uiviewcontroller - Where to place drawRect? -

I'm just starting to learn the drawing process for the iPhone, but something confuses me if I have a new view-based Start the application, and set up a new view class, then with the application that came with the scene, after that draw, put it in that new visual category, starts to work

but why I just saw your drawing routine in the scene configuration directly Can not install because I have tried it, and drawRect just do not get when I use setNeedsDisplay.

Thanks in advance for any help.

John Donor