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The WebKit frameworks' WebView class has a property to access the current WebScriptObject. I know that you can invoke JS methods using this object, but is there a way to receive asynchronous JS callback notifications?

I want to render something in the WebView and the script has a callback function when it finishes, but how do I get this notification back to my Cocoa app (without polling a var)?

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I think I figured it out myself.

It should be possible by using the JavaScriptCore framework and by creating an JSObjectRef with JSObjectMakeFunctionWithCallback and pass a C callback function to this constructor.

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You need to implement the WebScripting protocol which allows you to vend methods of Cocoa classes as functions in the JavaScript environment in the WebView. Have a read of the docs.

You can also use JavaScriptCore as you outlined.

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