if (_countdownTime == 0 && validateMobile()) { //Http请求发送验证码 ... setState(() { _countdownTime = 60; }); //开始倒计时 startCountdownTimer(); } }, child: Text( _countdownTime > 0 ? '$_countdownTime后重新获取' : '获取验证码', style: TextStyle( fontSize: 14, color...
import 'package:flutter/material.dart'; import 'dart:async'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Countdown Timer', home: Scaffold( appBar: AppBar( title: Text('Countdown ...
Flutter的可变参数定义 你可以在 CountdownTimer 类中添加一个可选参数 titleName 并将其默认值设置为空字符串。以下是修改后的代码: classCountdownTimerextendsStatefulWidget{finalint duration;finalint numIterations;finalint breakTime;finalStringtitleName;// 新添加的可选参数constCountdownTimer({Key?key,require...
Cloud Studio代码运行 import'dart:async';import'package:flutter/material.dart';classCountdownextendsStatefulWidget{@override _CountdownStatecreateState()=>_CountdownState();}class_CountdownStateextendsState<Countdown>{Timer _timer;int seconds;@override Widgetbuild(BuildContext context){returnCenter(child:T...
CountdownTimer countDownTimer = new CountdownTimer( new Duration(minutes: 5), new Duration(seconds: 1), ); countdown = countDownTimer.listen(null); countdown.onData((duration) { setState(() { actual = 300 - duration.elapsed.inSeconds; ...
A count-down timer that can be configured to fire once or repeatedly. 即它是一个支持一次或者多次周期性触发的计时器。首先,让我们来熟悉这两种场景下的基本用法。 单次触发 这种情况下的一般场景是作为延时器来使用,我们并不会接收到倒计时的进度,只会在倒计时结束后收到回调提醒。例如,我们来看下 Flutter...
官方实例： new CountDownTimer(30000, 1000) { public void onTick(long millisUntilFinished) { ...
为了实现这样场景的需求,我们需要使用Timer.periodic。 一、引入Timer对应的库 import'dart:async'; 二、定义计时变量 class_LoginPageStateextendsState<LoginPage>{...Timer_timer;int_countdownTime=0;...} 三、点击后开始倒计时 这里我们点击发送验证码文字来举例说明。
1.先看看api文档有没有像安卓CountDownTimer一样的类 地址:https://api.dart.dev/stable/2.4.0/dart-async/Timer-class.html image.png ok,既然有api,那就照着葫芦画瓢 2.导入包 import 'dart:async'; 3.添加一个倒计时方法 class LoginPageState extends State<LoginPage> { ...
flutter_countdown_timer A new Flutter application. Getting Started This project is a starting point for a Flutter application. A few resources to get you started if this is your first Flutter project: Lab: Write your first Flutter app Cookbook: Useful Flutter samples For help getting started wi...