在它们各自的文件夹中,Android 和 ios 有启动画面可以更改。Flutter web 是否有启动画面?我在网页加载之前看到一个白屏。我们如何更改它?那是启动画面还是等待加载时间?
在它们各自的文件夹中,Android 和 ios 有启动画面可以更改。Flutter web 是否有启动画面?我在网页加载之前看到一个白屏。我们如何更改它?那是启动画面还是等待加载时间?
您现在看到的白屏是因为加载时间过长。
我使用闪屏的方法是:
首先启动我的闪屏,然后在init
方法内使用计时器,当计时器结束时调用另一个页面。
main.dart
import 'package:flutter/material.dart';
import 'src/splash_screen.dart';
main() {
runApp(App());
}
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'AppName',
theme: ThemeData(
primaryColor: Colors.white,
backgroundColor: Colors.white,
primaryIconTheme: new IconThemeData(color: Colors.black),
),
home: SplashScreen());
}
}
splash_screen.dart
import "package:flutter/material.dart";
import 'dart:async';
import 'login/login.dart';
class SplashScreen extends StatefulWidget {
_SplashScreenState createState() => _SplashScreenState();
}
class _SplashScreenState extends State<SplashScreen> {
@override
void initState() {
super.initState();
new Timer(new Duration(milliseconds: 1000), () { // set your desired delay time here
Navigator.of(context).pushReplacement(
new MaterialPageRoute(builder: (context) => new LoginScreen()));
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Container(
alignment: Alignment.center,
child: Image.asset(fullLogoPng,
width: MediaQuery.of(context).size.width / 1.5,
fit: BoxFit.scaleDown),
),
);
}
}
background_image
、color
、image
等,可用于修改闪屏屏幕。flutter_native_splash.yaml
文件(位于根目录)包含:flutter_native_splash:
color: "#FFFFFF" #backgound color
image: assets/images/splash.png
只需在终端上运行即可生成启动画面。
flutter pub run flutter_native_splash:create
带动画的启动画面
main.dart
import 'package:flutter/material.dart';
import 'src/splash_screen.dart';
main() {
runApp(App());
}
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
color: Colors.white,
debugShowCheckedModeBanner: false,
theme: ThemeData(
primaryColor: Colors.purple,
primarySwatch: Colors.purple,
fontFamily: 'FIRSNEUE'),
home: SplashScreen());
}
}
splashScreen.dart
import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
class SplashScreen extends StatefulWidget {
@override
SplashScreenState createState() => new SplashScreenState();
}
class SplashScreenState extends State<SplashScreen>
with SingleTickerProviderStateMixin {
var _visible = true;
AnimationController animationController;
Animation<double> animation;
startTime() async {
var _duration = new Duration(seconds: 3); //SetUp duration here
return new Timer(_duration, navigationPage);
}
void navigationPage() {
Navigator.of(context).pushReplacementNamed(HOME_SCREEN);
}
@override
void initState() {
super.initState();
animationController = new AnimationController(
vsync: this, duration: new Duration(seconds: 2));
animation =
new CurvedAnimation(parent: animationController, curve: Curves.easeOut);
animation.addListener(() => this.setState(() {}));
animationController.forward();
setState(() {
_visible = !_visible;
});
startTime();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
fit: StackFit.expand,
children: <Widget>[
new Column(
mainAxisAlignment: MainAxisAlignment.end,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Padding(padding: EdgeInsets.only(bottom: 30.0),child:new
Image.asset('assets/img.png',height: 25.0,fit: BoxFit.scaleDown,))
],),
new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Image.asset(
'assets/logo.png',
width: animation.value * 250,
height: animation.value * 250,
),
],
),
],
),
);
}
}