Implementing Login Navigation in SwiftUI - swiftui

Question

Here is my requirement: I want to display a login screen, perform authentication via a network request, and if successful, display the content page.
I have implemented the network request part as per the suggestion by jpdnx here.
I have a UserAuth class and the corresponding code to display the Login View if not logged in, and the Content View if logged in, as per M Reza here.
However, I am not able to combine the two - when the network request finishes in LoginView, I am not able to get the flow back to the LoginControllerView to navigate to ContentView. Any help will be appreciate here.
Here is my code:
Network.swift
class ViewModel<T: Codable> : ObservableObject {
//#Published var calendar : IDCCalendar?
#Published var modelData : T?
func getData(url: URL, encoded: String, completion: (#escaping ()->()) ) {
var request = URLRequest(url: url)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
print(encoded)
let encoder = JSONEncoder()
if let data = try? encoder.encode(encoded) {
request.httpBody = data
}
print("Request: \(request)")
URLSession.shared.dataTask(with: request) { data1, response, error in
if let error = error {
print("Request error: ", error)
return
}
guard let data1 = data1 else { return }
DispatchQueue.main.async {
let decoder = JSONDecoder()
print(String(decoding: data1, as: UTF8.self))
if let value = try? decoder.decode(T.self, from: data1)
{
self.modelData = value
completion()
print("Success!")
}
else {
print("Does not decode correctly")
}
}
}.resume()
}
LoginControllerView.swift
var body: some View {
Group {
if !userAuth.isLoggedin {
LoginView(userAuth: userAuth)
} else {
ContentView()
}
}
LoginView.swift
struct LoginView: View {
#EnvironmentObject var userAuth: UserAuth
#StateObject var viewModel = ViewModel<Login>()
var body: some View {
// Login Screen UI here
Button("Login") {
// Commenting out network request code out for now
/*
let url = URL(<URL goes here>)!
let encoded = <JSON String goes here>
let completion = {
if viewModel.modelData?.Status == 0 {
userAuth.isLoggedin = true
let login = viewModel.modelData!
let encoder = JSONEncoder()
if let data = try? encoder.encode(login) {
UserDefaults.standard.set(data, forKey: "LoginData")
}
}
viewModel.getData(url: url, encoded: encoded, completion: completion)
*/
// For test purposes, setting it to true, I want this to percolate back to
// LoginControllerView
userAuth.isLoggedin = true
}
UserAuth.swift
import Combine
class UserAuth: ObservableObject {
let didChange = PassthroughSubject<UserAuth,Never>()
// required to conform to protocol 'ObservableObject'
let willChange = PassthroughSubject<UserAuth,Never>()
func login() {
// login request... on success:
self.isLoggedin = true
}
var isLoggedin = false {
didSet {
didChange.send(self)
}
}
}