Inject a JavaScript code in Webview iOS

Question

I created a iOS web browser with swift language code. And add an extra button to inject a script on that web page, but it always crash when I try this:

webVi         


        

Answer 1

If you are using WKWebView here is a solution.

if let scriptFile = NSBundle.mainBundle().pathForResource("script", ofType: "js") {
    var error: NSError?
    let scriptString = NSString(contentsOfFile: scriptFile, encoding: NSUTF8StringEncoding, error: &error)
    if let error = error {
        println("Error: Could not load script file => \(error)")
    } else {
        if let scriptString = scriptString {
            let script = WKUserScript(source: scriptString, injectionTime: .AtDocumentEnd, forMainFrameOnly: true)
            let controller = WKUserContentController()
            controller.addUserScript(script)

            let configuration = WKWebViewConfiguration()
            configuration.userContentController = controller

            let webView = WKWebView(frame: self.view.bounds, configuration: configuration)
            self.webView = webView
            self.view.addSubview(webView)
        }
    }
}