iPhone SDK UI element preview

Looking for some catalog/gallery(not UICatalog, just images), where I can see preview of each UI element in iPhone SDK, along with corresponding class name(eg datetime picker, calendar, the black switch bar on bottom). This will give me rough idea on which UI elements I can use 开发者_如何学运维in my app and go read about corresponding class.

I would highly recommend reading the iPhone Human Interface Guidelines Document. It's produced by Apple, and has a ton of great advice on how to craft interfaces as well as descriptions and guides for the standard UI elements.

You can also check out the UIKit Framework Reference, and the wiki at CocoaDev. If you need images, teehan+lax have a great PSD template for mockups