How too save image to Photo library in iOS

import UIKit

struct ImageService {
    final class Delegate: NSObject {
        let completion: (Error?) -> Void

        init(completion: @escaping (Error?) -> Void) {
            self.completion = completion
        }

        @objc func savedImage(
            _ im: UIImage,
            error: Error?,
            context: UnsafeMutableRawPointer?
        ) {
            DispatchQueue.main.async {
                self.completion(error)
            }
        }
    }

    func addToPhotos(image: UIImage, completion: @escaping (Error?) -> Void) {
        let delegate = Delegate(completion: completion)
        UIImageWriteToSavedPhotosAlbum(
            image,
            delegate,
            #selector(Delegate.savedImage(_:error:context:)),
            nil
        )
    }
}