Round corners for image views on tvOS (Swift 4)

ImageView.swift

// A Swift 4 version of https://gist.github.com/petergp/815ba3bf6b7280c2c01f
private class ImageView : UIImageView {
    private class Layer: CALayer {
        override func addSublayer(_ layer: CALayer) {
            defer { super.addSublayer(layer) }

            let cornerRadiusKey = "_cornerRadius"
            guard let configuration = layer.value(forKey: "_configuration") as? NSObject,
                configuration.responds(to: NSSelectorFromString(cornerRadiusKey)) else {
                return
            }

            configuration.setValue(5, forKey: cornerRadiusKey)
        }
    }

    override class var layerClass: AnyClass {
        return Layer.self
    }
}

Interesting, we opted out from using this solution and reimplemented the parallax effect ourselves.