bundle:nil];
[self.navigationController pushViewController:getMyLocationViewController Animation:YES];
// AND THEN I NEED TO ACCESS THE LONGITUDE AND LATITUDE VALUES
}
When the above code gets executed, the viewDidLoad method of MainScreenViewController gets executed, but not the locationUpdate method. The only way I could get the values of longitude and latitude is by the execution of locationUpdate method. So how can I get these values?

Answer 1

Do you tested in a device? xcode before the version 4.2 dont have a GPS simulator, because of that the method locationUpdate never call.
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
if([self.delegate conformsToProtocol:#protocol(CoreLocationControllerDelegate)]) { // Check if the class assigning itself as the delegate conforms to our protocol. If not, the message will go nowhere. Not good.
[self.delegate locationUpdate:newLocation];
}
}

Answer 2

Are you sure you are loading your GetMyLocationViewController? Your code only shows loading the MainScreenViewController, which, in its -viewDidLoad method, loads itself again, which would cause an infinite loop of loading and pushing MainScreenViewControllers.
UPDATE: That CoreLocationController class in the tutorial seems unnecessary. Rather that using it, make CLLocationManager a property of your GetMyLocationViewController. Make GetMyLocationViewController's -viewDidLoad method look like this:
-(void)viewDidLoad {
[super viewDidLoad];
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self.locationManager startUpdatingLocation];
}
don't forget to import the CoreLocation library and implement the delegate methods.