import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget {
     @override   Widget build(BuildContext context) {
       return MaterialApp(       home: HomePage(),     );   } } class HomePage extends StatefulWidget {
     @override   _HomePageState createState() => _HomePageState(); } class _HomePageState extends State
    
      with TickerProviderStateMixin {
     AnimationController animationController;   Animation animation;   Animation animationColor;   CurvedAnimation curve;   @override   void initState() {
       // TODO: implement initState     animationController = AnimationController(       vsync: this,       //value: 32.0,       //lowerBound: 0.0,       //upperBound: 200.0,       duration: Duration(milliseconds: 5000),     );     curve = CurvedAnimation(parent: animationController, curve: Curves.easeInOut);     animation = Tween(begin: 32.0, end: 360.0,).animate(curve);     animationColor = ColorTween(begin: Colors.red, end: Colors.green,).animate(curve);     animationController.addListener(() {
         print(animationController.value);       setState(() {});     });     animationController.addStatusListener((AnimationStatus status){print(status);});     super.initState();   }   @override   void dispose() {
       // TODO: implement dispose     animationController.dispose();     super.dispose();   }   @override   Widget build(BuildContext context) {
       return Scaffold(       appBar: AppBar(         title: Text(''),       ),       body: Column(         mainAxisAlignment: MainAxisAlignment.center,         crossAxisAlignment: CrossAxisAlignment.center,         children: 
     
      [           IconButton(               icon: Icon(Icons.favorite),               color: animationColor.value,               iconSize: animation.value,               onPressed: () {
                   animationController.forward();                 switch(animationController.status){
                     case AnimationStatus.completed:                     animationController.reverse();                     break;                   default:                     animationController.forward();                 }               }),           SizedBox(height: 57,),           RaisedButton(             child: Icon(Icons.enhanced_encryption),             onPressed: (){animationController.reverse();},           ),         ],       ),     );   } }