Getting Longitude/Latitude of the User When the viewDidLoad

Question

My purpose is to get the longitude/latitude of the user when the view is loaded and to store the values in two variables for later calculations. I don't need to track the user location and to update it, I simply need to get his/her coordinates once. My code looks like this:

- (void)viewDidLoad {
    [super viewDidLoad];
    // locationManager update as location
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    [locationManager startUpdatingLocation];
    CLLocation *location = [locationManager location];
    // Configure the new event with information from the location
    CLLocationCoordinate2D coordinate = [location coordinate];

    float longitude=coordinate.longitude;
    float latitude=coordinate.latitude;

    NSLog(@"dLongitude : %f",longitude);
    NSLog(@"dLatitude : %f", latitude); 
}

In the console i keep getting this:

dLongitude : 0.000000
dLatitude : 0.000000

Can you please help me there?

Answer 1

To get user's location even once you need to make locationManager to start updating locations (you did that) and implement delegate method that manager calls when location is retrieved - you can't get location from location manager immediately.

If you don't want to track user location - just stop updating locations in that delegate method after location was fetched for the 1st time (and store it if you need it in future).

Answer 2

As soon as you call [locationManager startUpdatingLocation]; your viewDidLoad method is done. You need to implement

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

and

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

which will be called by your locationManager when it gets the location, or when it fails. In both of those methods, you can call [locationManager stopUpdatingLocation].

Inside the didUpdateToLocation method, you should move all your code from viewDidLoad, starting with CLLocation *location = [locationManager location]; That's where you'll get proper values.

Answer 3

This worked for me

- (void)viewDidLoad {
    [super viewDidLoad];
    // locationManager update as location
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    [locationManager startUpdatingLocation];
    [locationManager stopUpdatingLocation];
    CLLocation *location = [locationManager location];
    // Configure the new event with information from the location

    float longitude=location.coordinate.longitude;
    float latitude=location.coordinate.latitude;

    NSLog(@"dLongitude : %f", longitude);
    NSLog(@"dLatitude : %f", latitude); 
}