iTunes U for the iPhone has these wonderful buttons that show
- the download progress
- the stop button and the
- play button (well, the “i” button)
in one place – see attached screenshot. Is this a system icon which can be called by code, or is it something thats not available for developers?
Anyhow: if someone has a source, that describes how to get such kind of buttons, I’d be very happy. It’s clear to me, that the icons are controlled by a state-pattern in view-controller.
Thanks in advance.

There is DACircularProgress on github, it looks just like the circular progress bar on the Facebook app, I think you can take that, modify it to put the stop button on top and change the color and use it. check it out:
DACircularProgress