Flutter 如何使倒计时计时器在不同的持续时间之间自动切换?
我想为健身应用程序创建一个计时器。所以,我需要计时器以“3,2,1”开头。。然后它切换到40秒的倒计时。40秒结束后,它会自动切换到10秒计时器。这个过程会重复X个集合,就像健身应用程序一样 下面是我的代码。它可以正常启动和停止。但我无法/不知道如何让它自动重复到我想要的倒计时Flutter 如何使倒计时计时器在不同的持续时间之间自动切换?,flutter,Flutter,我想为健身应用程序创建一个计时器。所以,我需要计时器以“3,2,1”开头。。然后它切换到40秒的倒计时。40秒结束后,它会自动切换到10秒计时器。这个过程会重复X个集合,就像健身应用程序一样 下面是我的代码。它可以正常启动和停止。但我无法/不知道如何让它自动重复到我想要的倒计时 import 'package:flutter/material.dart'; import 'dart:math' as math; class EachCardPage extends StatefulWidget
import 'package:flutter/material.dart';
import 'dart:math' as math;
class EachCardPage extends StatefulWidget {
@override
_EachCardPageState createState() => _EachCardPageState();
}
class _EachCardPageState extends State<EachCardPage>
with TickerProviderStateMixin {
AnimationController controller;
bool isExercising;
String get timerString {
Duration duration = controller.duration * controller.value;
return '${duration.inMinutes}:${(duration.inSeconds % 60).toString().padLeft(2, '0')}';
}
@override
void initState() {
super.initState();
isExercising = false;
controller = AnimationController(
vsync: this,
duration: Duration(seconds: 5),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.green,
body: AnimatedBuilder(
animation: controller,
builder: (context, child) {
return Stack(
children: <Widget>[
Align(
alignment: Alignment.bottomCenter,
child: Container(
color: Color(0xFF2D3653),
height:
controller.value * MediaQuery.of(context).size.height,
),
),
Padding(
padding: EdgeInsets.all(8.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Expanded(
child: Align(
alignment: FractionalOffset.center,
child: AspectRatio(
aspectRatio: 1.0,
child: Stack(
children: <Widget>[
Positioned.fill(
child: CustomPaint(
painter: CustomTimerPainter(
animation: controller,
backgroundColor: Colors.white,
color: Colors.blue,
)),
),
Align(
alignment: FractionalOffset.center,
child: Column(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
crossAxisAlignment:
CrossAxisAlignment.center,
children: <Widget>[
Text(
"Count Down Timer",
style: TextStyle(
fontSize: 20.0,
color: Colors.white),
),
Text(
timerString,
style: TextStyle(
fontSize: 112.0,
color: Colors.white),
),
],
),
),
],
),
),
),
),
AnimatedBuilder(
animation: controller,
builder: (context, child) {
return FloatingActionButton.extended(
onPressed: () {
setState(() {
isExercising = true;
});
if (controller.isAnimating) {
controller.stop();
} else {
controller.reverse(
from: controller.value == 0.0
? 1.0
: controller.value);
}
},
icon: Icon(controller.isAnimating
? Icons.pause
: Icons.play_arrow),
label: Text(
controller.isAnimating ? "Pause" : "Play"));
}),
],
),
),
],
);
}),
);
}
}
class CustomTimerPainter extends CustomPainter {
CustomTimerPainter({
this.animation,
this.backgroundColor,
this.color,
}) : super(repaint: animation);
final Animation<double> animation;
final Color backgroundColor, color;
@override
void paint(Canvas canvas, Size size) {
Paint paint = Paint()
..color = backgroundColor
..strokeWidth = 10.0
..strokeCap = StrokeCap.butt
