Question about running a function with parameters in javascript in WkWebView in Swift

Question

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<script>
    function resizeFont(font_index) {
         var arrFontSize = ["80%", "90%", "100%", "110%", "120%"];
         var x = document.getElementsByTagName("SPAN");
         for (var i = 0; i < x.length; i++) {
             x[i].style.fontSize = arrFontSize[font_index];
         }
    }
</script>

The above function is to adjust the font of the page that shows the contents of the book.

override func viewDidLoad() {
        super.viewDidLoad()

        let webConfiguration = WKWebViewConfiguration()
        let contentController = WKUserContentController()

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

        webConfiguration.userContentController = contentController
        webView = WKWebView(frame: self.containerView.frame, configuration: webConfiguration)
        webView.uiDelegate = self
        webView.navigationDelegate = self
        self.view.addSubview(ebView)
    }


extension SearchWVViewController: WKScriptMessageHandler {
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        if let name = message.name as? String, name == "resizeFont" {

            //code
        }
}

The code above executes a function with no parameters to pass. But how do I execute a function while passing a font_index?

AlexSmet · Accepted Answer · 2020-02-27 07:24:22Z

1

If you want to execute JS function for WKWebView just use evaluateJavaScript method e.g.

let fontIndex = 1
webView.evaluateJavaScript("resizeFont(\(fontIndex))")

Use userContentController(:) if you want to receive messages from JS running in a webpage. But in your case, if you want to just execute some JS function in a webpage, you don't need to use WKUserContentController and WKScriptMessageHandler, just use evaluateJavaScript method.

answered Feb 27, 2020 at 7:24

AlexSmet

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