On Jun 29, 2009, at 6:09 PM, Tim Schmidt wrote:
first of all, thanks for reading this. I have a basic KVO question.
In one of my NIBs I have an NSArrayController and a
NSSegmentedControl with add/remove segments for the array of said
controller. Now I want to enable the remove-segment according to the
controllers canRemove message. I've set the NIB's viewcontroller as
an observer of the arraycontroller's canobserve property as follows:
[statesController addObserver:self forKeyPath:@"canRemove"
options:NSKeyValueObservingOptionNew
context:PED_CAN_REMOVE_STATE_CONTEXT];
and receive the obligatory change notifications alright, but the
change dictionary always contains an NSNull instance for the
NSKeyValueChangeNewKey instead of the NSNumber bool subclass I would
expect. Am I doing something wrong here?
This is probably due to a known bug that will not likely ever be
fixed. In your particular case, it doesn't matter, as the value will
have been changed before you receive the observer message.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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