Flutter：如何在没有插件的情况下制作旋转动画

RotationTransition(   turns: _animation,   child: /* Your widget here */}

// Create a controllerlate final AnimationController _controller = AnimationController(    duration: const Duration(seconds: 2),    vsync: this,)..repeat(reverse: false);​// Create an animation with value of type "double"late final Animation<double> _animation = CurvedAnimation(    parent: _controller,    curve: Curves.linear,);

_controller.stop()

_controller.repeat()

// main.dartimport 'package:flutter/material.dart';​void main() {  runApp(MyApp());}​class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(        // Remove the debug banner        debugShowCheckedModeBanner: false,        title: '坚果前端',        theme: ThemeData(          primarySwatch: Colors.indigo,        ),        home: HomePage());  }}​class HomePage extends StatefulWidget {  const HomePage({Key? key}) : super(key: key);  @override  _HomePageState createState() => _HomePageState();}​class _HomePageState extends State<HomePage> with TickerProviderStateMixin {  // Create a controller  late final AnimationController _controller = AnimationController(    duration: const Duration(seconds: 2),    vsync: this,  )..repeat(reverse: false);​  // Create an animation with value of type "double"  late final Animation<double> _animation = CurvedAnimation(    parent: _controller,    curve: Curves.linear,  );​  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('坚果前端'),      ),      body: Center(        child: RotationTransition(          turns: _animation,          child: Padding(            padding: EdgeInsets.all(8.0),            child: Container(              child: Wrap(                children: [                  Container(                    width: 150,                    height: 150,                    decoration: BoxDecoration(                        color: Colors.amber, shape: BoxShape.circle),                  ),                  Container(                    width: 150,                    height: 150,                    decoration: BoxDecoration(                        color: Colors.green, shape: BoxShape.circle),                  ),                  Container(                    width: 150,                    height: 150,                    decoration: BoxDecoration(                        color: Colors.indigo, shape: BoxShape.circle),                  ),                  Container(                    width: 150,                    height: 150,                    decoration: BoxDecoration(                        color: Colors.red, shape: BoxShape.circle),                  )                ],              ),            ),          ),        ),      ),      // This button is used to toggle the animation      floatingActionButton: FloatingActionButton(        child: Icon(Icons.moving),        onPressed: () {          if (_controller.isAnimating) {            _controller.stop(); // Stop the animation          } else {            _controller.repeat(); // Start the animation          }        },      ),    );  }​  @override  void dispose() {    _controller.dispose();    super.dispose();  }}