Why are location services not being used after I allow them? - ios

Question

In my iOS application, I have a table that uses your location to find data that is near you. I just installed it on my iPhone today, and when location services were needed, I got the expected alert that said "MyAppName would like to use your current location" and once I pressed OK, the app basically froze. When I closed the app and reopened it however, it worked perfectly fine. Now that I think about it, this happened on the simulator as well, as I have to run the app a couple times before location services works properly there too. Has this happened to anyone else, and do you know how to fix this? I don't want my users to have to close the app and reopen it for location services to work properly.
Here is some relevant code:
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"%#",error.userInfo);
if([CLLocationManager locationServicesEnabled]){
NSLog(#"Location Services Enabled");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Need Your Location"
message:#"Please go to Settings and turn on Location Services so you can see who's near you."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
_thisGeoPoint = [PFGeoPoint geoPointWithLatitude:currentLocation.coordinate.latitude
longitude:currentLocation.coordinate.longitude];
}
[locationManager stopUpdatingLocation];
located = true;
}

Answer 1

This is happening because locationManager stops running when it doesn't initially have permission. So you will need to re-run it once you detect that the permission has changed. You can check if the permission changed using the didChangeAuthorizationStatus delegate method.
So something like this:
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
if (status == kCLAuthorizationStatusAuthorized) {
[locationManager startUpdatingLocation];
}
}