UIStackView in a UIScrollView

UIScrollView+UIStackView.swift

import UIKit

public extension UIScrollView {
    convenience init(stackView: UIStackView) {
        self.init(frame: .zero)

        stackView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(stackView)

        NSLayoutConstraint.activate([
            stackView.topAnchor.constraint(equalTo: contentLayoutGuide.topAnchor),
            stackView.bottomAnchor.constraint(equalTo: contentLayoutGuide.bottomAnchor),
            stackView.leadingAnchor.constraint(equalTo: safeAreaLayoutGuide.leadingAnchor),
            stackView.trailingAnchor.constraint(equalTo: safeAreaLayoutGuide.trailingAnchor),
            contentLayoutGuide.widthAnchor.constraint(equalTo: widthAnchor),
        ])
    }
}