iOS message handler

2min
LiSA supports safe two-way communication between iOS WKWebView and the LiSA viewer app.
Receive messages from LiSA
LiSA exposes a MessageHandler named MessageFromLiSA. Using this message handler, iOS WKWebView can receive messages from LiSA as described in the Window postMessage API﻿ article.
Send messages to LiSA
To send messages to the LiSA WebView, native JavaScript window object method postMessage must be invoked via JavaScript injection, passing the desired payload.
Example
Swift
import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate {

    var webView: WKWebView!

    override func viewDidLoad() {
        // ... assuming the `webView` is setup here
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        webView.evaluateJavaScript(
            """
            window.postMessage({ \
                recipient: 'LiSA', \
                sender: 'Someone', \
                target: 'app', \
                action: 'resume' \
            }, '*');""",
            completionHandler: nil
        )
    }
}
import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate {

    var webView: WKWebView!

    override func viewDidLoad() {
        // ... assuming the `webView` is setup here
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        webView.evaluateJavaScript(
            """
            window.postMessage({ \
                recipient: 'LiSA', \
                sender: 'Someone', \
                target: 'app', \
                action: 'resume' \
            }, '*');""",
            completionHandler: nil
        )
    }
}
﻿
﻿
Updated 25 Mar 2024
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