一个简单的 flutter 倒计时器小部件

倒计时计时器

一个简单的 Flutter 倒计时计时器小部件。从结束时间戳倒计时，在倒计时结束后触发一个事件。

安装

将此添加到您的包的pubspec.yaml文件中

dependencies:
  flutter_countdown_timer: ^4.1.0

安装它

$ flutter pub get

倒计时计时器

名称	描述
endWidget	倒计时结束时显示的窗口小部件
widgetBuilder	Widget Function(BuildContext context, CurrentRemainingTime time)
控制器	CountdownTimer 开始和处置控制器
endTime	倒计时结束时间戳
onEnd	倒计时结束事件
文本样式	文本颜色

CountdownTimerController

名称	描述
endTime	倒计时结束时间戳
onEnd	倒计时结束事件

示例

易于使用

int endTime = DateTime.now().millisecondsSinceEpoch + 1000 * 30;

...
CountdownTimer(
  endTime: endTime,
),

在结束时执行事件。

int endTime = DateTime.now().millisecondsSinceEpoch + 1000 * 30;

void onEnd() {
  print('onEnd');
}

...
CountdownTimer(
  endTime: endTime,
  onEnd: onEnd,
),

使用控制器提前结束倒计时。

  CountdownTimerController controller;
  int endTime = DateTime.now().millisecondsSinceEpoch + 1000 * 30;

  @override
  void initState() {
    super.initState();
    controller = CountdownTimerController(endTime: endTime, onEnd: onEnd);
  }

  void onEnd() {
    print('onEnd');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
          CountdownTimer(
              controller: controller,
              onEnd: onEnd,
              endTime: endTime,
          ),
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.stop),
        onPressed: () {
          onEnd();
          controller.disposeTimer();
        },
      ),
    );
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

自定义样式。

  int endTime = DateTime.now().millisecondsSinceEpoch + 1000 * 30;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
          CountdownTimer(
            endTime: endTime,
            widgetBuilder: (_, CurrentRemainingTime time) {
              if (time == null) {
                return Text('Game over');
              }
              return Text(
                  'days: [ ${time.days} ], hours: [ ${time.hours} ], min: [ ${time.min} ], sec: [ ${time.sec} ]');
            },
          ),
      ),
    );
  }

使用毫秒动画

class _CountdownTimerPageState extends State<CountdownTimerPage>
    with SingleTickerProviderStateMixin {
  late CountdownTimerController controller;
  int endTime = DateTime.now().millisecondsSinceEpoch +
      Duration(seconds: 30).inMilliseconds;

  @override
  void initState() {
    super.initState();
    controller =
        CountdownTimerController(endTime: endTime, onEnd: onEnd, vsync: this);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[
          CountdownTimer(
            controller: controller,
            widgetBuilder: (BuildContext context, CurrentRemainingTime? time) {
              if (time == null) {
                return Text('Game over');
              }
              List<Widget> list = [];
              if (time.sec != null) {
                list.add(Row(
                  children: <Widget>[
                    Icon(Icons.sentiment_very_satisfied),
                    Text(time.sec.toString()),
                  ],
                ));
              }
              if (time.milliseconds != null) {
                list.add(Row(
                  children: <Widget>[
                    Icon(Icons.sentiment_very_satisfied),
                    AnimatedBuilder(
                      animation: time.milliseconds!,
                      builder: (context, child) {
                        return Text("${(time.milliseconds!.value * 1000).toInt()}");
                      },
                    )
                  ],
                ));
              }
              return Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: list,
              );
            },
          ),
        ],
      ),
    );
  }

}

在 ListView.builder 中

class ListViewPage extends StatefulWidget {
  static final String rName = "ListView";

  @override
  _ListViewPageState createState() => _ListViewPageState();
}

class _ListViewPageState extends State<ListViewPage> {
  int endTime = DateTime.now().millisecondsSinceEpoch + 1000 * 60 * 60;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView.builder(
        itemCount: 200,
        itemBuilder: (context, index) {
          if (index == 0) {
            return _CountdownDemo(endTime);
          } else {
            return Container(
              height: 200,
              color: Colors.blue,
              margin: EdgeInsets.all(10),
            );
          }
        },
      ),
    );
  }
}

class _CountdownDemo extends StatefulWidget {
  final int endTime;

  _CountdownDemo(this.endTime);

  @override
  __CountdownDemoState createState() => __CountdownDemoState();
}

class __CountdownDemoState extends State<_CountdownDemo> {
  CountdownTimerController countdownTimerController;

  @override
  Widget build(BuildContext context) {
    return CountdownTimer(
      controller: countdownTimerController,
    );
  }

  @override
  void initState() {
    super.initState();
    countdownTimerController =
        CountdownTimerController(endTime: widget.endTime);
  }
}

倒计时

CountdownController countdownController = CountdownController(duration: Duration(minutes: 1));


Scaffold(
      body: Center(
        child: Countdown(countdownController: countdownController),
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(countdownController.isRunning ? Icons.stop : Icons.play_arrow),
        onPressed: () {
          if(!countdownController.isRunning) {
          ///start
            countdownController.start();
          } else {
          ///pause
            countdownController.stop();
          }
          setState(() {
            ///change icon
          });
        },
      ),
    )