I’ve put some work into building the basics of a framework that can be used for any isometric game. Here’s a video of what the current prototype can do:
Basically, it handles input for scrolling, pinching/zooming as well as accelerometer data to rotate the whole interface depending on how you hold the iPhone.
The buttons are a single GUITexture so that it only uses one draw call. Throughout the video, the iPhone uses 2-3 draw calls (the glow overlay is the 3rd call). That puts it low enough that there’s still enough room for the game itself.
Since we were just talking about “starter kits” in this thread, I wanted to post my current status on this and invite any feedback. Especially on what you’d like to see in such a framework if you would consider buying it.