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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