Controlling the focus on textfields

FocusView.swift

struct FocusView: View {
    enum FocusField {
        case username, password
    }
    
    @State private var username = ""
    @State private var password = ""
    @FocusState private var focusedField: FocusField?
    
    var body: some View {
        Form {
            TextField("Username", text: $username)
                .focused($focusedField, equals: .username)
                .task {
                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { //this hack might be needed if the focus does not work on appear
                        focusedField = .username
                    }
                }
            TextField("Password", text: $password)
                .focused($focusedField, equals: .password)
        }
        .onSubmit {
            switch focusedField {
            case .username:
                focusedField = .password
            case .password:
                focusedField = .username
            default:
                break
            }
        }
    }
}