I would like to blend a UIView with my app's background, using a special blend mode (in my case, the Overlay mode). However, the view to blend is contained in a complex hierarchy of views.Blending a view with its direct siblings can be achieved using view.layer.compositingFilter = "overlayBlendMode", but the view won't blend with non-siblings views, like the app background. To recreate the problem, I made the following playground:import UIKitimport PlaygroundSupportclass MyViewController : UIViewController { override func loadView() { let parentView = UIView() parentView.backgroundColor = .purple // Child view let childView = UIView(frame: CGRect(x: 50, y: 50, width: 200, height: 200)) childView.layer.borderColor = UIColor.orange.cgColor childView.layer.borderWidth = 3 parentView.addSubview(childView) // Child child view let childChildView = UIView(frame: CGRect(x: 50, y: 50, width: 100, height: 50)) childChildView.backgroundColor = .white childChildView.layer.compositingFilter = "overlayBlendMode" childView.addSubview(childChildView) self.view = parentView }}// Present the view controller in the Live View windowPlaygroundPage.current.liveView = MyViewController()Screenshots of what the result should look like are available here.Note 1: the blended view is supposed to move, because it's inside a UIScrollView.Note 2: my app background could be a gradient or an image, so I can't just change the color of the child view to make it the same as background.