Why the edges of UIView are not smooth for huge corner radius?

Question

class AttributedView: UIView {
    private let gradient = CAGradientLayer()
    var cornerRadius: CGFloat = 3 {
        didSet {
            layer.cornerRadius = cornerRadius
        }
    }
}

I simply use it for both: button view (corner radius: 20) and background circle (corner radius: 600).

Why button is smooth, and background is not?

Answer 1

With iOS 13.0 you can simple do, in addition to setting corner radius

yourView.layer.cornerCurve = .continuous