macOS Core Animation Color Transitions

[Darkroom]

i have a view with "Wants Core Animation Layer" checked in IB, and i'm trying to animate between the colors set by the IBActions:

- (IBAction)backgroundBlack:(id)sender
	{
	[[self animator] setBackgroundColors:[NSArray arrayWithObjects:[NSColor blackColor], nil]];
	}

- (IBAction)backgroundWhite:(id)sender
	{
	[[self animator] setBackgroundColors:[NSArray arrayWithObjects:[NSColor whiteColor], nil]];
	}

the view switches colors, but it doesn't animate (EX: Preview > Preferences > General > Window Background)

coding [self animator] setFrame: is the way i make my window resize with CA, so is this not the same with [self animator] setBackgroundColors:?

 

[kpua]

The animator proxy is only able to create implicit animations for a few properties like frame size/origin, opacity, rotation, and so on.

"backgroundColors" is a special property of NSCollectionView and therefore not animatable by the animator by default. Don't quote me on this, but you might be able to set up a custom property animation for this... I know there is support for custom property animations, but I'm not sure where to begin implementing it.

Also, just because Preview animates its background color, that doesn't mean they use -animator to do it, or even use Cocoa at all. They're probably modifying the layer's property directly.

 

[Darkroom]

humm... i suppose setting this up with an NSTimer would be more ideal with my skill set... but i can't even see that being possible