[英]Hero Animation Not Working in Flutter
所以,我正在尝试为一家扑朔迷离的餐厅制作送货上门应用程序,但我似乎无法让我的英雄动画正常工作。 首先,我制作了一个显示徽标的启动画面,然后导航到徽标应该进行英雄转换的主页。 启动画面和主页位于两个单独的 dart 文件中。 这是我的启动画面的代码:
import 'package:flutter/material.dart';
import 'home_page.dart';
import 'dart:async';
class Splash extends StatefulWidget {
@override
_SplashState createState() => new _SplashState();
}
class _SplashState extends State<Splash> with SingleTickerProviderStateMixin
{
Animation<double> _mainLogoAnimation;
AnimationController _mainLogoAnimationController;
@override
void initState() {
super.initState();
goToHomePage();
_mainLogoAnimationController = new AnimationController(duration: new Duration(milliseconds: 2500) ,vsync: this);
_mainLogoAnimation = new CurvedAnimation(parent:
_mainLogoAnimationController, curve: Curves.easeIn);
_mainLogoAnimation.addListener(() => (this.setState(() {})));
_mainLogoAnimationController.forward();
}
Future goToHomePage() async {
await new Future.delayed(const Duration(milliseconds: 4000));
Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new HomePage()));
}
@override
Widget build(BuildContext context) {
return new Material(
color: Colors.black,
child: new Center(
child: new Opacity(
opacity: 1.0 * _mainLogoAnimation.value,
child: new Hero(
tag: 'tbh_logo',
child: new Image(
image: new AssetImage('assets/images/tbh_main_logo.png'),
width: 300.0
)
)
)
)
);
}
}
这是主页的代码:
import 'package:flutter/material.dart';
import '../ui/drawer.dart';
import 'splash.dart';
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => new _HomePageState();
}
class _HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("The Barni House"),
backgroundColor: Colors.black,
),
drawer: new Drawer(child: MyDrawer()),
body: new Center(
child: Column(
children: <Widget>[
new Container(
child: new Hero(
tag: 'tbh_logo',
child: new Image(
image: new AssetImage('assets/images/tbh_main_logo.png'),
width: 300.0
)
)
)
],
)
),
);
}
}
检查你的代码,所以英雄动画正在工作,但由于过渡持续时间只有 300 毫秒,它发生得很快。
要实现以下结果,您可以创建自定义 MaterialPageRoute 。
前
@override
Duration get transitionDuration => const Duration(milliseconds: 300);
后
@override
Duration get transitionDuration => const Duration(milliseconds: 1000);
此外,您还可以使用CurvedAnimation
new CurvedAnimation(
parent: routeAnimation,
curve: Curves.elasticIn,
)
自定义路由.dart
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
final Tween<Offset> _kBottomUpTween = new Tween<Offset>(
begin: const Offset(0.0, 1.0),
end: Offset.zero,
);
// Offset from offscreen to the right to fully on screen.
final Tween<Offset> _kRightMiddleTween = new Tween<Offset>(
begin: const Offset(1.0, 0.0),
end: Offset.zero,
);
// Offset from offscreen below to fully on screen.
class AppPageRoute extends MaterialPageRoute<String> {
@override
final bool maintainState;
@override
final WidgetBuilder builder;
CupertinoPageRoute<String> _internalCupertinoPageRoute;
AppPageRoute({
@required this.builder,
RouteSettings settings: const RouteSettings(),
this.maintainState: true,
bool fullscreenDialog: false,
}) : assert(builder != null),
assert(settings != null),
assert(maintainState != null),
assert(fullscreenDialog != null),
super(
settings: settings,
fullscreenDialog: fullscreenDialog,
builder: builder,
) {
assert(opaque); // PageRoute makes it return true.
