On Apr 28, 2012, at 10:17 AM, Richard Somers <rsomers...@awinets.com> wrote:

> I have a number of controls with custom bindings that are programmatically 
> added to a view hierarchy in a window. Calling –unbind: on these controls 
> when the window is closes is a challenge.

Why? Someone has to have called -bind::: on them. Make that thing call -unbind: 
when your window delegate (most likely your NSWindowController subclass) gets 
-windowWillClose:.

> 
> But it actually does not seem to matter. If –unbind: is never called and the 
> window is closed there are no memory leaks reported in Instruments.

You're probably leaking observers and might crash at some point. You said 
"custom bindings"; how are your bindings implemented?

> 
> Apple has an undocumented class NSAutounbinder which apparently addresses a 
> problem with retain cycles when binding to File's Owner from a nib file. 
> However I am binding programmatically not inside a nib file. But perhaps 
> NSAutounbinder is somehow working in my behalf.

Doubtful. I believe NSAutounbinder is only used by the nib loading machinery.

> 
> Is unbinding my programmatic bindings when the window closes something that I 
> should worry about? 

Yes.

--Kyle Sluder
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