启动页Splash Screen

启动屏幕(也叫闪屏)是用户在启动应用程序时看到的第一个屏幕。它也可以是应用程序的欢迎屏幕。

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const Splash(),
      
    );
  }
}

class Splash extends StatefulWidget {
  const Splash({Key? key}) : super(key: key);
  @override
  State<Splash> createState() => _SplashState();
}

class _SplashState extends State<Splash> {
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    Future.delayed(const Duration(seconds: 3),(){
      Navigator.push(context,  MaterialPageRoute(builder: (context) {
        return MyHomePage(title: '启动页',);
      }),
      );
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.amber,
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Image.asset('images/logo.png',height: 200,width: 200,),
            const SizedBox(height: 30,),
            if(Platform.isIOS)
             const CupertinoActivityIndicator(
                radius: 20,
              )
            else
              const CircularProgressIndicator(
                color: Colors.white,
              )

          ],
        ),
      ),
    );
  }
}