How to simulate a sign language keyboard in IOS?

问题

I'm trying to develop an app similar to this one :

I was able to use custom font, but what if the letter are images and not a font file? Any how can I send it as an email for exemple?

Thanks a lot.

来源：https://stackoverflow.com/questions/17046469/how-to-simulate-a-sign-language-keyboard-in-ios