我最终使用了一种不同的方法，它可能对许多情况都有用：如果在hitTest（）中无法获取touchType，我仍然可以使用GestureRecognize获取touchType：

class CustomGestureRecognizer : ImmediatePanGesture {
    var beganTouch : UITouch!
    var movedTouch : UITouch!
    var endedTouch : UITouch!

    override func shouldReceive(_ event: UIEvent) -> Bool {
        // You can check for touchType here and decide if this gesture should receice the touch or not
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        // Save touch for later use
        if let firstTouch = touches.first {
            beganTouch = firstTouch
        }
        super.touchesBegan(touches, with: event)
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) {
        // Save touch for later use
        if let touch = touches.first {
            movedTouch = touch
        }
    
        super.touchesMoved(touches, with: event)
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) {
        // Save touch for later use
        if let touch = touches.first {
            endedTouch = touch
        }
    
        super.touchesEnded(touches, with: event)
    }
}

在gestureRecognizer的目标函数中，可以通过以下方式获取UITouch：

let beganTouch = customGesture.beganTouch
let touchType = beganTouch.touchType