LoginScreen.swift

import SwiftUI

struct LoginScreen: View {
    
    @ObservedObject var viewModel: LoginViewModel = LoginViewModel()
    
    var body: some View {
        VStack {
            
            Spacer()
            
            VStack {
                TextField(
                    "Login.UsernameField.Title".localized,
                    text: $viewModel.username
                )
                .autocapitalization(.none)
                .disableAutocorrection(true)
                .padding(.top, 20)
                
                Divider()
                
                SecureField(
                    "Login.PasswordField.Title".localized,
                    text: $viewModel.password
                )
                .padding(.top, 20)
                
                Divider()
            }
            
            Spacer()
            
            if viewModel.error != nil { // Added this
                Text("Login error")
                    .fontWeight(.bold)
                    .foregroundColor(.red)
            }
            
            Spacer()
            
            Button(
                action: viewModel.login,
                label: {
                    Text("Login.LoginButton.Title".localized)
                        .modifier(MainButton())
                }
            )
        }
        .padding(30)
    }
}

struct LoginScreen_Previews: PreviewProvider {
    static var previews: some View {
        LoginScreen()
    }
}