I want to know how to make custom UI objects in iPhone ?
You can't do custom objects for iPhone development yet. That's for Mac development.
The closest you can get is to program your own custom component based on a UIView, then place a UIView in IB and change the type to your custom component. It will then let you do any wiring needed and at runtime will embed an instance of your own class. You cannot see the component in IB though, only an empty UIView....
来源：https://stackoverflow.com/questions/6567673/how-to-make-customui-objects-in-xcode-4-for-iphone