Created
March 4, 2021 14:01
-
-
Save JSerZANP/ea300d419bfafa79e4f8c0af42d8fec6 to your computer and use it in GitHub Desktop.
communication between native(swiftUI) and wkwebview
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import SwiftUI | |
| import WebKit | |
| struct WebView: UIViewRepresentable { | |
| class Coordinator: NSObject, WKNavigationDelegate, WKScriptMessageHandler { | |
| var webView: WKWebView? | |
| func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) { | |
| self.webView = webView | |
| } | |
| // receive message from wkwebview | |
| func userContentController( | |
| _ userContentController: WKUserContentController, | |
| didReceive message: WKScriptMessage | |
| ) { | |
| print(message.body) | |
| let date = Date() | |
| DispatchQueue.main.asyncAfter(deadline: .now() + 1) { | |
| self.messageToWebview(msg: "hello, I got your messsage: \(message.body) at \(date)") | |
| } | |
| } | |
| func messageToWebview(msg: String) { | |
| self.webView?.evaluateJavaScript("webkit.messageHandlers.bridge.onMessage('\(msg)')") | |
| } | |
| } | |
| func makeCoordinator() -> Coordinator { | |
| return Coordinator() | |
| } | |
| func makeUIView(context: Context) -> WKWebView { | |
| let coordinator = makeCoordinator() | |
| let userContentController = WKUserContentController() | |
| userContentController.add(coordinator, name: "bridge") | |
| let configuration = WKWebViewConfiguration() | |
| configuration.userContentController = userContentController | |
| let _wkwebview = WKWebView(frame: .zero, configuration: configuration) | |
| _wkwebview.navigationDelegate = coordinator | |
| return _wkwebview | |
| } | |
| func updateUIView(_ webView: WKWebView, context: Context) { | |
| guard let path: String = Bundle.main.path(forResource: "index", ofType: "html") else { return } | |
| let localHTMLUrl = URL(fileURLWithPath: path, isDirectory: false) | |
| webView.loadFileURL(localHTMLUrl, allowingReadAccessTo: localHTMLUrl) | |
| } | |
| } | |
| struct ContentView: View { | |
| var body: some View { | |
| VStack { | |
| Text("hello?") | |
| WebView() | |
| } | |
| } | |
| } | |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1, minimum-scale=1, viewport-fit=cover"> | |
| </head> | |
| <body> | |
| <button>click me</button> | |
| <hr/> | |
| <div id="log"></div> | |
| <script> | |
| const log = (msg) => { | |
| const p = document.createElement('p') | |
| p.textContent = msg | |
| document.querySelector('#log').append(p) | |
| } | |
| // to receive messages from native | |
| webkit.messageHandlers.bridge.onMessage = (msg) => { | |
| log('from native:' + msg) | |
| } | |
| document.querySelector('button').addEventListener('click', () => { | |
| log(typeof webkit.messageHandlers.bridge.postMessage) | |
| // send messages to native | |
| webkit.messageHandlers.bridge.postMessage('{"msg": "hello?","id": ' + Date.now() + '}') | |
| }) | |
| </script> | |
| </body> | |
| </html> | |
func makeCoordinator automatically executed before makeUIView, so there must be
func makeUIView(context: Context) -> WKWebView {
------> let coordinator = context.coordinator <-------
let userContentController = WKUserContentController()
userContentController.add(coordinator, name: "bridge")
.....
return _wkwebview
}
// to receive messages from native
webkit.messageHandlers.bridge.onMessage = (msg) => {
log('from native:' + msg)
}
There is a problem when handling SwiftUI's javascript instructions
First, initialization is good, but then when I update the view I get an error
WKJavaScriptExceptionLineNumber=1, WKJavaScriptExceptionMessage=TypeError: webkit.messageHandlers.bridge.onMessage is not a function.
Finally I used other people's method to solve it
https://stackoverflow.com/a/56325336/12679246
window.onMessage = function(msg) {
// ...
}
Amazing work, very useful!
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Thanks! This helps out a ton