QR code reader for iPhone

Question

I want to create QR code reader based application.

Using which library, I can create my application ?

Note: I searched in google. Always I am getting

Answer 1

ZBarSDK is another option. A very capable library.

UPDATE January 2014

Beginning in iOS7, AVCaptureDevice now includes the ability to read barcodes (of all kinds) and return a human readable value. If you're targeting iOS7+, this is the way to go. ZBarSDK is still great for pre-iOS7 support, of course.