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Custom CALayer Action as animation key?

Subject: Custom CALayer Action as animation key?
From: Patrick Mau <email@hidden>
Date: Mon, 20 Oct 2008 17:58:51 +0200
Delivered-to: email@hidden
Delivered-to: email@hidden

Good afternoon,

I have implemented a layer-based view that acts as the layer delegate and defines a layer action named "test". Afterwards I create a CABasic animation to animate the test property. If you look at the line marked 'THIS WORKS", you'll see that sending "setValue:forKey" triggers a message "runActionForKey:object:arguments", but using the property for a basic animation will not trigger the CAAction.

So here's my simple question. What is needed to "animate" a generic property named test? Did I mis-read the documentation and wrongly assumed that any property can be used as long as there's a CAAction?

By the way, changing the "keyPath" to something like "bounds.size.width" works as expected.

The small zip is at:

http://oscar.homelinux.net/layer.zip

Please don't mind the coding style.

Thanks a lot,
Patrick

--- Small excerpt ---

/* Debug invocation of CAAction */ - (void) runActionForKey:(NSString *)key object:(id)object arguments: (NSDictionary *)dict { NSLog(@"runActionForKey:\"%@\" object:%p arguments:%p", key, object, dict); }

/* Get the CAAction for "test", or nil for all others */ - (id<CAAction>) actionForLayer:(CALayer *)theLayer forKey:(NSString *)theKey { id res = [theLayer.actions valueForKey:theKey]; NSLog(@"actionForLayer:%p forKey:\"%@\" = %p", theLayer, theKey, res); return res; }

/* Create the layer, initialize action, animate "test" property */ - (void) createLayer { // ... content = [CALayer layer]; content.actions = [NSDictionary dictionaryWithObjectsAndKeys:self, @"test", nil]; // ... [content setDelegate:self]; [content setNeedsDisplay];

    // THIS WORKS!
    [content setValue:[NSNumber numberWithInt:19] forKey:@"test"];

    // THIS does not work.
    CABasicAnimation *anim = [CABasicAnimation animation];
    anim.keyPath = @"self.test";
    anim.duration = 1.0;
    anim.repeatCount = 1.0e100;
    anim.autoreverses = YES;
    anim.fromValue = [NSNumber numberWithFloat:0.0];
    anim.toValue = [NSNumber numberWithFloat:1.0];
    [content addAnimation:anim forKey:@"test"];
}

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