将 .xib 视图添加为子视图后，视图按钮不再可单击

问：

我有一个视图控制器，其中显示了下面的卡片。我使用 .xib 视图从视图控制器的底部滑动，因为在视图控制器的视图中添加 .xib 视图作为子视图后，即使 .xib 视图折叠，视图控制器按钮也不再可单击。“cardViewController” 是 .xib 视图的名称。

    var cardViewController:FrenchiasCardViewController!
func setupCard()
{
    // Setup starting and ending card height
    endCardHeight = self.view.frame.height * 0.9
    startCardHeight = self.view.frame.height * 0.08

    // Add Visual Effects View
    visualEffectView = UIVisualEffectView()
    visualEffectView.frame = self.view.frame
    self.view.addSubview(visualEffectView)

    // Add CardViewController xib to the bottom of the screen, clipping bounds so that the corners can be rounded
    cardViewController = FrenchiasCardViewController(nibName:"FrenchiasCardViewController", bundle:nil)
    self.view.addSubview(cardViewController.view)
    cardViewController.view.frame = CGRect(x: 0, y: self.view.frame.height - startCardHeight, width: self.view.bounds.width, height: endCardHeight)
    cardViewController.view.clipsToBounds = true

    // Add tap and pan recognizers
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(NewAddressView.handleCardTap(recognzier:)))
    let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(NewAddressView.handleCardPan(recognizer:)))

    cardViewController.handleArea.addGestureRecognizer(tapGestureRecognizer)
    cardViewController.handleArea.addGestureRecognizer(panGestureRecognizer)
}

    let frameAnimator = UIViewPropertyAnimator(duration: duration, dampingRatio: 1) {
            switch state {
            case .expanded:
                // If expanding set popover y to the ending height and blur background
                self.cardViewController.view.frame.origin.y = self.view.frame.height - self.endCardHeight
                self.visualEffectView.effect = UIBlurEffect(style: .dark)

            case .collapsed:
                // If collapsed set popover y to the starting height and remove background blur
                self.cardViewController.view.frame.origin.y = self.view.frame.height - self.startCardHeight

                self.visualEffectView.effect = nil
            }
        }