带有子视图的UIPinchGestureRecognizer问题

pinchGestureRecognizer.delegate = self

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    if gestureRecognizer == pinchGestureRecognizer {
        let location = gestureRecognizer.location(in: parentView)
        if parentView.point(inside: location, with: nil) {
            return false
        }
    }
    return true
}

let pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(_:)))
childView.addGestureRecognizer(pinchGestureRecognizer)

@objc func handlePinch(_ gestureRecognizer: UIPinchGestureRecognizer) {
    parentView.sendSubviewToBack(childView)
    parentView.transform = parentView.transform.scaledBy(x: gestureRecognizer.scale, y: gestureRecognizer.scale)
    gestureRecognizer.scale = 1.0
}

let transparentView = UIView(frame: parentView.bounds)
transparentView.backgroundColor = .clear
parentView.addSubview(transparentView)

let pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(_:)))
transparentView.addGestureRecognizer(pinchGestureRecognizer)

transparentView.addSubview(childView)