10.7 SDK, 10.7 target. The content view of the window is layer-hosting, containing only a CALayer.
I'm trying to crossfade the contents image of the CALayer from Image A (the existing contents) to Image B (the new contents). Surely this is simple. I'm thrashing. Here is an excerpt from my controller object's set-image method. I've seen the following code (more or less) in responses on the Web, and it has always met with apparent satisfaction, but it does not work as I intend: Image A is instantly replaced by Image B, then the crossfade from A to B runs. Image B remains. ===== // Initialize nsImage with the new contents. CABasicAnimation * crossfade; crossfade = [CABasicAnimation animationWithKeyPath: @"contents"]; crossfade.duration = 0.75; crossfade.removedOnCompletion = YES; crossfade.fromValue = self.backgroundLayer.contents; crossfade.toValue = nsImage; [self.backgroundLayer addAnimation: crossfade forKey: nil]; self.backgroundLayer.contents = nsImage; ===== Commenting-out the assignments to .fromValue and .toValue yields the same effect. Okay, try this: add crossfade.delegate = self; before the addAnimation:, and delete self.backgroundLayer.contents = nsImage; Add the delegate method: - (void) animationDidStop:(CAAnimation *)anim finished:(BOOL)flag { NSImage * newImage = [(CABasicAnimation *)anim toValue]; self.backgroundLayer.contents = newImage; } Printing the nsImage pointer in the set-image method and newImage in the animationDidStop: method shows that the two pointers are equal. In this case, the animation runs from Image A to Image B, then jumps to Image A, then jumps to Image B. In all cases, self.backgroundLayer.actions is nil. I'm thrashing at a task that ought to be simple and obvious. What am I missing? — F _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com