Nsryjdtyk

When using default swipe-navigation gesture inside WKWebView, I found if the frame size of WKWebView changed during navigation, the preview doesn't work and will bring a white screen. Does anyone know how to resolve that?

My sample code:

import UIKit

import WebKit



class ViewController: UIViewController {



    private lazy var webView: WKWebView = {

        let view = WKWebView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))

        view.allowsBackForwardNavigationGestures = true

        view.navigationDelegate = self

        return view

    }()



    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        self.view.addSubview(self.webView)



        if let url = URL(string: "http://www.wikipedia.org") {

            self.webView.load(URLRequest(url: url))

        }

    }



}



extension ViewController: WKNavigationDelegate {

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

        webView.frame = CGRect(origin: webView.frame.origin, size: CGSize(width: webView.frame.width, height: webView.frame.height - 20))

    }

}