}
@override
Color get barrierColor => null;
@override
Duration get transitionDuration => const Duration(milliseconds: 1000);
CupertinoPageRoute<String> get _cupertinoPageRoute {
assert(_useCupertinoTransitions);
_internalCupertinoPageRoute ??= new CupertinoPageRoute<String>(
builder: builder,
fullscreenDialog: fullscreenDialog,
hostRoute: this,
);
return _internalCupertinoPageRoute;
}
bool get _useCupertinoTransitions {
return _internalCupertinoPageRoute?.popGestureInProgress == true ||
Theme.of(navigator.context).platform == TargetPlatform.iOS;
}
@override
Widget buildPage(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
final Widget result = builder(context);
assert(() {
if (result == null) {
throw new FlutterError('The builder for route "${settings.name}" returned null.\n'
'Route builders must never return null.');
}
return true;
}());
return result;
}
@override
Widget buildTransitions(
BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) {
if (_useCupertinoTransitions) {
return _cupertinoPageRoute.buildTransitions(context, animation, secondaryAnimation, child);
}
return new _CustomPageTransition(routeAnimation: animation, child: child, fullscreenDialog: fullscreenDialog);
}
}
class _CustomPageTransition extends StatelessWidget {
final Animation<Offset> _positionAnimation;
final Widget child;
final bool fullscreenDialog;
_CustomPageTransition({
Key key,
@required Animation<double> routeAnimation,
@required this.child,
@required this.fullscreenDialog,
}) : _positionAnimation = !fullscreenDialog
? _kRightMiddleTween.animate(new CurvedAnimation(
parent: routeAnimation,
curve: Curves.elasticIn,
))
: _kBottomUpTween.animate(new CurvedAnimation(
parent: routeAnimation, // The route's linear 0.0 - 1.0 animation.
curve: Curves.elasticIn,
)),
super(key: key);
@override
Widget build(BuildContext context) {
return new SlideTransition(
position: _positionAnimation,
child: child,
);
}
}
推送新路由
Future goToHomePage() async {
await new Future.delayed(const Duration(milliseconds: 4000));
Navigator.of(context).push(new AppPageRoute(builder: (BuildContext context) => new HomePage()));
}
您可以将自定义 MaterialPageRoute 用于初始屏幕和其他路由 MaterialPageRoute。
希望能帮助到你
// main.dart class
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart' show timeDilation;
import 'package:flutter_test7/photo_hero.dart';
import 'package:flutter_test7/second_page.dart';
class HeroAnimation extends StatelessWidget {
Widget build(BuildContext context) {
timeDilation = 2.5; // 1.0 means normal animation speed.
return new Scaffold(
appBar: new AppBar(
title: const Text('Basic Hero Animation'),
),
body: new Center(
child: new PhotoHero(
photo: 'images/flippers-alpha.png',
width: 300.0,
onTap: () {
Navigator.of(context).pushNamed('/second_page');
},
),
),
);
}
}
void main() {
runApp(
new MaterialApp(
home: new HeroAnimation(),
routes: <String, WidgetBuilder>{
'/second_page': (context) => new SecondPage()
},
),
);
}
// photo_hero.dart class
import 'package:flutter/material.dart';
class PhotoHero extends StatelessWidget {
const PhotoHero({Key key, this.photo, this.onTap, this.width})
: super(key: key);
final String photo;
final VoidCallback onTap;
final double width;
Widget build(BuildContext context) {
return new SizedBox(
width: width,
child: new Hero(
tag: photo,
child: new Material(
color: Colors.transparent,
child: new InkWell(
onTap: onTap,
child: new Image.asset(
photo,
fit: BoxFit.contain,
),
),
),
),
);
}
}
// second_page.dart class
import 'package:flutter/material.dart';
import 'package:flutter_test7/photo_hero.dart';
class SecondPage extends StatefulWidget {
@override
_SecondPageState createState() => new _SecondPageState();
}
class _SecondPageState extends State<SecondPage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: const Text('Flippers Page'),
),
body: new Container(
color: Colors.lightBlueAccent,
padding: const EdgeInsets.all(16.0),
alignment: Alignment.topLeft,
child: new PhotoHero(
photo: 'images/flippers-alpha.png',
width: 100.0,
onTap: () {
Navigator.of(context).pop();
},
),
),
);
}
}
希望这可以帮助。
在 Flutter 中实现英雄动画非常容易。 你只需要在登陆页面中导入package:flutter/scheduler.dart 包。 看下面的代码
import 'package:flutter/scheduler.dart' show timeDilation;
请记住添加timeDilation变量并为其分配一个值以在几秒钟内加速或减慢动画。 在您的构建方法之后添加这些,如下例所示
Widget build(BuildContext context) {
timeDilation = 2;
为了更好的动画,只需使用自定义动画
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