On Sep 12, 2013, at 9:11 AM, Benjamin Rindt wrote: > I'm really confused with the array controller and core data. I don't know > what I have to use to get what I want. > My program has for now a CollectionView which is populated by a core data > fetch request. > > If I use an arrayController, I don't have to make this fetch do I? I can tell > the array controller to fetch: ?
You don't even need to call -fetch: in most cases--the array controller can fetch itself when automaticallyPreparesContent is set. > Next thing is, when new Items are added to the collection view, it should > automatically change. > A binding of the collection view is enough? Something like [collectionview > bind: toObject:….] Not in your case. There is no way I can think of via pure KVO that the array controller would know that its fetched set may have changed. It might if you use NSArrayController's methods to add/remove objects, and if so you would also get undo support for free, but I don't remember whether it works for fetched results (works really well for relationships). > And, for now I add data to my core data database with > insertNewObjectForEntityForName. Is that okay or should I add it with the > array controller's add oder insertObject methods? The new entries have to > keep their relationships and I don't know how I can define them with the > array controller methods. You could try using NSArrayController's methods, and if that doesn't work, then you need to tell the array controller to refetch whenever items are added/removed, either in the add/remove methods or similar in an NSArray subclass. HTH, Keary Suska Esoteritech, Inc. "Demystifying technology for your home or business" _______________________________________________ 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
