在颤动中，setState不会改变floatingActionButton中的状态

import 'package:flutter/material.dart';

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

class _MyWidgetState extends State<MyWidget> with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<double> _animation;

  bool _isButtonEnabled = true;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: Duration(milliseconds: 500),
      vsync: this,
    );
    _animation = Tween<double>(begin: 0.0, end: 1.0).animate(_controller);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  void _handleButtonPress() {
    setState(() {
      _isButtonEnabled = false;
    });

    _controller.forward().then((_) {
      setState(() {
        _isButtonEnabled = true;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('My Widget')),
      body: Center(
        child: Text('Content'),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _isButtonEnabled ? _handleButtonPress : null,
        child: ScaleTransition(
          scale: _animation,
          child: Icon(Icons.favorite),
        ),
      ),
    );
  }
}