Is there a way to generate QR code image on iOS

Question

Is there a standard way to generate a QR code and attach it to a mail item from iOS client app (no server code)?

Answer 1

...which will let me generate links...

First, you need to find a short link service, e.g. bit.ly or goo.by, to make a long link shorter and thus reduce QR Code size.

To perform this task automatically you will have to use some web service.

...then generate a QR code...

ZXing is a popular open source QR Code generator also available for iOS