best method for observing changes in NSArrayControllers content
best method for observing changes in NSArrayControllers content
- Subject: best method for observing changes in NSArrayControllers content
- From: Michael Link <email@hidden>
- Date: Thu, 16 Feb 2006 16:23:17 -0600
I have an instance of NSArrayController (lets call it controller1)
that has its contentArray bound to the arrangedObjects of another
NSArrayController (lets call it controller0). controller1 also sets a
filterPredicate (e.g. the predicate filters red colored objects).
I've noticed that the content of controller1 is only updated when
arrangedObjects changes in controller0 (as expected). But if I
changed the color of one of the objects in controller0 to say blue,
it doesn't update in controller1. I think I need to somehow observe a
key of all the objects in controller0 and send controller1 a
rearrangeObjects. I'm wondering what the best method for this might
be? Subclass NSArrayController and KVO the objects as they are
inserted? Which method needs to be subclassed, addObject? setContent?
If I subclass setContent can I call addObserver on a KVO compliant
object multiple times? Do I have to remove the observer before the
object is released, or will that happen automatically? Thanks for any
insight.
--
Michael
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