Talk is cheap. Show me the code.

Flutter 淘宝App中为了实现聚划算的倒计时，我是这么做的，如下所示。

我就不废话了，这个实现起来不复杂，直接看代码吧

完整代码在 GitHub：

AnimationController _animationController;  String get hoursString {    Duration duration = _animationController.duration * _animationController.value;    return '${(duration.inHours)..toString().padLeft(2, '0')}';  }  String get minutesString {    Duration duration = _animationController.duration * _animationController.value;    return '${(duration.inMinutes % 60).toString().padLeft(2, '0')}';  }  String get secondsString {    Duration duration = _animationController.duration * _animationController.value;    return '${(duration.inSeconds % 60).toString().padLeft(2, '0')}';  }复制代码

void initState() {  //倒计时,注意vsync:this，这里需要混入TickerProviderStateMixin    _animationController = AnimationController(vsync: this, duration: Duration(hours: 10, minutes: 30, seconds: 0));    _animationController.reverse(from: _animationController.value == 0.0 ? 1.0 : _animationController.value);}复制代码

如何使用

AnimatedBuilder(        animation: _animationController,        builder: (_, Widget child) {          return Row(children: 
    
     [            ClipRRect(              borderRadius: BorderRadius.circular(3),              child: Container(                color: Colors.red,                child: Text(                  secondsString,                  style: TextStyle(                    color: Colors.white,                  ),                ),              ),            ),          ]);        });复制代码