On 2009 Dec 05, at 22:43, Jerry Krinock wrote:
> I tested a new build of an app today and found that, all of a sudden,
> clicking the "+" button for a table view adds a new object but no longer
> selects it.
The problem was that I was invoking the array controller's -newObject, *then*
inserting it with
[arrayController insertObject:newObject
atArrangedObjectIndex:([arrayController selectionIndex] + 1) ;
I didn't realize that -newObject had already inserted, so the effect this was
to insert the same object into the content array twice. Now I guess that when
the Core Data model KVOed this view change, it registered a set containing only
unique object, apparently the one that was not selected, and then when the
array controller KVOed this model change, it deleted the one that was selected.
Very cute.
So, have no doubts about NSArrayController's "Select Inserted Objects". It
works.
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