Overlay library for iOS?

there's an open-source library generating nice overlays for iPhone/iPad, but I don't find it any more... Does anyone know which one I mean?

EDIT: I'm开发者_如何学JAVA looking for a gray, semi-transparent overlay view e.g. in the middle of the screen. I'd like to show information there while scrolling happens. As soon as scrolling ends, the overlay would disappear.

Maybe you are talking about MBProgressHUD?

https://github.com/jdg/MBProgressHUD

I use ATMHud. It looks like this.