I want to generate the colorful QR code. I had used https://github.com/kuapay/iOS-QR-Code-Generator code to generate the QR code. now the qr code generated is always n blac
You'll have to tinker with the Z-Bar code to do that.
Maybe these links might help:
http://mashable.com/2011/04/18/qr-code-design-tips/
http://qreateandtrack.com/2011/01/06/adding-a-bit-of-color-to-your-qr-codes/
and
http://keremerkan.net/qr-code-and-2d-code-generator/