Add progress bar

[yorukot]

Make response can receive the current progress.

Just a suggestion I don't think this is definitely a good feature and may cause performance issues. But it would be a good feature to be able to choose whether to restore the current progress.

[davidnewhall]

Can you tell me more about your use case and what sort of implementation you'd like to see?

[yorukot]

I have an Application that is a file manager. When the user decompresses a file (especially a large file), if there is a progress bar showing how many files have been decompressed so far ex: 10/100, this will bring great convenience to the user.

When starting to send messages to CBChannel,add a variable to indicate how many files the compressed file has. Every few files or every period of time, the total number of files decompressed so far is transferred.

If this is possible for this package I might be able to help add this functionality!