核心动画不起作用。物体消失
[animationImageView setWantsLayer:YES];
CAKeyframeAnimation *keyframeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
keyframeAnimation.values = [animationsBindingsController valueForKeyPath:@"selection.controlPoints"];
keyframeAnimation.duration = 5;
[animationImageView.layer addAnimation:keyframeAnimation forKey:@"position"];
[pageContent addSubview:animationImageView];
AnimationImageView 是 NSImageView 的子类。
animationImageView 对象消失 5 秒（动画持续时间），然后突然出现在初始位置。
[animationImageView setWantsLayer:YES];
CAKeyframeAnimation *keyframeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
keyframeAnimation.values = [animationsBindingsController valueForKeyPath:@"selection.controlPoints"];
keyframeAnimation.duration = 5;
[animationImageView.layer addAnimation:keyframeAnimation forKey:@"position"];
[pageContent addSubview:animationImageView];
AnimationImageView is a subclass of NSImageView.
animationImageView object disappears for a 5 seconds (for a duration of animation), and suddenly it appears in init position.
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好吧，我没有子类化 NSImageView，而是子类化 CALayer（通过方法 setContents：你可以设置 NSImage）。核心动画完美运行！
Ok, Instead of subclassing NSImageView, I subclassed CALayer (by method setContents: you can set NSImage). Core Animation works perfectly!