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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Error: An unimplemented method has been called","articleBody":"Hello, is it possible to return String value from Swift to JS? \r\nFor example, I would like to do something like this:\r\n\r\n```\r\n@objc protocol JavaScriptInterface {\r\n    func someFunc() -\u003e String\r\n}\r\n```\r\n\r\n```\r\nextension ViewController: JavaScriptInterface {\r\nfunc someFunc() -\u003e String {\r\n        return \"alert('close.')\" //so alert would be presented in webView when this method is called.\r\n    }\r\n}\r\n```\r\n\r\nor\r\n\r\n```\r\nextension ViewController: JavaScriptInterface {\r\nfunc someFunc() -\u003e String {\r\n        return \"Something\" //return some string to JS and let it handle it.\r\n    }\r\n}\r\n```\r\n\r\nIn JS, I am calling it like this, for example when button is tapped:\r\n`return iosListener.someFunc();` //iosListener is a name of userContentController\r\n\r\nThis is how I implement webView:\r\nwebView = WKWebView(frame: view.bounds, configuration: setupWebViewConfiguration())\r\n        webView.navigationDelegate = self\r\n        webView.uiDelegate = self\r\n        \r\n        let javaScriptController = WKJavaScriptController(name: \"iosListener\", target: self, bridgeProtocol: JavaScriptInterface.self)\r\n        webView.javaScriptController = javaScriptController\r\n        webView.prepareForJavaScriptController()\r\n        \r\n        view.addSubview(webView)\r\n        \r\n        //then load the url\r\n\r\nI am getting this error: `[WKJavaScriptController] An unimplemented method has been called. (selector: someFunc)`\r\nAlso worth mentioning, my script where I call this method is being called by evaluateJavascript(), when url is loaded. I am not using WKUserScript. My JS is on the web, and I am using evaluateJavascript() to return Swift method.\r\n","author":{"url":"https://github.com/qsd-faris","@type":"Person","name":"qsd-faris"},"datePublished":"2024-01-22T14:51:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/13/WKJavaScriptController/issues/13"}