Re: Missing children in NSTreeController/NSOutlineView
Re: Missing children in NSTreeController/NSOutlineView
- Subject: Re: Missing children in NSTreeController/NSOutlineView
- From: Ken Thomases <email@hidden>
- Date: Mon, 14 May 2012 10:58:45 -0500
On May 14, 2012, at 10:40 AM, Kyle Sluder wrote:
> On May 14, 2012, at 1:06 AM, Quincey Morris <email@hidden> wrote:
>
>> 2. Check the KVO compliance of whichever of these keys you use. For example, a leaf key like this:
>>
>> - (BOOL) isLeaf {
>> return self.properties.count > 0;
>> }
>>
>> *isn't* KVO compliant.
>
> Hmm? As long as you return a set containing "properties" from +keyPathsAffectingIsLeaf, and your class is KVO compliant for "properties", this should also be KVO compliant.
Well, yes, but that's a big "as long as". ;) I mean, it's not hard to do that, but it's not something that most developers think of spontaneously.
Anyway, Quincey's point was that that isLeaf getter _in isolation_ doesn't make for a KVO-compliant property. It is a common mistake.
Cheers,
Ken
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