如何取消UIScrollView缩放弹跳？

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let scrollView = UIScrollView(frame: view.bounds)
        scrollView.delegate = self
        view.addSubview(scrollView)

        let imageView = UIImageView(image: UIImage(named: "example.jpg"))
        imageView.frame = CGRect(x: 0, y: 0, width: scrollView.bounds.width, height: scrollView.bounds.height)
        scrollView.addSubview(imageView)

        scrollView.contentSize = imageView.bounds.size
        scrollView.minimumZoomScale = 0.5
        scrollView.maximumZoomScale = 3.0
        scrollView.bouncesZoom = false
    }
}

extension ViewController: UIScrollViewDelegate {
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        return scrollView.subviews.first
    }
}