To clarify: Mike is of course correct that any class that doesn't have
an override of +automaticallyNotifiesObserversForKey: which returns no
for a given key, and that always sets values of that key in a
KVC-compliant manner, will generate KVO notifications for that key.
And there are many Cocoa classes that have not bothered to override
+automaticallyNotifiesObservesrForKey:. But one should *not* develop
the expectation that most, or even a substantial portion, of Cocoa is
KVO-compliant, because it is not.
--Kyle Sluder
On Tue, Jun 1, 2010 at 2:15 PM, Mike Abdullah <cocoa...@mikeabdullah.net> wrote:
> By default Cocoa classes use automatic KVO. So long as Cocoa always changes
> the URL by calling -setFileURL: you will get proper notifications.
>
> On 1 Jun 2010, at 22:02, Jerry Krinock wrote:
>
>> There is no mention in -[NSDocument fileURL] documentation, nor in 10.5 or
>> 10.6 release notes, that this property is observable using KVO. But when I
>> added some code to do this, created a document, and renamed the document in
>> Finder while the document was open, my observer logged a hit.
>>
>> Is there some underlying or other documentation I don't know about?
>>
>> Jerry Krinock
>>
>>
>> - (void)observeValueForKeyPath:(NSString*)keyPath
>> ofObject:(id)object
>> change:(NSDictionary*)change
>> context:(void*)context {
>> NSLog(@"2796: keyPath %@ observed:\n%@", keyPath, change) ;
>> }
>>
>> - (id)init {
>> self = [super init] ;
>> if (self != nil) {
>> [self addObserver:self
>> forKeyPath:@"fileURL"
>> options:NSKeyValueObservingOptionNew
>> context:NULL] ;
>> }
>>
>> return self ;
>> }
>>
>> - (void)dealloc {
>> [self removeObserver:self
>> forKeyPath:@"fileURL"] ;
>>
>> ...;
>> [super dealloc];
>> }
>>
>>
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