On Apr 11, 2008, at 12:10 AM, Quincey Morris wrote:
Well, without knowing the details of what you're doing, it's
impossible to be certain, but this code certainly looks *very*
wrong. For one thing, 'insertObject' is (according to the
documentation) for controller subclasses to use to customize their
own behavior, not for other things to use to insert objects.
Normally, you don't want to mess with trying to change
arrangedObjects directly.
For another thing, assuming you're approaching this using MVC design
principles, this code gets things exactly backwards -- when setting
up your data model, you don't make changes to the controller and
expect them to be reflected in the model -- you make changes in the
model and let them be reflected (via the controller) in the view.
Again assuming there's nothing very strange intended here, all you
need to do is update treeContent in a KVO-compliant way, which (in
the case of arrays) is:
[[myDocument mutableArrayValueForKey:@"treeContent"]
addObject:rootnode];
(or some variant such as insertObject...) and the tree controller
will see the change and update the user interface.
There are also other ways to change treeController in a KVO-
compliant way, but mutableArrayValueForKey seems the most direct in
this case.
I got it to work. What you say makes a lot of sense now, thanks very
much for helping me understand what really was wrong with the code. Of
course it solved the leaking problem and works really nicely. I'm new
to the concept that a node (or any object) will change its class to
something else once added to the KVO structure appropriately and
"learns" new things as it's added. It's quite cool.
Thanks again!
Regards
Markus
PS: Question remains why Apple doesn't know how to really do this -
it's the sample project I got this code from.
--
__________________________________________
Markus Spoettl
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