In a window displaying a "widget" object I am using an outlineview
bound to an NSTreeController as master view. When I notice the OV
selection change via outlineViewSelectionDidChange I filter a
tableview bound to an NSArrayController in one of two ways like so...
Method 1 :: use setFilterPredicate on the NSArrayController and set to
a new NSPredicate
Method 2 :: In IB bind the NSArrayController's Filter Predicate to a
property called myPredicate and use KVC to set a new NSPredicate
Either of these methods work fine - the tableview's content filters
fine. The problem I am having is that when I load a new widget, thus
releasing the current widget view from the window, along with it's
NSViewController, I get the error...
Cannot remove an observer <_NSArrayControllerExtensions 0x12c8b30> for
the key path...
I have googled and found this is typically to do with non KVO
compliant models. I have checked and rechecked my models and made sure
that all properties are compliant with KVO. While debugging I removed
resetting the NSPredicate in outlineViewSelectionDidChange and instead
just set it once in awakFromNib and the issue goes away. This brings
me to the conclusion that somehow resetting the NSPredicate for the
NSArrayController is not allowed.
How should I go about filtering my tableview? Should it be okay to
reset the NSArrayController's filterPredicate... ie is there something
else going on?
Thanks in advance for any suggestions.
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