在CALayer上动画“转换”属性时消除锯齿效果？

I have a CALayer with a circle drawn to it at its final size. I want to animate the circle in, such that it starts at 1% scale and finishes at 100%. Right now the animation is not very smooth because the edges flicker while it's scaling. At the final size the circle looks right. I'm wondering if there's a way to have anti-aliasing during the animation itself. I have a CALayer with a circle drawn to it at i