Add iCade controller support to your Unity iOS project.
In your Xcode project, add the files that begin with iCade to the Classes folder. Open AppController.mm from this repo, and copy/paste the lines of code to the correct places in the Unity generated AppController.mm of your project.
In MonoDevelop, simply use Input.GetKeyDown(KeyCode.JoystickButton#)), Input.GetKeyUp(KeyCode.JoystickButton#)) or Input.GetKey(KeyCode.JoystickButton#)). The corresponding button numbers are shown in iCade8-bitty.png.
iCadeReaderView.h, iCadeReaderView.m and iCadeState.h slightly modified (retains/releases delegate) from https://github.com/scarnie/iCade-iOS