我正在尝试在我拥有的特定日期创建倒计时,并显示到那时还有多少小时、分钟和秒......
例如我想将计数器日期设置为:2018 年 10 月 25 日星期四 7:14:05 AM
我想为用户显示..剩余时间:hh:mm:ss 到 10 月 25 日 ...
我试过这个:
@override
void initState() {
new CountdownTimer(new Duration(milliseconds: 1540451645), new Duration(seconds: 1)).listen((data) {
print('Remaining time: ${data.remaining.inSeconds}');
print(new DateTime.now().millisecondsSinceEpoch);
print(DateTime.fromMillisecondsSinceEpoch(data.remaining.inSeconds));
var format = new DateFormat("hh:mm:ss");
var dateString = format.format(DateTime.fromMillisecondsSinceEpoch(data.remaining.inSeconds));
print(dateString);
});
super.initState();
}
但结果是:03:25:40.. 这真的不是真的......
如何做到这一点?
最佳答案
首先 - 有错误:您必须使用 data.remaining.inMilliseconds
而不是 data.remaining.inSeconds
对于格式化,最好使用 Duration 而不是 DateTime。但是您可以像这样更改现有代码:
var format = new DateFormat("mm:ss");
var dateString = '${data.remaining.inHours}:${format.format(DateTime.fromMillisecondsSinceEpoch(data.remaining.inMilliseconds))};
print(dateString);
UPD 显示剩余时间的小部件
int estimateTs = DateTime(2018, 11, 5, 7, 15, 30).millisecondsSinceEpoch; // set needed date
....
StreamBuilder(
stream: Stream.periodic(Duration(seconds: 1), (i) => i),
builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
DateFormat format = DateFormat("mm:ss");
int now = DateTime
.now()
.millisecondsSinceEpoch;
Duration remaining = Duration(milliseconds: estimateTs - now);
var dateString = '${remaining.inHours}:${format.format(
DateTime.fromMillisecondsSinceEpoch(remaining.inMilliseconds))}';
print(dateString);
return Container(color: Colors.greenAccent.withOpacity(0.3),
alignment: Alignment.center,
child: Text(dateString),);
});
关于dart - Dart 中的日期倒计时,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52944180/