Regarding the issue with CallFromJS in WKWebView! Seeking help.

[jagerrrrr]

Hello, author. I've integrated WKWebView into Unity, and in my web page, I've set up Unity.call(msg). However, my iOS application is not receiving the CallFromJS event. After adding the "ld:" JavaScript definition, I was able to trigger the CallFromJS event, but the msg I received isn't what I expected, it contains some hardware parameters. I noticed a comment stating that WKWebView doesn't need to include the "ld:" definition. So, what should I do? I've been struggling with this for a whole week. I'm sorry，I'm very frustrated.

Log regarding hardware parameter information :

CallFromJS[ua=Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148]

Code related to WebView initialization:

contentObject = new GameObject("ContentObject").AddComponent<WebViewObject>();
        contentObject.Init(
            cb: (msg) =>
            {
                Debug.Log(string.Format("CallFromJS[{0}]", msg));
                OnMsg?.Invoke(msg);
            },
            err: (msg) =>
            {
                Debug.Log(string.Format("CallOnError[{0}]", msg));
            },
            httpErr: (msg) =>
            {
                Debug.Log(string.Format("CallOnHttpError[{0}]", msg));
            },
            started: (msg) =>
            {
                Debug.Log(string.Format("CallOnStarted[{0}]", msg));
            },
            hooked: (msg) =>
            {
                Debug.Log(string.Format("CallOnHooked[{0}]", msg));
            },
            cookies: (msg) =>
            {
                Debug.Log(string.Format("CallOnCookies[{0}]", msg));
            },
            ld: (msg) =>
            {
                Debug.Log(string.Format("CallOnLoaded[{0}]", msg));
#if UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX || UNITY_IOS
                // NOTE: the following js definition is required only for UIWebView; if
                // enabledWKWebView is true and runtime has WKWebView, Unity.call is defined
                // directly by the native plugin.
#if true
                var js = @"
                    if (!(window.webkit && window.webkit.messageHandlers)) {
                        window.Unity = {
                            call: function(msg) {
                                window.location = 'unity:' + msg;
                            }
                        };
                    }
                ";
#else
                // NOTE: depending on the situation, you might prefer this 'iframe' approach.
                // cf. https://github.com/gree/unity-webview/issues/189
                var js = @"
                    if (!(window.webkit && window.webkit.messageHandlers)) {
                        window.Unity = {
                            call: function(msg) {
                                var iframe = document.createElement('IFRAME');
                                iframe.setAttribute('src', 'unity:' + msg);
                                document.documentElement.appendChild(iframe);
                                iframe.parentNode.removeChild(iframe);
                                iframe = null;
                            }
                        };
                    }
                ";
#endif
#elif UNITY_WEBPLAYER || UNITY_WEBGL
                var js = @"
                    window.Unity = {
                        call:function(msg) {
                            parent.unityWebView.sendMessage('contentObject', msg);
                        }
                    };
                ";
#else
                var js = "";
#endif
                contentObject.EvaluateJS(js + @"Unity.call('ua=' + navigator.userAgent)");
            },
            enableWKWebView: true
        );

[KojiNakamaru]

I've put a modified sample which can be directly opened and built with 2020.3.15f2:

https://github.com/gree/unity-webview/tree/example-for-995/sample

You can check how it was changed from the latest master branch:

https://github.com/gree/unity-webview/compare/master...example-for-995

The js definition in the ld: callback is removed as below:

https://github.com/gree/unity-webview/commit/d5c641bc552d598504959c71b3fc55cb8827b321

At the end of the callback, the code still performs the following and this invokes CallFromJS().

                webViewObject.EvaluateJS("Unity.call('ua=' + navigator.userAgent)");

[jagerrrrr]

抱歉，我的意思是我拿到不网站中的js发送事件，关于这点您可以知道一下吗，任何形式的细节都可能帮助我，比如网页端需要如何写Unity.call()，为此需要导入什么库才能正确触发我们的这webview中的cb:事件

[KojiNakamaru]

Please just try https://github.com/gree/unity-webview/tree/example-for-995/sample at first. As noted before, this sample app invokes Unity.call('ua=' + navigator.userAgent) and its message is received by the cb: callback.

[jagerrrrr]

thank you！！！