WebView.swift

import Swifter
import SwiftUI
import WebKit

struct WebView: UIViewRepresentable {

    class NavigationDelegate: NSObject, WKNavigationDelegate {

        /// Handle a failed navigation.
        func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
            print("ERROR:", error)
        }

        /// Handle a successful navigation (a response was received).
        func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
            print("RESPONSE:", navigationResponse)

            decisionHandler(.allow) // allow everything
        }
    }

    /// Need to keep a reference to the delegate outside the WebView so it doesn't get deallocated.
    let navigationDelegate: NavigationDelegate
    let request: URLRequest
    var server: HttpServer
    
    init() {
        self.navigationDelegate = NavigationDelegate()
        self.request = URLRequest(url: URL(string: "http://0.0.0.0:8086/testing.html")!)
        
        /// Setup a server which just provides files. The files will be read
        /// from the computer's file system so this won't work if you're
        /// running in on an iOS device.
        self.server = HttpServer()
        self.server["/:path"] = shareFilesFromDirectory("/full/path/to/directory")
        
        do {
            try self.server.start(8086, forceIPv4: true)
            print("Server started on port \(try self.server.port())")
        } catch {
            print("Server start error: \(error)")
        }
    }

    func makeUIView(context: UIViewRepresentableContext<WebView>) -> WKWebView {
        let webView = WKWebView()
        webView.navigationDelegate = navigationDelegate

        return webView
    }
    
    func updateUIView(_ uiView: WKWebView, context: UIViewRepresentableContext<WebView>) {
        uiView.load(request)
    }
}

struct WebView_Previews: PreviewProvider {
    static var previews: some View {
        WebView()
    }
}