Why do not working UIRefreshControl in Swift?

I use the refresh function in WKWebview. The function is normal when performing a refresh. But when I load another html file and come back, it is not refreshed.

 

@IBOutlet var myWebView: WKWebView!
var refController:UIRefreshControl = UIRefreshControl()


override func viewDidLoad() {
    super.viewDidLoad()
    refController.bounds = CGRect.init(x: 0.0, y: 50.0, width: refController.bounds.size.width, height: refController.bounds.size.height)
    refController.addTarget(self, action: #selector(self.webviewRefresh(refresh:)), for: .valueChanged)
    myWebView.scrollView.addSubview(refController)
    ...
}


@objc func webviewRefresh(refresh:UIRefreshControl){
    refController.endRefreshing()
    myWebView.reload()
}


extension mainWebViewController: UIScrollViewDelegate{
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        print("come in ??")
        if currentHtmlFileName == "Main.html" {
            scrollView.bounces = (scrollView.contentOffset.y <= 0)
        } else {
            scrollView.bounces = false
        }
    }
}

 

 

 

As you can see from my code, my WKWebview is scrolling, and the function is executed. However, when the function is activated on a different screen and returned, the function is not called, nor is the refresh working.

 

 

The steps for reproducing a problem are as follows:

 

 

1. Load the WKwebView page and execute the refresh function.

2. Scroll to the bottom screen to see if there is a bounce.

3. If it works normally, go to a different screen. location.href = "./other.html";

4. Scroll from another screen to the bottom screen to see if there is a

    bounce.

5. If there is no bounce normally, please return to the screen. history.back()

6. And run the refresh function again.

 

 

In my case, I have a bounce, but the refresh does not run, and the function is not called.

 

 

Has anyone solved the same problem as me? Is this a bug?

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