A source code for demonstrating working of a vertically scrolling content view

VerticalScrollView.swift

class VerticalScrollView : UIViewController {

    init() {
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private let stackView: UIStackView = {
        let stackView = UIStackView()
        stackView.translatesAutoresizingMaskIntoConstraints = false
        stackView.axis = .vertical
        stackView.spacing = 20
        return stackView
    }()

    private let scrollView: UIScrollView = {
        let scrollView = UIScrollView()
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        scrollView.showsVerticalScrollIndicator = false
        return scrollView
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        setupViews()
    }

    private func setupViews() {
        view.backgroundColor = .white

        view.addSubview(scrollView)
        scrollView.addSubview(stackView)

        scrollView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
        scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true

        stackView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true
        stackView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        stackView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true

        for i in 0..<10 {
            let label = UILabel(frame: .zero)
            label.translatesAutoresizingMaskIntoConstraints = false
            label.numberOfLines = 0
            label.text = "Line 1 ds d asd as das d s sdf sd fsd fsd fsd f sdf sdf sdf sd fsd fs df sd fsd fsd f\(i)\nLine 2\(i)\nLine 3\(i)"
            label.heightAnchor.constraint(greaterThanOrEqualToConstant: 0).isActive = true
            stackView.addArrangedSubview(label)
            label.widthAnchor.constraint(equalTo: stackView.widthAnchor).isActive = true
        }
    }
}