didUpdateLocation not called first time run - ios

Question

location services within my app are not working the first time you run it. The second time, and any time after that though, it works fine. Here's my code:
- (void)viewDidLoad {
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.allowsBackgroundLocationUpdates = true;
[locationManager requestAlwaysAuthorization];
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedAlways ||
[CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedWhenInUse) {
[locationManager startUpdatingLocation];
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
latitude = locationManager.location.coordinate.latitude;
longitude = locationManager.location.coordinate.longitude;
NSLog(#"New Location. Lat: %f, Long: %f", latitude, longitude);
}

Answer 1

The issue is that requestAlwaysAuthorization runs asynchronously, so your code which checks authorization and calls startUpdatingLocation will execute before authorization has been given by the user. That's why it'll work the second time, because they gave the permission the first time. What you can do is implement locationManager:didChangeAuthorizationStatus: on the delegate and call startUpdatingLocation in there too (if status changed to authorized).
From Apple docs
When the current authorization status is
kCLAuthorizationStatusNotDetermined, this method runs asynchronously
and prompts the user to grant permission to the app to use location
services