together_mobile/lib/screens/signin_signup/signin_screen.dart

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

import 'package:together_mobile/common/constants.dart';
import 'components/email_signin.dart';
import 'components/username_signin.dart';

class SigninScreen extends StatefulWidget {
  const SigninScreen({super.key});

  @override
  State<SigninScreen> createState() => _SigninScreenState();
}

class _SigninScreenState extends State<SigninScreen> {
  String _method = 'username';

  void chageSigninMethod() {
    if (_method == 'username') {
      _method = 'email';
    } else {
      _method = 'username';
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: const Icon(Icons.arrow_back),
          onPressed: () => context.pop(),
        ),
        title: _method == 'username'
            ? const Text(
                '用户名登录',
              )
            : const Text('邮箱登录'),
        centerTitle: true,
        actions: [
          TextButton(
            onPressed: () {
              setState(() {
                chageSigninMethod();
              });
            },
            style: TextButton.styleFrom(foregroundColor: kContentColorDark),
            child: Text(
              _method == 'username' ? '邮箱登录' : '用户名登录',
              style: const TextStyle(color: kContentColorDark),
            ),
          ),
        ],
      ),
      body: _method == 'username'
          ? const UsernameSigninBody()
          : const EmailSigninBody(),
    );
  }
}