Question

getDaysInWeek（）列出了从星期日到星期六的日子。

getSevenInWeek（）列出了2019年的第一周。1月1日应该在星期二而不是星期日。

如何使用DateTime类或Date_Utils包下的weekday属性将日期与星期几相匹配？

$project

Answer 1

代替在getSevenInWeek函数中设置日期。像这样在State类中进行操作，然后将其传递给getSevenInWeek和getDaysInWeek：

// no need for a library.
String getDay(int dayNumber) {
  List<String> weekdays = const [
    "Mon",
    "Tue",
    "Wed",
    "Thu",
    "Fri",
    "Sat",
    "Sun",
  ];
  return weekdays[dayNumber];
}

class ThirdRouteState extends State<ThirdRoute> {
  List<DateTime> seven = <DateTime>[];
  @override
  void initState() {
    seven = <DateTime>[];
    DateTime start = DateTime(2019, 01, 01);
    DateTime end = DateTime(2019, 01, 08);
    while (start.isBefore(end)) {
      seven.add(start);
      start = start.add(const Duration(days: 1));
    }
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Calendar Page"),
      ),
      body: Column(children: <Widget>[
        Table(
          children: <TableRow>[
            TableRow(
              children: getDaysInWeek(seven),
            ),
            TableRow(
              children: getSevenInWeek(seven),
            ),
          ],
        ),
      ]),
    );
  }
}

List<Widget> getSevenInWeek(List<DateTime> days) {
  return days.map((DateTime time) {
    return Text(
      new DateFormat("dd").format(time),
      style: TextStyle(backgroundColor: Colors.red),
      textAlign: TextAlign.left,
    );
  }).toList();
}

List<Widget> getDaysInWeek(List<DateTime> days) {
  List<Widget> dayWidgets = [];

  days.forEach(
    (DateTime day) {
      dayWidgets.add(
        new CalendarTile(
          isDayOfWeek: true,
          dayOfWeek: getDay(day.weekday),
        ),
      );
    },
  );

  return dayWidgets;
}

将日期与星期几匹配？

1 个答案: