How to get JSContext from WKWebView

Question

In UIWebView, I can get JSContext through:

[webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"]

The same way doesn't work in WKWebView and app crashes when it arrives this line of code.

Is there a way to get JSContext in WKWebView?

thanks in advance.

Answer 1

You cannot obtain the context, because layout and javascript is handled on another process.

Instead, add scripts to your webview configuration, and set your view controller (or another object) as the script message handler.

Now, send messages from JavaScript like so:

window.webkit.messageHandlers.interOp.postMessage(message)

Your script message handler will receive a callback:

- (void)userContentController:(WKUserContentController *)userContentController 
                            didReceiveScriptMessage:(WKScriptMessage *)message{
    NSLog(@"%@", message.body);
}