Flutter學習-animatedswitcher

 import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {



    final List<String> url=[
      'https://image.cache.storm.mg/styles/smg-800x533-fp/s3/media/image/2020/11/07/20201107-092915_U13380_M651499_4ac4.jpg?itok=6KFZde7p',
      'https://image.cache.storm.mg/styles/smg-800xauto-er/s3/media/image/2020/11/07/20201107-094228_U13380_M651516_e4e5.jpg?itok=57-MTiE5'
    ];

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            AnimatedSwitcher(
              duration: const Duration(seconds: 2),
              //switchInCurve: Curves.bounceIn,
              //switchOutCurve: Curves.bounceInOut,
              transitionBuilder: (child, animation) {
                return RotationTransition(
                  turns: animation,
                  child: child,
                );
              },child: Image.network(url[(_counter%2).toInt()],key: UniqueKey(),),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}