Obtain latitude and longitude

Question

I would like to know how to get latitude and longitude in iOS using Objective-C. Could someone help me? I’ve followed several examples but none displays the correct information.

Answer 1

From the iOS 8 you need a few steps beyond what we were used to before the system upgrade, maybe this was missing in the tutorials you found on the web because I came across this same situation.

In your file Info.plist, there are two properties you can add (use text mode):

To get location while the app is running (even on background):

<key>NSLocationAlwaysUsageDescription</key>
<string>Mensagem para o usuário</string>

To get location while the app is focused only:

<key>NSLocationWhenInUseUsageDescription</key>
<string>Mensagem para o usuário</string>

After importing the framework Corelocation to your project, add the following delegate in your file .h:

@interface LocalizacaoViewController: UIViewController <CLLocationManagerDelegate>

And then start searching your implementation file:

if (self.locManager == nil) {
    self.locManager = [[CLLocationManager alloc] init];

    [self.locManager setDelegate:self];
    [self.locManager setDesiredAccuracy:kCLLocationAccuracyBestForNavigation];
}

// Verificação de recurso apenas para iOS 8
if ([self.locManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
    [self.locManager requestWhenInUseAuthorization]; // Ou requestAlwaysAuthorization
}

[self.locManager startUpdatingLocation];

And finally, the implementation of delegate:

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

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    CLLocation *lastLocation = [locations lastObject];

    // Latitude: lastLocation.coordinate.latitude
    // Longitude: lastLocation.coordinate.longitude
}

In these methods, unless you say to end the location update with [self.locManager stopUpdatingLocation], they will be executed every time there is change.

See if you can succeed with implementation this way.