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我正在Streambuilder使用BLoC. 场景是我在我的登录屏幕中，我单击了电子邮件字段并输入了我的电子邮件。我通过单击该字段继续输入密码并输入我的密码。

情况1：如果我在填写完所有字段后立即按下登录按钮而不关闭键盘，则值被存储并继续登录。

案例 2：我在填​​写完字段后关闭键盘，然后它没有继续登录而是显示错误

The following ValueStreamError was thrown while handling a gesture:
ValueStream has no value. You should check ValueStream.hasValue before accessing ValueStream.value,
or use ValueStream.valueOrNull instead.



Widget loginButton(Orientation orientation) {
    return Container(
      margin: EdgeInsets.symmetric(
          horizontal: orientation == Orientation.landscape
              ? SizeConfig.widthMultiplier * 3.5
              : 0),
      padding: EdgeInsets.symmetric(horizontal: SizeConfig.widthMultiplier * 5),
      child: StreamBuilder<Object>(
          stream: loginBloc.loginCheck,
          builder: (context, snapshot) {
            return ElevatedButton(
              onPressed: () =>
                  snapshot.hasData ? loginBloc.submit() : _showToast(context),
              child: Text(
                StringUtil.loginButton,
                style: textDefaultStyle(
                    colorWhite, FontStyle.normal, FontWeight.w600),
              ),
              style: ElevatedButton.styleFrom(
                  primary: colorPrimary,
                  fixedSize:
                      Size(MediaQuery.of(context).size.width, buttonHeight),
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(50))),
            );
          }),
    );
  }

class LoginBloc extends Object with Validators {
  final _emailController = BehaviorSubject<String>();
  final _passwordController = BehaviorSubject<String>();
  final BuildContext context;

  LoginBloc({required this.context});

  Function(String) get emailChanged => _emailController.sink.add;
  Function(String) get passwordChanged => _passwordController.sink.add;

  Stream<String> get email => _emailController.stream.transform(emailValidator);
  Stream<String> get password =>
      _passwordController.stream.transform(passwordValidator);

  Stream<bool> get loginCheck =>
      Rx.combineLatest2(email, password, (e, p) => true);

  submit() {
    APIService.userLogin(
        context, _emailController.value, _passwordController.value);
  }



  void dispose() {
    _emailController.close();
    _passwordController.close();
  }
}
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