以下是第一个Flutter动画示例代码，来源 flutter.dev
import 'package:flutter/material.dart';
void main(List<String> args) {
runApp(const LogoApp());
}
class LogoApp extends StatefulWidget {
const LogoApp({super.key});
@override
State<LogoApp> createState() => _LogoAppState();
}
class _LogoAppState extends State<LogoApp> with SingleTickerProviderStateMixin {
late AnimationController controller;
late Animation animation;
@override
void initState() {
super.initState();
controller = AnimationController(
vsync: this,
duration: const Duration(
seconds: 3,
),
);
animation = Tween<double>(begin: 0, end: 300).animate(controller)
..addListener(() {
setState(() {});
});
controller.repeat(reverse: true);
}
@override
void dispose() {
controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Center(
child: Container(
margin: const EdgeInsets.symmetric(vertical: 10),
width: animation.value,
height: animation.value,
child: const FlutterLogo(),
),
);
}
}
