var header : StretchHeader!

  override func viewDidLoad() {
        super.viewDidLoad()

        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "TableViewCell")

        setupHeaderView()
    }

    func setupHeaderView() {

        let options = StretchHeaderOptions()
        options.position = .underNavigationBar

        header = StretchHeader()
        header.stretchHeaderSize(headerSize: CGSize(width: view.frame.size.width, height: 220),
            imageSize: CGSize(width: view.frame.size.width, height: 220),
            controller: self,
            options: options)
        header.imageView.image = UIImage(named: "photo_sample_05")

        // custom
        let label = UILabel()
        label.frame = CGRect(x: 10, y: header.frame.size.height - 40, width: header.frame.size.width - 20, height: 40)
        label.textColor = UIColor.white
        label.text = "StrechHeader Demo"
        label.font = UIFont.boldSystemFont(ofSize: 16)
        header.addSubview(label)

        tableView.tableHeaderView = header
    }

    // MARK: - ScrollView Delegate
    override func scrollViewDidScroll(_ scrollView: UIScrollView) {
        header.updateScrollViewOffset(scrollView)
    }