2024年1月24日发(作者：)

Flutter倒计时功能import 'dart:async';import 'package:flutter/';import 'package:flutter/';void main() => runApp(MyApp());class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: , ), home: Scaffold( appBar: AppBar(title: Text('倒计时'),), body: MyHomePage(), ) ); }}class MyHomePage extends StatefulWidget { @override _MyHomePageState createState() => _MyHomePageState();}class _MyHomePageState extends State { Duration time; var seconds = 0; Timer countdownTimer; @override Widget build(BuildContext context) { return Container( child:Center( child: Column( children: [ RaisedButton( child: Text('定时'), onPressed: () { showCupertinoModalPopup( context: context, builder: (BuildContext context) { return Container( height: 200, color: , child: DefaultTextStyle( style: const TextStyle( color: , fontSize: 22.0, ), child: CupertinoTimerPicker( //initialTimerDuration: time, //minuteInterval: 5, mode: , onTimerDurationChanged: (Duration newTimer) { setState(() { time = newTimer; seconds = nds; // flag = true; }); }, ), )); }, ); }, ),

RaisedButton( child: Text('开始倒计时'), onPressed: () { if (countdownTimer != null) { return; } countdownTimer = new ic(new Duration(seconds: 1), (timer) { setState(() { if (seconds > 0) { seconds--; } else { (); countdownTimer = null; } }); }); }, ), Text( '倒计时： $seconds' + '秒', style: TextStyle(fontSize: 30), ), ], ), )

); }}