YearPicker({Key key, @required DateTime selectedDate, @required ValueChanged<DateTime> onChanged, @required DateTime firstDate, @required DateTime lastDate })

Creates a year picker.

The selectedDate and onChanged arguments must not be null. The lastDate must be after the firstDate.

Rarely used directly. Instead, typically used as part of a DatePicker.

Source 

YearPicker({
  Key key,
  @required this.selectedDate,
  @required this.onChanged,
  @required this.firstDate,
  @required this.lastDate
}) : super(key: key) {
  assert(selectedDate != null);
  assert(onChanged != null);
  assert(lastDate.isAfter(firstDate));
}