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Apple docs at:

This would appear to be the protocol that controls what shows up in InterfaceBuilder’s BindingsInspector. All sub-classes of NSObject inherit this protocol.

An illuminating discussion on Apple’s cocoa-dev mailing list yielded the following insight:

A binding name is not a KVC key at all. It is an identifier associated with an abstract property and a concrete object/KVC key combination. When you change a control’s value, it looks in its binding table for what a “value” corresponds to in programmatic terms of object and KVC key. Binding names play a strictly internal role. When setting up KVO to see changes and using KVC to make changes, controls only use the object and KVC key.

I tried to create an NSView and call this protocol’s exposedBindings method to get a list of bindings that NSView exposes, but I get 0 bindings back. I know it at least has a hidden binding. What gives?

�Ah, interesting. It does show the hidden binding when the NSView is actually part of a window. Earlier, when I tried a “naked” NSView (created in main() of a command-line app without a run loop), the binding didn’t show up. Maybe I did it wrong last time, or maybe the exposed bindings can be contextual. �DustinVoss

When I call “exposedBindings” on an NSImageView object I get the following result: (fontSize, fontName, enabled, fontFamilyName, font, fontItalic, hidden, value, motionVectors, editable, fontBold)

What I don’t understand is:

– Frank Illenberger

As to the “font” bindings, I’d guess that they are part of NSControl (I’m fairly sure value is as well), and IB filters them out somehow (and by “somehow” I mean “they probably hard-coded it”). �DustinVoss