颤动-在setState之前保存多个小部件变换

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool _isButtonPressed = false;
  Color _buttonColor = Colors.blue;

  void _handleButtonPress() {
    setState(() {
      _isButtonPressed = !_isButtonPressed;
      _buttonColor = _isButtonPressed ? Colors.red : Colors.blue;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Example'),
        ),
        body: Center(
          child: RaisedButton(
            onPressed: _handleButtonPress,
            color: _buttonColor,
            child: Text('Press Me'),
          ),
        ),
      ),
    );
  }
}

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