如何在颤动中改变IconButton的颜色

import 'package:flutter/material.dart';

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

class _MyWidgetState extends State<MyWidget>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<Color> _colorAnimation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(milliseconds: 500),
      vsync: this,
    )..repeat(reverse: true);
    _colorAnimation = ColorTween(
      begin: Colors.blue,
      end: Colors.red,
    ).animate(_controller);
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedContainer(
      duration: const Duration(milliseconds: 500),
      color: _colorAnimation.value,
      child: IconButton(
        icon: Icon(Icons.add),
        onPressed: () {
          // 按钮点击事件
        },
      ),
    );
  }

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