Using WebKit Delegates

Your UIViewRepresentable has an associated class type called Coordinator which is used to set up these relationships. You need to implement makeCoordinator() in your WebView implementation to return an instance of your own class, and then set that class as the WKWebView's delegate.

Here's a quick example:

import SwiftUI
import WebKit

struct WebView: UIViewRepresentable {
    @Binding var title: String
    var url: URL
    var loadStatusChanged: ((Bool, Error?) -> Void)? = nil

    func makeCoordinator() -> WebView.Coordinator {
        Coordinator(self)
    }

    func makeUIView(context: Context) -> WKWebView {
        let view = WKWebView()
        view.navigationDelegate = context.coordinator
        view.load(URLRequest(url: url))
        return view
    }

    func updateUIView(_ uiView: WKWebView, context: Context) {
        // you can access environment via context.environment here
        // Note that this method will be called A LOT
    }

    func onLoadStatusChanged(perform: ((Bool, Error?) -> Void)?) -> some View {
        var copy = self
        copy.loadStatusChanged = perform
        return copy
    }

    class Coordinator: NSObject, WKNavigationDelegate {
        let parent: WebView

        init(_ parent: WebView) {
            self.parent = parent
        }

        func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
            parent.loadStatusChanged?(true, nil)
        }

        func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
            parent.title = webView.title ?? ""
            parent.loadStatusChanged?(false, nil)
        }

        func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
            parent.loadStatusChanged?(false, error)
        }
    }
}

struct Display: View {
    @State var title: String = ""
    @State var error: Error? = nil

    var body: some View {
        NavigationView {
            WebView(title: $title, url: URL(string: "https://www.apple.com/")!)
                .onLoadStatusChanged { loading, error in
                    if loading {
                        print("Loading started")
                        self.title = "Loading…"
                    }
                    else {
                        print("Done loading.")
                        if let error = error {
                            self.error = error
                            if self.title.isEmpty {
                                self.title = "Error"
                            }
                        }
                        else if self.title.isEmpty {
                            self.title = "Some Place"
                        }
                    }
            }
            .navigationBarTitle(title)
        }
    }
}

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

Thanks!

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        view.allowsBackForwardNavigationGestures = true

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        .toolbar {
            ToolbarItemGroup(placement: .navigation) {
                Button(action: {
                    // action to navigate back here
                }) {
                    Image(systemName: "chevron.left")
                }
                Button(action: {
                    // action to navigate forward here
                }) {
                    Image(systemName: "chevron.right")
                }
            }
        }