Has anyone created a specialised mobile keyboard?

[Graham Samuel]

In the iOS app I’m developing, it would be nice (I mean less confusing for the user) to display a keyboard with only certain keys - numerals and certain other letters and symbols, on the lines of the various native keyboards available (numeric, email etc). I see that I can create one from scratch using graphics and buttons, but I wondered if there is a more native-style trick to this. I know so little about iOS APIs - I thought perhaps someone with more knowledge might have tried it.

Graham