Hi,
I had a problem this morning, and I am wondering if the behavior I've
observed was normal or not.
I needed to use KVO on some object and wasn't able to figure why this
didn't work. I spent some time figuring out what was happening (since
it was the first time I used KVO, I started to blame my code).
Reducing the problem, I finally found that my code didn't work because
my observer was a subclass CALayer.
I attached the code that doesn't work (the observer method is not
called).
If I make it a subclass of NSObject, it works. Is this a correct
behavior or a bug ?
@interface Application : CALayer {
NSString *manager;
}
@property (retain) NSString *manager;
@end
@implementation Application
@synthesize manager;
- (id) init
{
self = [super init];
if (self != nil) {
[self addObserver:self forKeyPath:@"manager" options:0
context:NULL];
[NSTimer scheduledTimerWithTimeInterval:1 target:self
selector:@selector(fired:) userInfo:nil repeats:NO];
}
return self;
}
-(void)fired:(id)sender
{
[self setManager:@"foo"];
[self setManager:nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
NSLog(@"Observed: %@ = %@", keyPath, [self manager]);
}
@end
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