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-[NSDocument fileURL] is observable (KVO). Documented?
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-[NSDocument fileURL] is observable (KVO). Documented?


  • Subject: -[NSDocument fileURL] is observable (KVO). Documented?
  • From: Jerry Krinock <email@hidden>
  • Date: Tue, 1 Jun 2010 14:02:16 -0700

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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