To use our SDK with Swift , you only need to add the name of message handler as NativeIOS when using the WKWebView. This handler allows our server to communicate with WebViews in Swift. See the example below:

import Foundation
import WebKit
import SwiftUI
struct WebViewContainer: UIViewRepresentable {
    let sdkMobileServer = "https://sdk-mobile.cert.zerohash.com/v1/"
    let zeroHashAppsURL = "https://web-sdk.cert.zerohash.com/"
    var token: String = "<JWT_TOKEN_HERE>"
    var url : URL = URL(string: "\(sdkMobileServer)?achDepositsJWT=\(token)&cryptoBuyJWT=\(token)&cryptoSellJWT=\(token)&cryptoWithdrawalsJWT=\(token)&fiatWithdrawalsJWT=\(token)&userOnboardingJWT=\(token)&zeroHashAppsURL=\(zeroHashAppsURL)")!

    class Coordinator: NSObject, WKNavigationDelegate, WKScriptMessageHandler {
        var webView: WKWebView?
        var token: String
        init(token: String) {
            self.token = token
        func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
            self.webView = webView
        // Handle messages from the WebView
        func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
            guard let jsonString = message.body as? String else {
                print("Unexpected message type:", type(of: message.body))
            do {
                guard let jsonObject = try JSONSerialization.jsonObject(with: Data(jsonString.utf8), options: []) as? [String: Any] else {
                    print("Failed to convert JSON string to a JSON object")
                guard let messageType = jsonObject["type"] as? String else {
                    print("Missing 'type' key in JSON object")
                print("Message type:", messageType)
                if messageType == "SDK_MOBILE_READY" {
                    print("SDK Mobile ready:", messageType)
                // Handle other message types here
                // Your code here...
            } catch {
                print("Error parsing JSON:", error.localizedDescription)

        func sendMessageToWebView(_ event: String) {
            let script = "window.postMessage({type: '\(event)', payload: { appIdentifier: 'crypto-buy'}});"
            print("Sending message to WebView:", event)
            // print("Sending message to WebView:", script)
            webView?.evaluateJavaScript(script, completionHandler: { (result, error) in
                if let error = error {
                    print("Error sending message to WebView:", error.localizedDescription)

    func makeCoordinator() -> Coordinator {
        return Coordinator(onClose: onClose, jwt: jwt, module: module)
    func makeUIView(context: Context) -> WKWebView {
        let coordinator = makeCoordinator()
        let userContentController = WKUserContentController()
        // Add a script message handler for the 'NativeIOS' message name
        // IMPORTANT: do not change the message name 'NativeIOS' as it is used by the SDK to communicate with the native app
        userContentController.add(coordinator, name: "NativeIOS")
        let configuration = WKWebViewConfiguration()
        configuration.userContentController = userContentController
        let _wkwebview = WKWebView(frame: .zero, configuration: configuration)
        _wkwebview.navigationDelegate = coordinator
        _wkwebview.load(URLRequest(url: url))
        return _wkwebview