How to create a screen that let user to draw a 'sketch' through finger touch?

I am developing an app which will let users to 'draw' on screen via finger touch - so basically users can write, draw shapes - similar to a white board.

The problem is I am a newbie as far as iphone graphics programming is concerned, I would highly appreciate if community here provide some sample code link or suggest a direction as what I should study for this. Thanks.


Here's a tutorial that I found in the first page of google search results, this should get you started:

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