On May 11, 2010, at 2:42 PM, Quincey Morris wrote:
> On May 11, 2010, at 12:45, Joanna Carter wrote:
>
>> Only if you implement the KVO pattern in the setters:
>>
>> - (void) setCornerSize:(NSSize) _size
>> {
>> [self willChangeValueForKey:@"CornerSize"];
>> [[self cell] setCornerSize:_size];
>> [self didChangeValueForKey:@"CornerSize"];
>> }
>
> Um, not so much. :)
>
> In the normal case, setters *should not* call will/didChangeValueForKey,
> since the entire setter is (invisibly) enclosed in a pair of such calls. It's
> harmless (AFAIK), because KVO explicitly suppresses the recursion implied by
> calling them within the setter, but it's absolutely unnecessary. Unless ...
In my experience, doing this will actually raise application-breaking
exceptions in many cases, unless this has been solved by a recent OS release. I
suspect that the API does *not* do any checking, or doesn't check in every
case. Unless, of course, this has been "fixed" since I came across it last,
which is possible but I would be surprised since it is developer-fault anyway.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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