iOS stopped asking user for Photo Library Permission

Question

iOS is not asking user for Photo Library Permission anymore. Even when I deleted the app from the device. This also happens on Simulator.

switch ([ALAssetsLibrary authorizationStatus])
{
    case ALAuthorizationStatusAuthorized:
        RPMLog(@"authorized");
        break;
    case ALAuthorizationStatusDenied:
        RPMLog(@"denied");
        break;
    case ALAuthorizationStatusNotDetermined:
        RPMLog(@"not determined");
        break;
    case ALAuthorizationStatusRestricted:
        RPMLog(@"restricted");
        break;
}

I'm already authorized when I install the app for the first time. Prior to this, there's no other event or screen that asks for the photos to trigger the user prompt.

Then I request the numberOfAssets in SavedPhotos and get it without the access prompt:

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {

    if (!group) return;

    UIActionSheet *actionSheet = nil;
    if (([group numberOfAssets] > 0))
    {
        actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel", nil) destructiveButtonTitle:nil otherButtonTitles:NSLocalizedString(@"Take new photo", nil), NSLocalizedString(@"Use last photo taken", nil), NSLocalizedString(@"Choose existing", nil), nil];
    }
    else
    {
        actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel", nil) destructiveButtonTitle:nil otherButtonTitles:NSLocalizedString(@"Take new photo", nil), NSLocalizedString(@"Choose existing", nil), nil];
    }

    actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
    [actionSheet showFromTabBar:self.tabBar];
    [TestFlight passCheckpoint:@"New Look: Tab Bar"];

} failureBlock:^(NSError *error) {

    NSAssert(!error, [error description]);
}];

Answer 1

As the question is for Photo Library permissions, there is other way without changing the system clock and turning the device off.

You can just go to "Settings" app

(General > Reset > Reset Location & Privacy).

This will make the apps ask for photo library, location and other permissions again.