（Flutter）输入文本框

CODE

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final _textController = TextEditingController();
  String userPosts = "";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Padding(
        padding: const EdgeInsets.all(0.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.end,
          children: [
            Expanded(
              child: Container(
                color: Colors.grey,
                child: Center(
                  child: Text(
                    userPosts,
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 50,
                    ),
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.all(8),
              child: TextField(
                controller: _textController,
                decoration: InputDecoration(
                  hintText: "Enter text",
                  border: OutlineInputBorder(),
                  suffixIcon: IconButton(
                    onPressed: () {
                      _textController.clear();
                    },
                    icon: Icon(Icons.clear),
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.all(8),
              child: MaterialButton(
                color: Colors.blue,
                onPressed: () {
                  setState(
                    () {
                      userPosts = _textController.text;
                    },
                  );
                },
                child: Text(
                  "Submit",
                  style: TextStyle(
                    color: Colors.white,
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

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