childView.swift

final internal class ChildView: NSObject, View, WKNavigationDelegate, UIViewRepresentable {
      
    var _loginWebView: WKWebView!
    
      
    func webView(_ _webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: (WKNavigationResponsePolicy) -> Void) {
        guard ((navigationResponse.response as? HTTPURLResponse)?.statusCode) != nil else {
            decisionHandler(.allow)
            return
        }
        
        decisionHandler(.allow)
    }
    
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
        
        guard let returnUrl = (webView.url?.absoluteString) else {
            decisionHandler(.cancel)
            return
        }
        
        if (returnUrl.contains("my-identifier") ) {
          
            /* raise event here */ 
        }

        decisionHandler(.allow)
        
    }
    
    func makeUIView(context: Context) -> WKWebView  {
        _loginWebView = WKWebView(frame: .zero)
        _loginWebView.navigationDelegate = self
        
        return _loginWebView
    }
    
    func updateUIView(_ uiView: WKWebView, context: Context) {        
         let request = // build a request...
         _loginWebView.load(request)
               
     }
        
}

parentView.swift

import SwiftUI
import Combine

struct LoginHostView : View {
    @Binding var showView : Bool
    
    var body: some View {
        VStack{
            HStack{
                Button(action: {
                    self.showView = false                    
                }){
                    Text("back")
                }
                Spacer()
            }
            if (self.settings.nowPlaying.isLoggedIn){
                Button(action: {
                    self.showView = false
                }){
                    Text("You are logged in!")
                }
            }
            else {
                LoginView()
            }
        }
    }
}