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Send messages from JavaScript and Handle them on the native side

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Messages can be sent from JavaScript using the following code 

window.webkit.messageHandlers.{NAME}.postMessage()

Here how to create a script message handler to handle the messages: 

class NotificationScriptMessageHandler: NSObject, WKScriptMessageHandler {
    func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage!) {
        if message.name == "{NAME}" {
            // to be sure of handling the correct message
            print(message.body)
        }
    }
}

Here how to configure the script message handler in the WKWebView: 

let configuration = WKWebViewConfiguration()
let userContentController = WKUserContentController()
let handler = NotificationScriptMessageHandler()
userContentController.addScriptMessageHandler(handler, name: "{NAME}")
configuration.userContentController = userContentController 
let webView = WKWebView(frame: self.view.bounds, configuration: configuration)
NOTE: adding same "{NAME}" handler with addScriptMessageHandler:name: more than once, results in NSInvalidArgumentExceptionexception.
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WKWebView:
* WKWebView
* Creating a Simple WebBrowser
* Adding custom user script loaded from app bundle
* Send messages from JavaScript and Handle them on the native side
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