animating MTKView bounds

I have a MTKView in a window with other views to the sides. I'm trying to animate the layout of the these controls in such a way that the MTKView changes size during the animation.


However, no matter what I try, the MTKView bounds seem to only update once at the start of the animation, rather than tracking the frame change during resize. Has anyone made this work? Will I have better luck rolling my own with CAMetalLayer?


mike