That's because you're getting an object pointer back, and any object pointer
except for nil evaluates to true. Assuming you know it will only be one object
inserted at a time, you'd want to do [[change
objectForKey:NSKeyValueChangeNewKey] boolValue].
Cheers,
Chuck
----- Original Message ----
> From: Andre Masse <[EMAIL PROTECTED]>
> To: Cocoa Developers <cocoa-dev@lists.apple.com>
> Sent: Tuesday, November 11, 2008 5:08:20 PM
> Subject: BOOL madness
>
> Hi,
>
> I'm having trouble converting an object to a BOOL. In my window controller,
> I'm
> observing the model keyPath isDirty which is a BOOL.
>
> version 1
> ----------------
> - (void) observeValueForKeyPath:(NSString *)keyPath
> ofObject:(id)object
> change:(NSDictionary *)change
> context:(void *)context
> {
> if(object == model) {
> if([keyPath isEqualToString:@"isDirty"]) {
> [self setDocumentEdited:[change
> objectForKey:NSKeyValueChangeNewKey]];
>
> }
> }
>
> }
>
> This doesn't work. No matter what the value of isDirty is, setDocumentEdited:
> is
> always called with YES;
>
>
> So, I add some logging, flags and everything to see what's going on:
>
> version 2
> ----------------
> - (void) observeValueForKeyPath:(NSString *)keyPath
> ofObject:(id)object
> change:(NSDictionary *)change
> context:(void *)context
> {
> if(object == model) {
> if([keyPath isEqualToString:@"isDirty"]) {
> BOOL flag = [change
> objectForKey:NSKeyValueChangeNewKey];
> NSLog(@"change value = %@", [change
> objectForKey:NSKeyValueChangeNewKey]);
> if(flag) {
> [self setDocumentEdited:YES];
> }
> else {
> [self setDocumentEdited:NO];
> }
>
> }
> }
> }
>
> Now, the logging shows that [change objectForKey:NSKeyValueChangedNewKey]
> toggle
> between 0 and 1 according to the value of isDirty, but flag is always YES...
> I
> also tried using a plain c bool and got the same result (true). Any idea what
> I'm doing wrong?
>
> Thanks,
>
> Andre Masse
>
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