在Streambuilder中使用TextField

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  final StreamController<String> _streamController = StreamController<String>();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('StreamBuilder with TextField'),
        ),
        body: Center(
          child: StreamBuilder<String>(
            stream: _streamController.stream,
            builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
              if (snapshot.hasData) {
                return Text('Input: ${snapshot.data}');
              } else {
                return TextField(
                  controller: TextEditingController(),
                  onChanged: (String value) {
                    _streamController.add(value);
                  },
                );
              }
            },
          ),
        ),
      ),
    );
  }
}