快速将蒙版转换为带有动画的另一个蒙版

Question

我想更改动画中的蒙版

但是就像在没有动画的情况下更改另一个蒙版一样 screen record

我希望它看起来像this

func creatMask(_ index: Int) -> CALayer {
    let layer = CALayer()
    let image = [#imageLiteral(resourceName: "bubble_1.png"),#imageLiteral(resourceName: "bubble_2.png"),#imageLiteral(resourceName: "bubble_3.png"),#imageLiteral(resourceName: "bubble_4.png"),#imageLiteral(resourceName: "bubble_5.png")]
    layer.contents = image[index].cgImage
    layer.contentsScale = image[index].scale
    layer.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
    return layer
}

@objc func transform() {
    UIView.animate(withDuration: 1) {
        self.redView.layer.mask = self.creatMask(1)
    }
}

}