由于滚动视图，触摸命令不起作用

Question

嗨，我是快速编程的新手。我想创建一个可以允许用户在图像上绘画的应用程序，并且绘画功能可以工作，但是当我添加scrollview时，似乎阻止了应该用于imageView的touch命令，我可以做任何事情允许用户在图像上绘制并保持scrollView？在那里有scrollView，以便用户可以放大和缩小图像

let strokeColor:UIColor = UIColor.red

let lineWidth:CGFloat = 1.0

var path = UIBezierPath()
var shapeLayer = CAShapeLayer()
var croppedImage = UIImage()

@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
    super.viewDidLoad()
    imageView.image = img
    self.scrollView.minimumZoomScale = 1.0
    self.scrollView.maximumZoomScale = 6.0

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func viewForZooming(in scrollView: UIScrollView) -> UIView? {
    return self.imageView
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first as UITouch?{
        let touchPoint = touch.location(in: self.imageView)
        path.move(to: touchPoint)
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first as UITouch?{
        let touchPoint = touch.location(in: self.imageView)
        path.addLine(to: touchPoint)
        addNewPathToImage()
    }
}

override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first as UITouch?{
        let touchPoint = touch.location(in: self.imageView)
        path.close()
    }
}

func addNewPathToImage(){
    shapeLayer.path = path.cgPath
    shapeLayer.strokeColor = strokeColor.cgColor
    shapeLayer.fillColor = UIColor.clear.cgColor
    shapeLayer.lineWidth = lineWidth
    imageView.layer.addSublayer(shapeLayer)
}