Re: cocoa-dev digest, Vol 2 #3323 - 6 msgs
Re: cocoa-dev digest, Vol 2 #3323 - 6 msgs
- Subject: Re: cocoa-dev digest, Vol 2 #3323 - 6 msgs
- From: David Webster <email@hidden>
- Date: Tue, 9 Dec 2003 18:08:42 +0000
>
> I have a problem getting back a value from NSUserDefaults that I write
>
> to from a popup button bound to NSUserDefaultsController. I need to
>
> have my preference controller notified when this popup changes as I
>
> need to set the state of other widgets based on this popup.
>
>
Why not just create a binding in each of the other controls between
>
their value and the same key in the Shared User Defaults controller?
>
>
That way, you can let the controller architecture do all of the heavy
>
lifting.
>
Because I need to intercept the change notice to do other things
besides just toggling widgets. I tried to keep the original post simple
to demonstrate the problem.
My question is still why does the change object appear to be invalid
(see original post)
- (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"values.DPMetricImperialState"]) {
// gets to here OK
id obj = [change objectForKey:NSKeyValueChangeNewKey];
int tag = [obj intValue];
// its gone into the ether by here but it is the objectForKey:
where I am sure it fails
}
I know I can get the value by doing the following
int tag = [[[[NSUserDefaultsController sharedUserDefaultsController]
defaults] objectForKey:@"DPMetricImperialState"] intValue];
and that works but as I am passed the change object by the above method
- why can't I use it?. Is it a bug?
Thanks
David
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