animation

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<HomePage> 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: <Widget>[
          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();},
          ),
        ],
      ),
    );
  }
}