在SWIFT上完成触摸拖动时，如何刷新？

您必须在中调用refresh方法scrollViewDidEndDecelerating委托方法UIScrollViewDelegate...所以进口UIScrollViewDelegate在你的ViewController喜欢,

extension YourViewController: UIScrollViewDelegate {
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        if self.refController.isRefreshing {
            self.webviewRefresh()
        }
    }
}

那你的webviewRefresh将会是，

@objc func webviewRefresh(){
        refController.endRefreshing()
        WKWebView.reload()
    }

你的viewDidLoad将会是，

override func viewDidLoad() {
       super.viewDidLoad()
       refController.bounds = CGRect.init(x: 0.0, y: 40.0, width: refController.bounds.size.width, height: refController.bounds.size.height)
       refController.attributedTitle = NSAttributedString(string: "refreshing")
       WKWebView.scrollView.addSubview(refController)
       WKWebView.scrollView.delegate = self
       if contentController.userScripts.count > 0 {
           contentController.removeAllUserScripts()
       }
   }