Flutter -如何在单击时切换FlatButton的颜色？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Flutter Button Color Toggle')),
        body: Center(child: ColorToggleButton()),
      ),
    );
  }
}

class ColorToggleButton extends StatefulWidget {
  @override
  _ColorToggleButtonState createState() => _ColorToggleButtonState();
}

class _ColorToggleButtonState extends State<ColorToggleButton> {
  bool _isRed = true;

  void _toggleColor() {
    setState(() {
      _isRed = !_isRed;
    });
  }

  @override
  Widget build(BuildContext context) {
    return FlatButton(
      onPressed: _toggleColor,
      child: Text('Toggle Color'),
      color: _isRed ? Colors.red : Colors.blue,
    );
  }
}

TextButton(
  onPressed: _toggleColor,
  child: Text('Toggle Color'),
  style: TextButton.styleFrom(
    backgroundColor: _isRed ? Colors.red : Colors.blue,
  ),
)