CATransition黑色阴影

Question

我想要做的是为我的模态呈现视图控制器创建自定义过渡效果(仅用于解除它).我只是希望它看起来像原始但更慢.问题是我的模态呈现VC和VC之间的黑色阴影我想回去.

到目前为止,这是我的代码:

let transition: CATransition = CATransition()
transition.duration = 0.6
transition.type = kCATransitionReveal
transition.subtype = kCATransitionFromBottom
self.view.window!.layer.add(transition, forKey: nil)
self.dismiss(animated: false, completion: nil)