En iOS 11, la altura de la barra UISearch ha aumentado, pero quiero la misma altura que en iOS 10. ¿Cómo hacer eso? Estoy usando el siguiente código para crear el SearchController.

    searchController = UIUtils.searchControllerInitialize(self)
    searchController.searchResultsUpdater = self
    searchController.delegate = self
    searchController.searchBar.delegate = self

    viewTemp = UIView(frame: CGRect(x: 0.0, y: 64.0,width: UIScreen.main.bounds.size.width , height: 44))
    viewTemp.addSubview(self.searchController.searchBar)
    self.view.addSubview(viewTemp);


    class func searchControllerInitialize(_ forViewController: UIViewController) -> UISearchController  {
    let controller = UISearchController(searchResultsController: nil)
    controller.hidesNavigationBarDuringPresentation = true
    // This property dismiss the background the navigation bar
    controller.dimsBackgroundDuringPresentation = false
    controller.definesPresentationContext = true
    forViewController.definesPresentationContext = true
    controller.searchBar.sizeToFit()

    let topView: UIView = controller.searchBar.subviews[0] as UIView
    for subView in topView.subviews {
        if subView.isKind(of: NSClassFromString("UITextField")!) {
            (subView as! UITextField).returnKeyType = UIReturnKeyType.search
            (subView as! UITextField).enablesReturnKeyAutomatically = true
        }
    }

    let viewS = UIView(frame: CGRect(x: 0.0, y: 0.0,width: UIScreen.main.bounds.size.width , height: 64))
    viewS.backgroundColor = UIColor.DTColor()
    controller.view.addSubview(viewS)
    controller.hidesNavigationBarDuringPresentation = false

    if #available(iOS 11.0, *) {
        controller.searchBar.translatesAutoresizingMaskIntoConstraints = false
        controller.searchBar.heightAnchor.constraint(equalToConstant: 44).isActive = true
    }

    return controller
}