flutter calendar carousel 根据月份显示事件

Question

我正在尝试使用 flutter 日历轮播构建一个日历应用程序。我需要做的是在用户滑动月份时显示分配给月份的事件。

checkCurrentMonth() {
    selectedMonth = DateTime.parse(_targetDateTime.toString()).month.toInt();
    selectedYear = DateTime.parse(_targetDateTime.toString()).year.toInt();

    _markedDateMap.events.forEach((key, value) {
      // print(_markedDateMap.events);

      print(DateTime.parse(key.toString()).month.toInt());
      if (selectedMonth == DateTime.parse(key.toString()).month.toInt() &&
          selectedYear == DateTime.parse(key.toString()).year.toInt()) {
        // print(_markedDateMap.events[key]);
        _selectedHolidays.add(_markedDateMap.events[key]);
      }
    });

    // for (var item in _selectedHolidays) {
    //   print("000000000000000 $item");
    //   gatheredEvents.add(GatherEvents.fromJson(item));
    // }
    print(_selectedHolidays[0].getTitle());
    print(_markedDateMap.events.length);
  }

我收到以下错误。

Class 'List<Event>' has no instance getter 'getTitle'.
Receiver: Instance(length:1) of '_GrowableList'
Tried calling: getTitle

这是我的 _markedDateMap

EventList<Event> _markedDateMap = new EventList<Event>(
    events: {
      new DateTime(2020, 12, 29): [
        new Event(
          date: new DateTime(2020, 12, 29),
          title: 'Poya Day',
          icon: _poyaeventIcon(DateTime(2020, 12, 29).day.toString()),
          dot: Container(
            margin: EdgeInsets.symmetric(horizontal: 1.0),
            color: Colors.red,
            height: 5.0,
            width: 5.0,
          ),
        ),
      ],
      new DateTime(2021, 01, 14): [
        new Event(
          date: new DateTime(2021, 01, 14),
          title: 'Tamil Thai Pongal Day',
          icon: _otheralleventIcon(DateTime(2021, 01, 14).day.toString()),
          dot: Container(
            margin: EdgeInsets.symmetric(horizontal: 1.0),
            color: Colors.red,
            height: 5.0,
            width: 5.0,
          ),
        ),
      ],
    },
  );

请帮我解决这个问题。

Answer 1

除了本机 built-in 方法外，您不能在 List 上调用其他方法。您实际上是在 Event 的列表上调用方法 getTitle。如果您想查看列表中所有事件的标题，您必须使用循环或获取特定索引。

for (var event in _selectedHolidays[0]) print(event.getTitle());

// or

print(_selectedHolidays[0].first.getTitle());

flutter calendar carousel 根据月份显示事件

flutter calendar carousel show events according to the month

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