rotating animation

下面是一个示例，直接拷贝到main.dart运行即可，inkwell那部分的ontap可以不要的！这个旋转动画的最关键代码就是：  ..repeat()    注意：两个点哦！

参考视频：https://www.bilibili.com/video/av55835996?from=search&seid=17612587344903857505

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;
  double pi = 3.14;
  @override
  void initState() {
    // TODO: implement initState
    animationController = AnimationController(
      vsync: this,
//      value: 32.0,
//      lowerBound: 0.0,
//      upperBound: 200.0,
      duration: Duration(milliseconds: 500),
    )..repeat();
//    curve = CurvedAnimation(parent: animationController, curve: Curves.easeInOutCirc);
    animation = Tween(begin: 0, end: 2*pi,).animate(animationController);
//    animationColor = ColorTween(begin: Colors.red, end: Colors.green,).animate(curve);
    animationController.addStatusListener((AnimationStatus status){print(status);});
    super.initState();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(''),),
      body:AnimatedBuilder(
          animation: animation,
          builder: (context,child){
            return Transform.rotate(angle: animation.value,child: InkWell(
              child: Center(
                child: Container(
                  width: 100.0,
                  height: 100.0,
                  color: Colors.red,
                ),
              ),
                onTap: () {
                  animationController.forward();
                  switch(animationController.status){
                    case AnimationStatus.completed:
                      animationController.reverse();
                      break;
                    default:
                      animationController.forward();
                  }
                }
            ),);
          }),

    );
  }
}