How to do programmatic navigation in swiftui using navigationstack once state changes?

Question

struct LoginView: View {

    @State var isUserLoggedIn = false
    
    NavigationStack{
          //.....
          Button {
              Task{
                  await viewModel.doLogin(email: email, password: password)
              }
          } label: {
              Text(Constants.LOGIN)
                .foregroundColor(Constants.BACKGROUND_COLOR)
                .font(Font.custom(Constants.FREDOKA_MEDIUM, size: 25))
                .frame(maxWidth: .infinity)
          }
    }.onChange(of: isUserLoggedIn) { isUserLoggedIn in
        debugPrint(newPasswordValue)
    }
}

I am not able to understand how to write NavigationLink if a state changes, there is no push method in navigation stack as well

Answer 1

...to do programmatic navigation in swiftui using navigationstack once state changes..., try this approach using NavigationPath and navigationDestination

struct LoginView: View {
    
    @State var isUserLoggedIn = false
    @State var path = NavigationPath()   // <-- here
    
    var body: some View {
        NavigationStack(path: $path) {   // <-- here
            Button {
                Task {
                    await viewModel.doLogin(email: email, password: password)
                    if isUserLoggedIn {
                        path.append(1)  // <-- here
                    }
                }
            } label: {
                Text("Login")
                    .foregroundColor(Constants.BACKGROUND_COLOR)
                    .font(Font.custom(Constants.FREDOKA_MEDIUM, size: 25))
                    .frame(maxWidth: .infinity)
            }
            .navigationDestination(for: Int.self) { _ in     // <-- here
                NextView()
            }
        }
    }
}

struct NextView: View {
    
    var body: some View {
        Text("NextView")
    }
}