在嵌入式collectionView上关闭viewController平移-Swift-以编程方式

如何解决在嵌入式collectionView上关闭viewController平移-Swift-以编程方式

我通过panGesture使用 UIViewControllerInteractiveTransitioningDelegate 展示和关闭ViewController：

panDown = UIPanGestureRecognizer(target: self,action: #selector(handleGesture(_:)))
    panDown.delegate = self
    view.addGestureRecognizer(panDown)

  @objc fileprivate func handleGesture(_ gesture: UIPanGestureRecognizer){
    let translate = gesture.translation(in: gesture.view)
    let percent   = translate.y / gesture.view!.bounds.size.height
    if gesture.state == .began {
        interactionController = UIPercentDrivenInteractiveTransition()
        customTransitionDelegate.interactionController = interactionController
        
        dismiss(animated: true)
    } else if gesture.state == .changed {
        interactionController?.update(percent)
    } else if gesture.state == .ended {
        let veLocity = gesture.veLocity(in: gesture.view)
        interactionController?.completionSpeed = 0.999
        if (percent > 0.5 && veLocity.y == 0) || veLocity.y > 0 {
            interactionController?.finish()
        } else {
            interactionController?.cancel()
        }
        interactionController = nil
    }
}

ViewController视图的组织方式如下：

如果我想关闭ViewController的平移，则只能在平移实际的ViewController视图（图像中的红色区域）时执行。

我的目标是即使在collectionView到达其内容的顶部时也可以将viewController向下拖动。 直到现在，我注意到，如果我在collectionView上添加panGestureRecognizer，我实际上可以将其向下拖动，但是我无法滚动collectionView元素。