I've put a fork to ZipArchive on github which addresses the following issues:

1. Support both ARC and non-ARC.

2. Upgrade Minizip from 1.01e to 1.01h.

3. Replace deprecated methods.

4. Made a couple of minor code corrections to remedy unnecessary compiler warnings that were generated when using Xcode 5.

5. Documented code.

6. Minor corrections.

See https://github.com/robertmryan/ZipArchive. I'm happy to integrate these as a commit to this project here if you want. Let me know.