On May 27, 2013, at 20:34 , YT <y...@redwoodcontent.com> wrote:

> Here is an extracted section

I found the section of documentation you're referring to (it wasn't easy, you 
didn't give us much to go on).

The short answer to your concern is that this piece of documentation is just 
plain wrong. If you need to add a view-specific controller, it should be a 
NSViewController, or a subclass, and not a subclass of NSController. 
NSController subclasses serve a different purpose -- they are "mediating" 
controllers, which is a respectable name for class-wrapped glue code. 

If you're coming from iOS, the nearest equivalent to UIViewController is 
NSWindowController -- *not* NSViewController, and certainly not NSController.

When starting a new Mac app, the Cocoa classes you need to pay immediate 
attention to are:

-- the app delegate (a custom class you define)

-- if it's a document-based app, a NSDocument subclass

-- for each window in your app a NSWindowController subclass

In the broadest MVC terms, the "C" is often a NSWindowController subclass. The 
"M" is often the app delegate *or* a NSDocument subclass, or is a more 
specialized object graph to which the app delegate or document holds a 
reference. The "V" is the window and its contained views.

However, it's a bit difficult to advise you more specifically on this without 
knowing whether your app is document-based or non-document-based.

Stay away from NSViewController until and unless you find that you need it, and 
know why you need it. It isn't UIViewController. Rather, it's a sort of 
specialized NSWindowController, but for independently-loaded views instead of 
windows.



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