小编Jon*_*els的帖子

我想将文本 Update BlocBuilder 嵌套在另一个 BlocBuilder 中，该 BlocBuilder 通过滑块小部件控制其字体大小。但是，我无法让它工作。请帮忙！

BlocBuilder<SettingsBloc, SettingsState>(
            builder: (context, state) {
       return BlocBuilder<TextFieldBloc, TextFieldState>(
        builder: (context, state) {
          if (state is TextFieldInitState) {
            return Text(
                state.text.toString(),
              style: TextStyle(
                fontSize: state.fontSize,
                fontFamily: 'EthiopicWookianos',
                fontWeight: FontWeight.normal,
                color: Colors.blueGrey,
              ),
            );
          } else if (state is TextFieldLaterState) {
            return Text(
              state.text.toString(),
              style: TextStyle(
                fontSize: state.fontSize,
                fontFamily: 'EthiopicWookianos',
                fontWeight: FontWeight.normal,
                color: Colors.blueGrey,
              ),
            );
          } else {
            return Text("something wrong");
          }
});
}),

这是 TextField Bloc 的代码...（当然它们在单独的文件中）。

import 'package:flutter/widgets.dart';

abstract class …