Support English and Chinese language, other language trained data can be downloaded from this link :https://github.com/mobyzhang/tessdata, just add the trained data files to the tessdata folder will be fine.
The introduction to OCR engine can be seen in the code folder.
Tesseract OCR iOS and TesseractOCR.framework are distributed under the MIT license (see LICENSE.md).
Tesseract, maintained by Google (http://code.google.com/p/tesseract-ocr/), is distributed under the Apache 2.0 license (see http://www.apache.org/licenses/LICENSE-2.0).
Daniele Galiotto (founder) - iOS Freelance Developer - www.g8production.com
Kevin Conley - www.kevintechnology.com