Re: Why aren't my bindings firing?
Re: Why aren't my bindings firing?
- Subject: Re: Why aren't my bindings firing?
- From: "Michael Ash" <email@hidden>
- Date: Mon, 30 Jun 2008 19:56:30 -0400
On Mon, Jun 30, 2008 at 5:04 PM, Hamish Allan <email@hidden> wrote:
> On Mon, Jun 30, 2008 at 3:56 PM, Michael Ash <email@hidden> wrote:
>
>> Although Apple's sample code shows overriding -bind:... to store
>> information about the new binding, it doesn't look like this is
>> necessary. You can simply use -infoForBinding: to obtain the info
>> dictionary, extract the bound object and key, and use that information
>> to update the model object. I'd assume this is what the Apple classes
>> do, and it seems to me to be a lot simpler than overriding -bind:...
>> to stash away a bunch of information that's already being stored for
>> you anyway.
>
> That would seem a pretty reasonable assumption, but it doesn't seem to
> be the case. At least, breakpoints on -[NSTextField infoForBinding:],
> -[NSControl infoForBinding:], -[NSObject infoForBinding:] don't seem
> to trigger when the text field is edited; nor are messages logged from
> a subclass of NSTextField overriding -infoForBinding:.
>
> Any other ideas, anyone?
Well, this is irrelevant to the question of what *you* should do.
Using -infoForBinding: is simple and it works, so use it.
However, if you're curious about what Apple does, it shouldn't be too
hard to find out. You know one thing that happens reliably: your
model's key is set. So set up a test app, put a breakpoint on the
model's setter, then see what's calling it. The rest should follow
from there.
Mike
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