移除 iOS 13 中默认向上滑动 animation 时显示的阴影

Question

In iOS 13, there is a drop shadow effect that is visible when sliding down the view that was present.

I've tried to remove it, but I'm not having any luck. The view that slides down is child view which I have added to my controller. I then present the controller and it gives the effect of the view behind it being pushed back, while apply the shadow effect to the whole screen.

I've tried to use the following to remove the shadow, but this doesn't work either.

self.layer.shadowOffset = CGSize(width: 0 , height: 0)
self.layer.shadowColor = UIColor.clear.cgColor
self.layer.cornerRadius = 0.0
self.layer.shadowRadius = 0.0
self.layer.shadowOpacity = 0.0

Where can I get access to this effect and hide it?