On 17 Jul 2012, at 22:41, Markus Spoettl wrote: > Hello, > > I have an NSArrayController (automaticallyRearrangesObjects = YES) on which > I set a filterPredicate in code (not through bindings). Most of the time, > rearranging works but in one 100% reproducible case, the controller produces > an empty arrangedObjects array when it should produce a non-empty one. > > It always happens if a certain predicate (A) was set before the predicate > that produces the wrong result (B) is set. If any another predicate (or none) > is set when setting (B), arrangedObjects is correctly populated. This is > completely reproducible. > > When I call rearrangeObjects on the array controller, the result gets > rectified. However, even with automaticallyRearrangesObjects = NO, the array > controller rearranges automatically so when I rearrange manually after > setting the filter, I get two KVO change notifications for arrangedObjects > which can be very costly and I'd really like to avoid that. > > Any ideas on how to force NSArrayController to (1) either produce a correct > result automatically or (2) prevent to do any rearranging by itself when a > filterPredicate is set?
Try subclassing NSArrayController and providing a custom implementation of -arrangeObjects: Even if you do nothing but set a breakpoint and call super, it’ll give you a better idea of quite what the rearrangement is doing, and what’s triggering it. _______________________________________________ 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
