How can I implement text recognition on an iOS app?

Question

I'm new to iOS development and I'm trying to make an app that, using the iPhone's camera, recognizes a string of numbers and converts them to text.

Is there a module for iOS development that I can easily incorporate into my app? Or is there a generic module that I can possibly try to port iOS?

Of course, a free module is better.

Thanks in advance :)

Edit: To remove the hold moderators have put on this question, I've put the following requirements:

1. The module will take an image or an area of an image as input and recognize the text on it.
2. The module must be compatible with one of the iOS development languages.
3. The module must be able to work without an internet connection (a local engine as opposed to one that sends requests to a server)