flutter实现倒计时加载页面
时间:2022-08-09 08:33:42|栏目:Android代码|点击: 次
本文实例为大家分享了flutter实现倒计时加载页面的具体代码,供大家参考,具体内容如下
效果图
实现步骤
1、pubspec.yaml中添加依赖 flustars,该包的TimelineUtil和TimerUtil类可以实现计时功能
dependencies: flustars: ^0.3.3
!注意空格哦
2、代码实现
初始化TimerUtil
late TimerUtil util; double current_time = 0; void initState() { super.initState(); util = new TimerUtil(mInterval: 18, mTotalTime: 5000); util.setOnTimerTickCallback((millisUntilFinished) { setState(() { //每次时间间隔回调,把每次当前总时间ms除以1000就是秒 current_time = millisUntilFinished / 1000; //倒计时结束时 跳转到首页 当然也可以等待资源加载完成再跳转 if (current_time == 0) { /*等待资源完成代码块*/ //跳转到首页 Navigator.push( context, MaterialPageRoute(builder: (context) => HomePage())); } }); });
构造页面
Widget build(BuildContext context) { return Scaffold( body: Column( children: [ Image.asset('images/2.0/beijing.jpg'), Container( alignment: Alignment.centerRight, child: SizedBox( height: 50, width: 50, child: Stack( children: [ Center(child: CircularProgressIndicator( value: current_time == 5.0 ? 0 : (5 - current_time) / 5, ),), Center(child: Text('${current_time.toInt()}'),) ],) ), ), ], )); }
完整代码
import 'package:flustars/flustars.dart'; import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: LoadingPage(), ); } } class LoadingPage extends StatefulWidget { const LoadingPage({Key? key}) : super(key: key); @override _LoadingPageState createState() => _LoadingPageState(); } class _LoadingPageState extends State<LoadingPage> { late TimerUtil util; //计时对象 double current_time = 0; //当前时间 @override Widget build(BuildContext context) { return Scaffold( body: Column( children: [ Image.asset('images/2.0/beijing.jpg'), Container( alignment: Alignment.centerRight, child: SizedBox( height: 50, width: 50, child: Stack( children: [ Center(child: CircularProgressIndicator( value: current_time == 5.0 ? 0 : (5 - current_time) / 5, ),), Center(child: Text('${current_time.toInt()}'),) ],) ), ), ], )); } @override void initState() { super.initState(); util = new TimerUtil(mInterval: 18, mTotalTime: 5000); util.setOnTimerTickCallback((millisUntilFinished) { setState(() { //每次时间间隔回调,把每次当前总时间ms除以1000就是秒 current_time = millisUntilFinished / 1000; //倒计时结束时 跳转到首页 当然也可以等待资源加载完成再跳转 if (current_time == 0) { /*等待资源完成代码块*/ //跳转到首页 Navigator.push( context, MaterialPageRoute(builder: (context) => HomePage())); } }); }); //开始倒计时 util.startCountDown(); } } class HomePage extends StatelessWidget { const HomePage({Key? key}) : super(key: key); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('HomePage'), ), ); } }
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