The docs for  NSTreeNode -mutableChildNodes states:

"The array that is returned is observable using key-value observing."

This doesn't seem to make any sense nor does it seem to be true.

What does seem to be true is that NSTreeNode - childNodes is observable using 
key-value observing.
When -mutableChildNodes is mutated a KVO notification is raised for childNodes.

An NSTreeNode instance can therefore observe its childNodes with:

[self addObserver:self forKeyPath:@"childNodes" options:0 context:someContext];

Sorting the node children using NSTreeNode -sortWithSortDescriptors also 
generates a KVO notification on  the childNodes path.

I would seem then that childNodes can be observed to provide the same sort of 
binding behaviour as NSArrayController - arrangedObjects.

Regards

Jonathan Mitchell

Developer
Mugginsoft LLP
http://www.mugginsoft.com







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