我一直在使用Dart计时器类进行开发,目前已经可以基本实现它的功能,但是我卡在尝试添加暂停功能上。我查看了他们的文档,但是关于计时器类的内容并不多...
是否有办法在单击时暂停和恢复计时器/倒计时?这是我目前已经实现的:
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 Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Timer _timer;
int _start = 10;
void startTimer() {
const oneSec = const Duration(seconds: 1);
_timer = new Timer.periodic(
oneSec,
(Timer timer) => setState(() {
if (_start < 1) {
timer.cancel();
} else {
_start = _start - 1;
}
}));
}
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(title: Text("Timer test")),
body: Column(
children: <Widget>[
RaisedButton(
onPressed: () {
startTimer();
},
child: Text("start"),
),
Text("$_start")
],
));
}
}
timer
每秒运行一次,并在需要时将其冻结,但我意识到您的库仅适用于在特定时间段后使代码运行。 - Opeyemi Sanusitimer.reset(); timer.start();
就可以重新启动它(使其周期性)。以下是一个使用它实现倒计时的示例,与你想要的相同,只是定时器将在一定次数后结束:https://pub.dev/packages/pausable_timer#example-pausable-countdown-implementation - luca