import UIKit
import SceneKit

class CustomScrollView: UIView {

    override init(frame: CGRect) {
        super.init(frame: frame)

        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(panView(with:)))
        addGestureRecognizer(panGesture)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    @objc fileprivate func panView(with gestureRecognizer: UIPanGestureRecognizer) {

        let translation: CGPoint = gestureRecognizer.translation(in: self)
        UIView.animate(withDuration: 0.20) {
            self.bounds.origin.y = self.bounds.origin.y - translation.y
        }
        gestureRecognizer.setTranslation(.zero, in: self)
    }
}

@objc func nodeWasTapped(_ recognizer: UITapGestureRecognizer) {

    guard let sceneView = recognizer.view as? ARSCNView else { return }

    let touchLocation: CGPoint = recognizer.location(in: sceneView)

    let hitResults = sceneView.hitTest(touchLocation, options: [:])
    if !hitResults.isEmpty {

        guard let hitResult = hitResults.first  else { return }

        if let node = hitResult.node as? SCNNode {
            // ...
        }
    }
}