Can I run JavaScript inside Swift code?

Question

I need to include JavaScript code in Swift code to be able to call a signalR chat, is that possible? If not, can I convert it?

sendmessage is a button.

$(function () {
    // Declare a proxy to reference the hub.
    var chat = $.connection.chatHub;
    // Create a function that the hub can call to broadcast messages.
    chat.client.broadcastMessage = function (name, message) {
        // some code
    };

    // Start the connection.
    $.connection.hub.start().done(function () {
        $('#sendmessage').click(function () {
            // Call the Send method on the hub.
            chat.server.send('name', 'message');
        });
    });
});

and the signalr code is:

    public void Send(string name, string message)
    {
        // Call the broadcastMessage method to update clients. 
        Clients.All.broadcastMessage(name, message);
    }

Update #1:

changed question a little bit so it is not confusing per @MartinR

Answer 1

Last tested with Swift 5.1

Here is an example you can run in Playground to get you started:

import JavaScriptCore

let jsSource = "var testFunct = function(message) { return \"Test Message: \" + message;}"

var context = JSContext()
context?.evaluateScript(jsSource)

let testFunction = context?.objectForKeyedSubscript("testFunct")
let result = testFunction?.call(withArguments: ["the message"])

result would be Test Message: the message.

You also can run JavaScript code within a WKWebView calling evaluate​Java​Script(_:​completion​Handler:​).

You can also run JavaScript within a UIWebView by calling string​By​Evaluating​Java​Script(from:​), but note that that method has been deprecated and is marked as iOS 2.0–12.0.