TexteEditingController始終為空

我嘗試從 Firebase 實作電子郵件/密碼身份驗證，但 emailController 和 passwordController 在我的 SubmitButton （或我的 TestButton）中什么也沒發送

class LoginScreen extends StatefulWidget {
  LoginScreen({super.key});

  @override
  State<LoginScreen> createState() => LoginScreenState();
}

class LoginScreenState extends State<LoginScreen> {
  final TextEditingController emailController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();

  @override
  void dispose() {
    // Clean up the controller when the widget is disposed.
    emailController.dispose();
    passwordController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        padding: const EdgeInsets.all(30),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            LoginEmail(emailController: emailController),
            const SizedBox(height: 30.0),
            LoginPassword(passwordController: passwordController),
            const SizedBox(height: 30.0),
            SubmitButton(
              email: emailController.text.trim(),
              password: passwordController.text.trim(),
            ),
            TestButton(
              textTest: emailController.text.trim(),
            ),
            Flexible(
              child: LoginButton(
                text: 'Se connecter avec Google',
                icon: FontAwesomeIcons.google,
                color: Colors.blue,
                loginMethod: AuthService().googleLogin,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

登錄郵箱

class LoginEmail extends StatelessWidget {
  LoginEmail({
    Key? key,
    required this.emailController,
  }) : super(key: key);

  final TextEditingController emailController;

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: MediaQuery.of(context).size.width / 2,
      child: TextField(
        controller: emailController,
        decoration: const InputDecoration(hintText: 'Email'),
      ),
    );
  }
}

登錄密碼

class LoginPassword extends StatelessWidget {
  LoginPassword({
    Key? key,
    required this.passwordController,
  }) : super(key: key);

  final TextEditingController passwordController;

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: MediaQuery.of(context).size.width / 2,
      child: TextField(
        controller: passwordController,
        obscureText: true,
        decoration: const InputDecoration(
          hintText: 'Password',
        ),
      ),
    );
  }
}

SubmitButton - $email 和 $password 什么都不列印

class SubmitButton extends StatelessWidget {
  SubmitButton({
    Key? key,
    required this.email,
    required this.password,
  }) : super(key: key);

  final email;
  final password;
  final AuthService authService = AuthService();
  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () async {
        try {
          print('onPress email = $email et password = $password');
          await authService.signInWithEmailAndPassword(
            email: 'myEmail',
            password: 'myPw',
          );
          Navigator.of(context).pushReplacement(
              MaterialPageRoute(builder: (context) => HomeScreen()));
        } catch (e) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Text(e.toString()),
            ),
          );
        }
      },
      child: const Text('Se connecter'),
    );
  }
}

TestButton - $textTest 不列印任何內容

class TestButton extends StatelessWidget {
  TestButton({
    Key? key,
    required this.textTest,
  }) : super(key: key);

  final textTest;

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () async {
        try {
          print('onPress email = $textTest');
        } catch (e) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(
              content: Text(e.toString()),
            ),
          );
        }
      },
      child: const Text('Test'),
    );
  }
}

我期待將 emailController.text 和 passwordControlle.text 的值傳遞給 SubmitButton。

uj5u.com熱心網友回復：

當小部件構建時，它從控制器獲取字串。的初始文本是空的TextEditingController，并且在 上得到空文本TestButton。您可以傳遞控制器實體本身，它將通過參考傳遞。

它會像

class TestButton extends StatelessWidget {
  const TestButton({
    Key? key,
    required this.textTest,
  }) : super(key: key);

  final TextEditingController textTest;

并通過 TextEditingController

 TestButton( textTest: emailController,),

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