objective c - Safely remove NSView that contains cocoa bindings -

i have inspector pane in app contains bunch of controls. these controls bound model objects through nsarraycontroller. depending on type of object selected displaying different set of inspectors (just how ib works). inspector controller observes array controller's selection, can load required set of inspectors when selection changes.

the problem old set of inspectors isn't removed apparently. through inspector controller doesn't hold strong reference them , removed superview, still stick around , log binding errors console:

[<circle 0x102107df0> valueforundefinedkey:]: class not key value  coding-compliant key width. 

my guess nsarraycontroller holds strong reference controls because of bindings. possible? manually have remove binding before removing control superview? how implement inspector pane this?

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edit: documentation says

neither receiver, nor anobserver, retained.

so guess bindings should removed automatically when removing control, shouldn't it?

the problem there isn't defined order between inspector controller's response selection changing , various inspector views updating in response same thing. so, "wrong" inspectors new array controller selection still there brief time, @ least, , trying access non-existent properties of element objects.

one fix not rely on key-value observing array controller selection switch set of inspectors in , out. rather, have coordinating controller – whichever controlling "selected object" based on user action – clear set of inspectors before changing selection , not switching in new set of inspectors until after has been changed.