Question

当用户单击日历中的“取消”按钮时，我想使变量为null。我得到了确定按钮的动作。但我不知道如何执行取消操作

下面是我的代码

Future<Null> selectDate(BuildContext context) async {
  final DateTime picked = await showDatePicker(
    context: context,
    initialDate: selectedDate,
    firstDate: DateTime(2015, 8),
    lastDate: DateTime(2101),
  );
  if (picked != null && picked != selectedDate) {
    selectedDate = picked;
  }

  formattedDate = DateFormat('yyyy-MM-dd').format(selectedDate);
  print('selected date  is '+ "$formattedDate");

  setState(() {});
}

Answer 1

showDatePicker将选定的日期返回给您。因此，如果单击“取消”按钮，它将返回null。

如果您想取消控制，您可以这样做

final DateTime picked = await showDatePicker(
  context: context,
  initialDate: selectedDate,
  firstDate: DateTime(2015, 8),
  lastDate: DateTime(2101),
);
if(picked == null){
  print("Hi bro, i came from cancel button or via click outside of datepicker");
}

颤振日历取消动作

1 个答案: