How to use WebView in SwiftUI

Issue #736

struct MyWebView: NSViewRepresentable {
    let url: URL
    @Binding
    var isLoading: Bool

    func makeCoordinator() -> Coordinator {
        Coordinator(parent: self)
    }

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

    func updateNSView(_ nsView: WKWebView, context: Context) {

    }

    class Coordinator: NSObject, WKNavigationDelegate {
        let parent: MyWebView

        init(parent: MyWebView) {
            self.parent = parent
        }

        func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
            parent.isLoading = true
        }

        func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
            parent.isLoading = false
        }
    }
}