UITableView+HeaderView.swift

extension UITableView {
    func updateTableHeaderView(with view: UIView?) {
        guard
            let view = view
        else {
            tableHeaderView = nil
            return
        }
        let containerView = UIView()
        containerView.translatesAutoresizingMaskIntoConstraints = false
        containerView.addSubview(view)
        NSLayoutConstraint.activate([
            view.topAnchor.constraint(equalTo: containerView.topAnchor),
            view.bottomAnchor.constraint(equalTo: containerView.bottomAnchor),
            view.leadingAnchor.constraint(equalTo: containerView.layoutMarginsGuide.leadingAnchor),
            view.trailingAnchor.constraint(equalTo: containerView.layoutMarginsGuide.trailingAnchor)
        ])
        tableHeaderView = containerView
        NSLayoutConstraint.activate([
            containerView.centerXAnchor.constraint(equalTo: centerXAnchor),
            containerView.topAnchor.constraint(equalTo: topAnchor),
            containerView.widthAnchor.constraint(equalTo: widthAnchor)
        ])
        tableHeaderView?.layoutIfNeeded()
        tableHeaderView = self.tableHeaderView
    }
}