You know, I'm going to change my answer -- just try it. Register for the free SDK, download it, and see if it can be figured out. It is a really good interface.
And watch the video, where, during one of the meetings (WWDC? Town Hall?) they actually brought someone up on stage, and he developed something there, on the fly, in real time. I'll post a link, later. There's also some tutorial videos.
But start by registering and downloading the SDK. I believe you have access to the iPhone emulator.