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Re: NSKeyValueBindingCreation Protocol
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Re: NSKeyValueBindingCreation Protocol


  • Subject: Re: NSKeyValueBindingCreation Protocol
  • From: Kyle Sluder <email@hidden>
  • Date: Sat, 28 Apr 2012 18:07:41 -0700

On Apr 28, 2012, at 10:17 AM, Richard Somers <email@hidden> 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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