类型 'Rx<DateTime>' 不是类型转换中 'DateTime' 类型的子类型

Question

我调用了要在注册屏幕上使用的showDatePicker函数。由于我使用getx编写，所以我使用obs来即时显示所选值，但是我遇到了如下错误:

类型'Rx'不是类型'DateTime'的子类型

class RegisterScreen extends GetWidget<RegisterController> {
RegisterScreen({Key? key}) : super(key: key);
static const routeName = "/register_screen";
DateTime _selectedDate = DateTime.now().obs as DateTime;
late BuildContext _context;

Obx(() => GestureDetector(
onTap: (() async {
var initialDate = DateTime.now();
_selectedDate = await showDatePicker(
context: context,
initialDate: initialDate,
firstDate: DateTime(1930),
lastDate: DateTime(2100),
) ??
_selectedDate;
print(_selectedDate.toIso8601String());
}),
child: Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(16),
),
child: Padding(
padding: const EdgeInsets.all(12.0),
child: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: [
const Icon(
FontAwesomeIcons.calendar,
size: 30,
),
Expanded(
child: Text(
DateFormat("EEE,MMM d")
.format(_selectedDate),
textAlign: TextAlign.center,
),
),
],
),
),
),
)),

Answer 1

你需要改变这个:

DateTime _selectedDate = DateTime.now().obs as DateTime;

:

var _selectedDate = DateTime.now().obs;

并且像这样使用_selectedDate的值:

_selectedDate.value

点击这里了解更多关于GetX的信息。