On Feb 6, 2015, at 01:56:24, Quincey Morris <quinceymor...@rivergatesoftware.com> wrote:
> You can’t bind *through* an array or set collection class. However, you can > use these: > > > https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/KeyValueCoding/Articles/CollectionOperators.html > On Feb 6, 2015, at 02:03:34, Ken Thomases <k...@codeweavers.com> wrote: > You can't use KVO or bindings through arrays or sets, even to their immediate > properties. > > For KVC, if you were to attempt to do [theTableCellView > valueForKeyPath:@"objectValue.images.count"], that would attempt to get the > "count" property of each _element_ of objectValue.images and return a set > containing all of those counts (wrapped in NSNumbers). In theory, if KVO > through sets worked, then observing the key path objectValue.images.count > would not notify you when the count of objectValue.images changed. It would > notify you when the set returned by [theTableCellView > valueForKeyPath:@"objectValue.images.count"] changed (or might have changed). > That's not what you want, anyway. > > However, there are collection operators > <https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/KeyValueCoding/Articles/CollectionOperators.html>, > including @count. You can bind to that with model key path > objectValue.images.@count. Weeeellll doggies! Just when I was about to go to bed, you guys come through with the goods and make my night. :) Thanks so much. I need to read the KVC and KVO articles again. -- Steve Mills Drummer, Mac geek _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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 arch...@mail-archive.com
