implement tesseract OCR in iphone

Question

i want to implement handwriting recognition in my project

for example when user writes A on the screen, then screen should display A,

Answer 1

Tesseract is currently under Apache License. If you are planning a commercial application, that means you should include a copy of the Apache license, and you display a copy of the required copyright notice wherever your program displays copyright notices.

http://en.wikipedia.org/wiki/Tesseract_(software)

Here is a link to someone who is using the engine in their android app. http://gaut.am/making-an-ocr-android-app-using-tesseract/