如何从 swift5 中的 WKWebviews 预加载 WKWebviews

Question

我有两个独立的WKWebViewController。当按下按钮时，我加载第一个 WKWebView，然后加载另一个 WKWebView。

所以我想提前加载另一个WKWebView。我该怎么做？

两个 ViewController 中的每一个都有 WKWebView。

第一个 WKWebView

    func openSecondScreen(){
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let openSecondScreen = storyboard.instantiateViewController(withIdentifier: "SecondWebViewController") as! SecondWebViewController
        openSecondScreen.modalPresentationStyle = .overCurrentContext
        openSecondScreen.modalTransitionStyle = .crossDissolve
        openSecondScreen.delegate = self
        self.navigationController?.pushViewController(openSecondScreen, animated: true)
    }

第二个 WKWebView

    @IBOutlet var secondWKWebView: WKWebView!
    override func loadView() {
        super.loadView()

        let images = global.getIndicatorImage()
        let animatedImage = UIImage.animatedImage(with: images, duration: 1.0)
        self.indicatorImage.image = animatedImage


        contentController.add(self, name: "SecondWeb")

        config.userContentController = contentController

        secondWKWebView = WKWebView(frame: secondWKWebView.frame, configuration: config)

        secondWKWebView.uiDelegate = self
        secondWKWebView.navigationDelegate = self

        view.addSubview(secondWKWebView)
        view.addSubview(indicator)

        if contentController.userScripts.count > 0 {
            contentController.removeAllUserScripts()
        }
        let  localFilePath = Bundle.main.url(forResource: webUrl, withExtension: "html")
        let  myRequest = URLRequest(url: localFilePath)
        secondWKWebView.load(myRequest)
    }

我该如何解决这个问题？

Answer 1

我想我找到了解决办法。但是有一个问题。我仍然可以看到指标的动画图像。我认为搜索没有完成。

第一个 WKWebView

    var openSecondScreen : SecondWebViewController!
    var preloadCheck = false
   ...
    func openSecondScreen(){
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        openSecondScreen = storyboard.instantiateViewController(withIdentifier: "SecondWebViewController") as! SecondWebViewController
        openSecondScreen.delegate = self
        openSecondScreen.loadViewIfNeeded()
        openSecondScreen.secondWKWebView.uiDelegate = self
        openSecondScreen.secondWKWebView.navigationDelegate = self
        preloadCheck = true
    }
....
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        if preloadCheck {
            self.navigationController?.pushViewController(openSecondScreen, animated: true)
            preloadCheck = false
        }
    }

第二个 WKWebView

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        indicatorImage.isHidden = true
        indicatorImage.stopAnimating()
    }

所以我通过在显示屏幕时隐藏指示图像来解决问题。

第二个 WKWebView

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        indicatorImage.isHidden = true
        indicatorImage.stopAnimating()
}

当您按下按钮打开secondWebview屏幕时，指示图像显示在firstWebview屏幕上，指示图像 导航完成后消失，secondWebview 屏幕出现 preloaded。

如何从 swift5 中的 WKWebviews 预加载 WKWebviews

How to preload WKWebviews from the WKWebviews in swift5

preload

ios

swift

wkwebview

两个 ViewController 中的每一个都有 WKWebView。

第一个 WKWebView

第二个 WKWebView

第一个 WKWebView

第二个 WKWebView

第二个 WKWebView