Hi,
I have a view with a subview. The subview is rotated by a drag operation, when
I change the subview transform property.
Now I'm trying to set the view as observer of subview transform property, like
this:
[subView addObserver:self forKeyPath:@"transform"
options:NSKeyValueObservingOptionNew context:@"subViewRotation"];
And in the superview I added just this:
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context {
NSLog(@"%@ - %@ - %@", keyPath, object, context);
}
But this code is never called.
I also tried
[subView addObserver:self forKeyPath:@"transform"
options:NSKeyValueObservingOptionNew context:@"subViewRotation"];
which also didn't work.
What I'm doing wrong?
Is there a good reference about KVO? I have already read the KVO Quick start
guide and Key-Value Observing Programming Guide, but maybe someone have a
better reference.
Thank you
Tales
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