// `type` in this method can be face, barcode or text
image.detector.crop(type: .face) { [weak self] result in
    switch result {
        case .success(let croppedImages):
            // When the `Vision` successfully find type of object you set and successfuly crops it.
            print("Found")
        case .notFound:
            // When the image doesn't contain any type of object you did set, `result` will be `.notFound`.
            print("Not Found")
        case .failure(let error):
            // When the any error occured, `result` will be `failure`.
            print(error.localizedDescription)
        }
}