Re: How to tell if NSArrayController has a selected CoreData instance?
Re: How to tell if NSArrayController has a selected CoreData instance?
- Subject: Re: How to tell if NSArrayController has a selected CoreData instance?
- From: "Timothy Reaves" <email@hidden>
- Date: Wed, 30 Sep 2009 08:31:11 -0400 (EDT)
- Importance: Normal
> On Sep 29, 2009, at 7:10 AM, "Timothy Reaves"
> <email@hidden
> > wrote:
>
>> What makes you think you can? Logically, you shouldn't be
>> able. I'd
>> imagine selectedObjects is always going to return an index set; it'd
>> just be empty with no selection. I did try comparing it to
>> NSNoSelectionMarker just in case, and that doesn't work.
>
>
> Perhaps instead of imagining it would be more helpful to read the
> documentation. -[NSObjectController selectedObjects] returns the
> actual objects.
>
> You also don't seem to understand how bindings work. Even if -
> selectedObjects did return an NSIndexPath, it's a KVO-compliant
> property and therefore perfectly suitable for binding to.
>
> --Kyle Sluder
I mixed up selectedIndexes. So, yes, it does return objects.
However, it does not in fact return the actual objects. It returns
proxies. Which is what I said in my original post. So even if there
are no selected objects, you get back a non-empty array.
You've read some documentation I haven't; contrary to your
statement, I do understand KVO. What I don't understand is what key
I would bind to to determine if that core data proxy is a proxy of a
real object, or not? Which is the actual subject of the post. How
to determine if the selected object returned from selection,
selectedObjects, etc., is a proxy or not.
Kyle, I appreciate your expertise.
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