Xamarin IOS 无法在 JavascriptCore 中绑定函数或回调

Question

按照此处的示例：JSContext

我收到以下异常：

{TypeError: myCSharpObject.myFunc is not a function. (In 'myCSharpObject.myFunc()', 'myCSharpObject.myFunc' is undefined)}

我的代码如下：

        JSContext _context;
        _context = new JSContext();

        var jsCallback = new MyJSExporter();

        _context[(NSString)"myCSharpObject"] = JSValue.From(jsCallback, _context);

        var result = _context.EvaluateScript("myCSharpObject.myFunc();");

协议定义为：

[Protocol]
    interface IMyJSVisibleProtocol : IJSExport
    {
        [Export("myFunc")]
        int MyFunc();

        [Export("Arity2:With:")]
        NSObject Arity2With(NSObject arg1, NSObject arg2);
    }

    class MyJSExporter : NSObject, IMyJSVisibleProtocol
    {
        public int MyFunc()
        {
            Console.WriteLine("Called!");
            return 42;
        }

        public NSObject Arity2With(NSObject arg1, NSObject arg2)
        {
            Console.WriteLine("Arity 2 function called with " + arg1 + " " + arg2);
            return (NSNumber)42;
        }
    }

异常处理程序为：

       _context.ExceptionHandler = (context, exception) => {
            // {TypeError: myCSharpObject.myFunc is not a function. (In 'myCSharpObject.myFunc()', 'myCSharpObject.myFunc' is undefined)}
        };

Answer 1

您使用了错误的 JSContext。在您的代码中，您正在初始化新的 JSContext。相反，您想从文档中获取您在 webView 中加载的内容：var context = (JSContext)webView.ValueForKeyPath((NSString)"documentView.webView.mainFrame.javaScriptContext");

Here is fully working test view controller!

Answer 2

最终为我解决这个问题的是添加构建 mtouch 参数：

'--注册商:static'

Xamarin IOS 无法在 JavascriptCore 中绑定函数或回调

Xamarin IOS Cant Bind function or callback In JavascriptCore

c#

ios

.net

xamarin

javascriptcore