flutter web 中的启动画面

Question

在各自的文件夹中有 Android 和 ios 启动画面，我们可以对其进行更改。是否有用于 flutter web 的启动画面？我在加载网页之前看到一个白屏。我们怎样才能改变它？这是启动画面还是加载等待时间？

Answer 1

您现在看到的白屏是加载时间造成的

我使用启动画面的做法是

我首先在 init 方法

中启动启动画面

我正在使用定时器，一旦定时器结束

我正在调用另一个页面

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),
      ),
    );
  }
}

Answer 2

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,
              ),
            ],
          ),
        ],
      ),
    );
  }
}

Answer 3

When your app is opened, there is a brief time while the native app loads Flutter. By default, during this time, the native app displays a white splash screen.

您可以使用 flutter_native_splash 更改此设置，其中包含有关使用此软件包的丰富文档。

您无需阅读其他文本，直接进入flutter_native_splash。

从这个包的setting-the-splash-screen开始，它带有一些参数，如background_image、color、image用于splash等，可用于修改splash-屏幕。

我的 flutter_native_splash.yaml 文件（在根目录中）包含

flutter_native_splash:
  color: "#FFFFFF" #backgound color
  image: assets/images/splash.png

只需在终端上运行生成启动画面。

flutter pub run flutter_native_splash:create

flutter web 中的启动画面

Splash Screen in flutter web

flutter

splash-screen

flutter-web