async UIImageWriteToSavedPhotosAlbum(_:_:_:_:)

gistfile1.swift

private final class UIImageWriteToSavedPhotosAlbumCompletion: NSObject {
  var continuation: CheckedContinuation<Void, any Error>?

  @objc func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
    if let error {
      continuation?.resume(throwing: error)
    } else {
      continuation?.resume()
    }
    continuation = nil
  }
}

func UIImageWriteToSavedPhotosAlbum(_ image: UIImage) async throws {
  let completion = UIImageWriteToSavedPhotosAlbumCompletion()
  return try await withCheckedThrowingContinuation { continuation in
    completion.continuation = continuation

    UIImageWriteToSavedPhotosAlbum(
      image,
      completion,
      #selector(UIImageWriteToSavedPhotosAlbumCompletion.image(_:didFinishSavingWithError:contextInfo:)),
      nil
    )
  }
}