How do I display WKWebView url? - swiftui

Question

I was wondering how I can display my current URL on WKWebView and display URL on change also. Currently I added a Text() but it does not display the URL at all. Any ideas how I can fix it?
WebView
import SwiftUI
import WebKit
struct WebView : UIViewRepresentable {
let request: URLRequest
private var webView: WKWebView?
init (request: URLRequest) {
self.webView = WKWebView()
self.request = request
}
func makeUIView(context: Context) -> WKWebView {
webView?.load(request)
return webView!
}
func updateUIView(_ uiView: WKWebView, context: Context) {
}
func URL() -> String {
return (webView?.url)?.absoluteString ?? ""
}
func goBack() {
webView?.goBack()
}
func goForward() {
webView?.goForward()
}
}
MainView
struct MainView: View {
var webView: WebView = WebView(request: URLRequest(url: URL(string: "https://www.google.com")!))
var body: some View {
VStack {
//...
Text(webView.URL())
webView
Button(action: { webView.goBack() }, label: { Text("Test") })
//...
}
}

Answer 1

To keep track of the URL of the WKWebView, you'll need to use a WKNavigationDelegate.
You can use a Coordinator in your UIViewRepresentable for the WKNavigationDelegate and an ObservableObject with a #Published value to communicate between the WebView and your parent view:
class NavigationState : ObservableObject {
#Published var url : URL?
}
struct WebView : UIViewRepresentable {
let request: URLRequest
var navigationState : NavigationState
func makeCoordinator() -> Coordinator {
return Coordinator()
}
func makeUIView(context: Context) -> WKWebView {
let webView = WKWebView()
context.coordinator.navigationState = navigationState
webView.navigationDelegate = context.coordinator
webView.load(request)
return webView
}
func updateUIView(_ uiView: WKWebView, context: Context) {
}
class Coordinator : NSObject, WKNavigationDelegate {
var navigationState : NavigationState?
func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
navigationState?.url = webView.url
}
}
}
struct ContentView: View {
#StateObject var navigationState = NavigationState()
var body: some View {
VStack(){
Text(navigationState.url?.absoluteString ?? "(none)")
WebView(request: URLRequest(url: URL(string: "https://www.google.com")!), navigationState: navigationState)
}
}
}
Update, based on comments:
class NavigationState : NSObject, ObservableObject {
#Published var url : URL?
let webView = WKWebView()
}
extension NavigationState : WKNavigationDelegate {
func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
self.url = webView.url
}
}
struct WebView : UIViewRepresentable {
let request: URLRequest
var navigationState : NavigationState
func makeUIView(context: Context) -> WKWebView {
let webView = navigationState.webView
webView.navigationDelegate = navigationState
webView.load(request)
return webView
}
func updateUIView(_ uiView: WKWebView, context: Context) { }
}
struct ContentView: View {
#StateObject var navigationState = NavigationState()
var body: some View {
VStack(){
Text(navigationState.url?.absoluteString ?? "(none)")
WebView(request: URLRequest(url: URL(string: "https://www.google.com")!), navigationState: navigationState)
HStack {
Button("Back") {
navigationState.webView.goBack()
}
Button("Forward") {
navigationState.webView.goForward()
}
}
}
}
}