在End:上动画化容器后导航新屏幕

Question

我不喜欢flutter，我想创建一些应用程序。这是我的主屏幕与动画容器。

import 'package:flutter/material.dart';
import "./loginmenu.dart";
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Color.fromRGBO(197, 197, 187, 1),
body: AnimatedContainer(
duration: Duration(milliseconds: 350),
width: double.infinity,
height: double.infinity,
child: Image(image: AssetImage("assets/images/Babapps-logos.jpeg")),
onEnd: () => Navigator.push(
context,
MaterialPageRoute(builder: (context) => loginscreen()),
),
),
),
);
}
}

当动画持续时间结束时，我想去新的屏幕。

import 'package:flutter/material.dart';
class loginscreen extends StatefulWidget {
const loginscreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Column(
children: <Widget>[
Container(width: double.infinity, margin: EdgeInsets.all(130)),
Container(
width: double.infinity,
margin: EdgeInsets.all(5),
child: Center(
child:
Text("Welcome Diet&Life", style: TextStyle(fontSize: 19)),
),
),
Container(
width: 320,
margin: EdgeInsets.all(5),
child: Center(
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(), hintText: "Username"),
),
),
),
Container(
width: 320,
margin: EdgeInsets.all(5),
child: Center(
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(), hintText: "Password"),
)),
),
Container(
child: Center(
child: RaisedButton(
child: Text("Login"),
onPressed: null,
),
),
),
Container(
margin: EdgeInsets.all(10),
child: Center(
child: new InkWell(
child: Text("Don't have an account?"), onTap: null),
),
)
],
),
),
);
}
@override
State<StatefulWidget> createState() {
// TODO: implement createState
throw UnimplementedError();
}
}

但是当我运行这个代码时，动画不会转到另一个屏幕，即使它过期了。我是走在正确的轨道上还是必须使用setstate？

Answer 1

Container上没有任何更改，因此动画onEnd永远不会被调用。

你需要改变容器内的一些东西才能使其动画化。

如果您只是想在延迟后导航，请使用Future.delayed然后导航。

void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return const MaterialApp(home: StartPage());
}
}
class StartPage extends StatefulWidget {
const StartPage({Key? key}) : super(key: key);
@override
State<StartPage> createState() => _StartPageState();
}
class _StartPageState extends State<StartPage> {
Color containerColor = Colors.cyanAccent;
@override
void initState() {
super.initState();
_nextPage();
}
/// just nevigate
_nextPage() async {
Future.delayed(Duration(seconds: 1)).then((value) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => AnimE(),
),
);
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () {
setState(() {
containerColor = Colors.blue;
});
},
),
body: AnimatedContainer(
duration: const Duration(seconds: 2),
color: containerColor,
width: double.infinity,
height: double.infinity,
child: const Text("a"),
onEnd: () {
print("Ebnd"); // paste neviagte by removing init
//        Navigator.push(
//   context,
//   MaterialPageRoute(
//     builder: (context) => loginscreen(),
//   ),
// );
}),
);
}
}