Manage multiple styles of main window in cocoa

Question

What's the best way to switch between multiple styles of main windows in cocoa? I mean something like iTunes with its mini-player view and its normal sized view. I want to layout different nib-files and let the user choose between the small one or the bigger one with more details.
Do I need a NSWindowController or is it ok to load nibs in the App Delegate like this:
[NSBundle loadNibNamed:@"BigWindow" owner:self];

Answer 1

You should always use NSWindowController to load a nib containing a window. This is because NSWindowController handles the nib memory management for you, which is otherwise somewhat painful.

If you just want to load a view from a nib use NSViewController instead.