BufferView - useful for custom padding in a stackview

BufferView.swift

import UIKit

class BufferView<Child: UIView>: UIView {
    override var layoutMargins: UIEdgeInsets {
        didSet { configure() }
    }
    override var isHidden: Bool {
        didSet { configure() }
    }

    let view = Child()

    override init(frame: CGRect) {
        super.init(frame: frame)
        configure()
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        configure()
    }
    private func configure() {
        view.removeFromSuperview()

        if !isHidden {
            addSubview(view)
            applyConstraints(to: view)
        }
    }

    private func applyConstraints(to view: UIView) {
        view.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            view.leftAnchor.constraint(equalTo: layoutMarginsGuide.leftAnchor),
            view.rightAnchor.constraint(equalTo: layoutMarginsGuide.rightAnchor),
            view.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
            view.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor),
        ])
    }
}