On May 14, 2012, at 10:40 AM, Kyle Sluder wrote: > On May 14, 2012, at 1:06 AM, Quincey Morris > <[email protected]> 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 _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
