Customising UITableView

I'm playing with Xcode/Interface Builder and I'm able to build simple Navigation apps. I'm wondering how the guys at TapBots manage to get their table views themed like this:

http://tapbots.com/img/software/convertbot/screenshot_05.jpg (http://tapbots.com/software/convertbot/#gallery)

I've tried setting backgrounds on tables, but I lose the rounded corners. Is thi开发者_JS百科s an easy thing to achieve?

The Tapbots developer spent around 6 months writing a customised UI library, which is what you see there.

It's basically a reimplementation of UIKit with personalised styling.