webView

webView.swift

            let userScript = WKUserScript(source: source,
                                          injectionTime: .atDocumentEnd,
                                          forMainFrameOnly: true)

            let userContentController = WKUserContentController()
            userContentController.addUserScript(userScript)

            let configuration = WKWebViewConfiguration()
            configuration.userContentController = userContentController

            let webView = WKWebView(frame: .zero,
                                    configuration: configuration)
            webView.isOpaque = false
            webView.backgroundColor = .clear
            return webView