在构建触摸键盘时，如何在ipad上支持可连接的键盘？

Question

I'm currently developing a touch keypad for iPhone/iPad ( like the one you use to unlock your device ). But I'm having trouble finding documentation on how I can support a 3rd party attachable keyboard for iPad, and make sure it's inputs translate to the touch pad.

Does anyone know what delegates / classes / documentation I can look at to do this?

Thanks, cpb427

(what I'm talking about ) iphone unlock screen http://cdn.nirmaltv.com/images/iPhone-6-lockscreen_1.png

Answer 1

Turns out I didn't dig deep enough before asking this. Apple has a framework for supporting 3rd party devices it's referenced here:

https://developer.apple.com/library/prerelease/ios/documentation/ExternalAccessory/Reference/ExternalAccessoryFrameworkReference/index.html