Swift LocationManager didChangeAuthorizationStatus Always Called

Question

I have a view controller which implements the CLLocationManagerDelegate. I create a the CLLocationManager variable:

let locationManager = CLLocationManager() 

Then in the viewDidLoad, I set properties:

// Set location manager properties locationManager.delegate = self locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters locationManager.distanceFilter = 50 

The problem comes that the function gets called even before I check the authorization status.

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {     if (status == .AuthorizedWhenInUse) {         // User has granted autorization to location, get location         locationManager.startUpdatingLocation()     } } 

Can anyone inform me what could be causing this to occur?

Answer 1

- locationManager:didChangeAuthorizationStatus: is called shortly after the CLLocationManager is initialised.

You can request authorization inside the delegate method if you want:

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {     switch status {     case .notDetermined:         locationManager.requestAlwaysAuthorization()         break     case .authorizedWhenInUse:         locationManager.startUpdatingLocation()         break     case .authorizedAlways:         locationManager.startUpdatingLocation()         break     case .restricted:         // restricted by e.g. parental controls. User can't enable Location Services         break     case .denied:         // user denied your app access to Location Services, but can grant access from Settings.app         break     default:         break     } } 

Be aware that you need to assign the delegate in a 'timely' matter if you want this to work.

If you would somehow delay the delegate assignment, e.g. by setting it asynchronously, you might miss the initial call to - locationManager:didChangeAuthorizationStatus:.

Answer 2

Swift 3

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {         switch status {         case .notDetermined:             manager.requestAlwaysAuthorization()             break         case .authorizedWhenInUse:             manager.startUpdatingLocation()             break         case .authorizedAlways:             manager.startUpdatingLocation()             break         case .restricted:             // restricted by e.g. parental controls. User can't enable Location Services             break         case .denied:             // user denied your app access to Location Services, but can grant access from Settings.app             break         }     }