Picker Error Message on Exit (encountered while discovering extensions: Error Domain=PlugInKit Code=13) With Swift 4 - Xcode 9

Question

Similar to

PhotoPicker discovery error: Error Domain=PlugInKit Code=13

and also to

https://forums.developer.apple.com/thread/82105

BUT I have t

Answer 1

It is because your app uses photo library (in this case, using UIImagePickerController) without asking for user permission. As an example, if I want to show the image picker when the add button was tapped:

@IBAction func addButtonTapped(_ sender: UIBarButtonItem) {
    checkPermission {
        let picker = UIImagePickerController()
        picker.sourceType = .photoLibrary
        picker.mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary)!

        picker.delegate = self
        picker.allowsEditing = false
        self.present(picker, animated: true, completion: nil)
    }
}

func checkPermission(hanler: @escaping () -> Void) {
    let photoAuthorizationStatus = PHPhotoLibrary.authorizationStatus()
    switch photoAuthorizationStatus {
    case .authorized:
        // Access is already granted by user
        hanler()
    case .notDetermined:
        PHPhotoLibrary.requestAuthorization { (newStatus) in
            if newStatus == PHAuthorizationStatus.authorized {
                // Access is granted by user
                hanler()
            }
        }
    default:
        print("Error: no access to photo album.")
    }
}

In addition, need to add this to your plist as well:

NSPhotoLibraryUsageDescription
So that you can add images for your cloth. 

which is the message displayed in the permission dialog.