..style = PaintingStyle.stroke;
canvas.drawCircle(size.center(Offset.zero), size.width / 2.0, paint);
paint.color = color;
double progress = (1.0 - animation.value) * 2 * math.pi;
canvas.drawArc(Offset.zero & size, math.pi * 1.5, -progress, false, paint);
}
@override
bool shouldRepaint(CustomTimerPainter old) {
return animation.value != old.animation.value ||
color != old.color ||
backgroundColor != old.backgroundColor;
}
}
导入“包装:颤振/材料.省道”;
导入'dart:math'作为数学;
类EachCardPage扩展StatefulWidget{
@凌驾
_EachCardPageState createState()=>EachCardPageState();
}
类_每个CardPageState扩展状态
使用TickerProviderStateMixin{
动画控制器;
手术切除;
字符串获取timerString{
持续时间=controller.Duration*controller.value;
返回${duration.inMinutes}:${(duration.inSeconds%60).toString().padLeft(2,'0')};
}
@凌驾
void initState(){
super.initState();
isExercising=假;
控制器=动画控制器(
vsync:这个,,
持续时间:持续时间(秒数:5),
);
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
背景颜色:Colors.green,
body:AnimatedBuilder(
动画:控制器,
生成器:(上下文,子对象){
返回堆栈(
儿童:[
对齐(
对齐:对齐.bottomCenter,
子:容器(
颜色:颜色(0xFF2D3653),
高度:
controller.value*MediaQuery.of(context).size.height,
),
),
填充物(
填充:边缘设置。全部(8.0),
子:列(
mainAxisAlignment:mainAxisAlignment.spaceBetween,
儿童:[
扩大(
子对象:对齐(
对齐:分馏loffset.center,
孩子:AspectRatio(
aspectRatio:1.0,
子:堆栈(
儿童:[
定位填充(
孩子:定制油漆(
油漆工:定制油漆工(
动画:控制器,
背景颜色:Colors.white,
颜色:颜色,蓝色,
)),
),
对齐(
对齐:分馏loffset.center,
子:列(
主轴对准:
MainAxisAlignment.space,
横轴对齐:
交叉轴对齐。中心,
儿童:[
正文(
“倒计时”,
样式:TextStyle(
字体大小:20.0,
颜色:颜色。白色),
),
正文(
时间字符串,
样式:TextStyle(
字体大小:112.0,
颜色:颜色。白色),
),
],
),
),
],
),
),
),
),
动画生成器(
动画:控制器,
生成器:(上下文,子对象){
return FloatingActionButton.extended(
已按下:(){
设置状态(){
isExercising=true;
});
if(控制器正在初始化){
controller.stop();
}否则{
控制器。反向(
from:controller.value==0.0
? 1.0
:controller.value);
}
},
图标:图标(controller.isAnimating)
?图标。暂停
:图标。播放(箭头),
标签:文本(
controller.isAnimating?“暂停”:“播放”);
}),
],
),
),
],
);
}),
);
}
}
类CustomTimerPaint扩展了CustomPainter{
自定义时间油漆工({
这个,动画,
这个背景色,
这个颜色,
}):super(重新绘制:动画);
最终动画;
最终颜色背景色,颜色;
@凌驾
空心油漆(帆布,尺寸){
油漆油漆=油漆()
…颜色=背景颜色
..冲程宽度=10.0
..strokeCap=strokeCap.butt
..风格=绘画风格.笔划;
画布.画圈(大小.中心(偏移.零),大小.宽度/2.0,绘制);
paint.color=颜色;
双进度=(
class TimersIssue extends StatefulWidget {
@override
_TimersIssueState createState() => _TimersIssueState();
}
class _TimersIssueState extends State<TimersIssue> {
Timer _countdownTimer;
String displayCountdown = '0';
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
child: Text('Start'),
onPressed: () => runTimer(3),
),
RaisedButton(
child: Text('Reset'),
onPressed: resetTimer,
),
Text(displayCountdown)
],
),
);
}
void runTimer(int seconds){
_countdownTimer = Timer.periodic(Duration(seconds: 1), (timer){
setState(() {
displayCountdown = (seconds-timer.tick+1).toString();
});
if(timer.tick == seconds){
_countdownTimer.cancel();
nextTimer(seconds);
}
});
}
void nextTimer(int seconds){
switch(seconds){
case 3:
runTimer(30);
break;
case 40:
runTimer(10);
break;
case 10:
runTimer(40);
}
}
void resetTimer(){
_countdownTimer.cancel();
setState(() {
displayCountdown = '0';
});
}
}