encapsulating the user code_6.swift

class ImagePickerDelegate: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate
{
    let promise = Promise<UIImage>()
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        if let image = (info[UIImagePickerControllerEditedImage] as? UIImage) ?? (info[UIImagePickerControllerOriginalImage] as? UIImage) {
            promise.fulfill(image)
        }
        else {
            promise.reject(UIImagePickerControllerError.missingImage)
        }
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        promise.reject(UserInteractionError.userCanceled)
    }
}

enum UIImagePickerControllerError: Error {
    case missingImage
}