如何在flutter中动态改变文本？

import 'package:flutter/material.dart';

class DynamicText extends StatefulWidget {
  @override
  _DynamicTextState createState() => _DynamicTextState();
}

class _DynamicTextState extends State<DynamicText> {
  String text = 'Hello World';

  void changeText() {
    setState(() {
      text = 'Flutter is awesome!';
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Dynamic Text'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              text,
              style: TextStyle(fontSize: 24),
            ),
            RaisedButton(
              child: Text('Change Text'),
              onPressed: changeText,
            ),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: DynamicText(),
  ));
}