Re: Getting added object with KVO
Re: Getting added object with KVO
- Subject: Re: Getting added object with KVO
- From: George Orthwein <email@hidden>
- Date: Tue, 18 Jul 2006 14:39:06 -0400
On Jul 17, 2006, at 5:19 AM, Hannes Petri wrote:
- (void)insertObject:(id)object inCollectionsAtIndex:(int)index
{
[self didChange:NSKeyValueChangeInsertion valuesAtIndexes:
[NSIndexSet indexSetWithIndex:index] forKey:@"collections"];
[collections insertObject:object atIndex:index];
[self didChange:NSKeyValueChangeInsertion valuesAtIndexes:
[NSIndexSet indexSetWithIndex:index] forKey:@"collections"];
}
First line should be willChange. However, you shouldn't need any
willChange/didChange calls at all, unless you are using Manual
observing. Automatic should work fine for you. So try removing those
lines.
http://developer.apple.com/documentation/Cocoa/Conceptual/
KeyValueObserving/Concepts/AutoVsManual.html
The Manual bindings example may also be helpful ("Manual" here
unrelated to Manual KVO), even though it demonstrates
bind:toObject:withKeyPath:options rather than
addObserver:forKeyPath:options:context:.
I added a custom view and was able to observe the itemsArray and get
a valid change dictionary for the inserted/removed objects.
http://homepage.mac.com/mmalc/CocoaExamples/controllers.html
Hope that helps,
George
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