iOS 13 仅在用户“允许一次”后再次调用 requestAlwaysAuthorization

Question

During requesting for Always permission on iOS13, the user can tap "Allow Once" which will call appropriate delegate with status kCLAuthorizationStatusAuthorizedWhenInUse but requesting for "Always" again calls delegate with kCLAuthorizationStatusAuthorizedAlways . Why? When other combinations work only once like you request always, you get it and even calling again will not call delegate with status.

Sample code to test:

@import CoreLocation;

@interface ViewController () <CLLocationManagerDelegate>

@property (strong, nonatomic) CLLocationManager *locationManager;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
}
- (IBAction)doauthloc:(id)sender {
    [self.locationManager requestAlwaysAuthorization];
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
    switch(status) {
        case kCLAuthorizationStatusNotDetermined:NSLog(@"AUTH STATUS:kCLAuthorizationStatusNotDetermined"); break;
        case kCLAuthorizationStatusRestricted:NSLog(@"AUTH STATUS:kCLAuthorizationStatusRestricted"); break;
        case kCLAuthorizationStatusDenied:NSLog(@"AUTH STATUS:kCLAuthorizationStatusDenied"); break;
        case kCLAuthorizationStatusAuthorizedAlways:NSLog(@"AUTH STATUS:kCLAuthorizationStatusAuthorizedAlways"); break;
        case kCLAuthorizationStatusAuthorizedWhenInUse:NSLog(@"AUTH STATUS:kCLAuthorizationStatusAuthorizedWhenInUse"); break;
    };
}

@end

Answer 1

It's a little confusing, isn't it? When you ask for Always and the user taps Allow Once, you are told that you got WhenInUse. But that doesn't actually matter. You have provisional Always. So:

• When you subsequently go into the background and start monitoring visits or regions or whatever your location monitoring usage is, this will be converted into Always authorization for purposes of usage. (Your logging should confirm this.)

• And then, because you got only Once authorization, when you come back to the foreground you will be Not Determined again.

So the takeaway is, just laugh an evil laugh and move on. Your background location monitoring will work, and that's all that matters. Not only does it work, but as a bonus you get to present the user with the authorization alert again , which is the reason for all this change in iOS 13. Don't worry, be happy.