How to call Objective-C from Javascript?

Question

I have a WebView, and I want to call a view in Objective-C from JavaScript. Does someone know how I can do this?

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I have this code in my ViewController:

Answer 1

I had an issue with this approach: I wanted to send several messages to the iphone device, but it seemed that they were "overlaped" as they could not process all of them sequentially.

Example: when executing this code:

window.location = "app://action/foo";
window.location = "app://action/bar";

The action foo was never executed.

What I had to do was the following:

waitingForMessage = false;

function MsgProcessed(){
    waitingForMessage = false;
}

function SyncLaunchURL(url){
    if (waitingForMessage){
        setTimeout(function(){SyncLaunchURL(url)},100);
    }else{
        window.location = url
        waitingForMessage = true;   
    }
}

SyncLaunchURL("app://action/foo");
SyncLaunchURL("app://action/bar");

With this approach, the iphone has to call MsgProcessed() after processing the call. This way works for me, and maybe helps someone with the same problem!