Objective C - How to detect user has clicked Don't Allow access to photos button

Question

I am using a UIImagePicker to present the users photos so that the user can choose an image to be used in my app.

My problem is that on the first time a user opens t

Answer 1

I had a similar problem. You can look at my code below if it can help anyone in future who may have similar problem.I have an IBAction which helps me load the images. I struggled with this method for 4-5 hours.

(IBAction)loadImages:(id)sender {
    ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];

    if (status == AVAuthorizationStatusAuthorized || status == AVAuthorizationStatusNotDetermined) {

        ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc]init];
        [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
            if (*stop) {
                self.imagePicker = [[UIImagePickerController alloc] init];
                self.imagePicker.delegate = self;
                self.imagePicker.allowsEditing = NO;
                self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                imagePicker.mediaTypes =[UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
                [self presentViewController:imagePicker animated:YES completion:^{
                    //TODO
                }];
                return;
            }
            *stop = TRUE;
        } failureBlock:^(NSError *error) {
            [imagePicker dismissViewControllerAnimated:YES completion:nil];
        }];
    }

    if (status == AVAuthorizationStatusDenied || status == AVAuthorizationStatusRestricted) {
        UIAlertView *cameraAlert = [[UIAlertView alloc]initWithTitle:NSLocalizedString(@"Camera Access Required", nil) message:NSLocalizedString(@"Please allow us to access your camera roll in your device Settings.", nil) delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil, nil];
        [cameraAlert show];
    }
}

Answer 2

Got it!

if ([ALAssetsLibrary authorizationStatus] == ALAuthorizationStatusNotDetermined) {
    ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
    [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
        if (*stop) {
            // INSERT CODE TO PERFORM WHEN USER TAPS OK eg. :
            return;
        }
        *stop = TRUE;
    } failureBlock:^(NSError *error) {
        // INSERT CODE TO PERFORM WHEN USER TAPS DONT ALLOW, eg. :
        self.imagePickerController dismissViewControllerAnimated:YES completion:nil];
    }];
}

Answer 3

Use ALAssetsLibrary authorizationStatus. There is a specific return value that indicates your app has been denied.

Doing a search here on that method will reveal some sample code for properly handling the various authorization states.