I see that Chilkat has rar support for .Net (http://www.chilkatsoft.com/rar-dotnet.asp). Is there any chance of a similar component for iOS?
The existing Chilkat unRAR functionality will be maintained where it already exists, but I'm sorry to say that Chilkat will not be including it in new architectures, platforms, etc. Nor will Chilkat be extending the features relating to RAR. The reason is because of RAR licensing (see http://en.wikipedia.org/wiki/RAR )
1) The RAR format is not publicly documented.
2) RAR files may be created only with commercial software WinRAR, RAR, and software that has permission from the licensor Alexander Roshal (Eugene's brother). Third-party programs that can only read (unpack) RAR files.