iOS Question Any library to compress strings on iOS?

Any library to compress strings on iOS?.. like that...

https://www.b4x.com/android/forum/threads/b4x-way-to-compress-uncompress-a-string.104726/post-656548

I'm trying to compress a data string as much as possible, so that it takes up less data when posting to a server.
On this site, it seems that the method that reduces the most is "deflate", ... any suggestions?, .. I would like a B4x solution since I use it for iOS and Android.

http://www.txtwizard.net/compression

Thanks a lot.