How to determine what goes in the xib list

How do you know when you need to add a View Controller or a Nav Item, or other classes in the same window that has File Owner and First Responder icons in it.
I mean I understand I have a View showing and I link it to the File Owner, because the File Owner is the ViewController for that xib. But in what scenarios do you have to add another ViewController, or a TableViewController, of a NavController, or a NavItem or NavBar.
And I do not mean the MainWindow.xib which has a Window, I mean other new xib files that you create to make the rest of your application.
Thanks for the help
Mark

A general rule of thumb is that you will have a nib for each ViewController. Sometimes a VC is so simple that there is no need to lay it out interactively - these may be implemented entirely in code. In contrast a view may become so complex that you choose to implement some of its subviews in separate nibs.

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How to determine what goes in the xib list

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