Flutter TextFormField 未更新其值

Question

我制作了一个 TimePicker，当用户点击textFormField时它会弹出它工作正常但唯一的问题是我想用从timePicker中选择的值更新textFormField值我已经声明了controller并初始化了一个selectedTimer

  TimeOfDay selectedTime = TimeOfDay(hour: 0, minute: 0);
  TextEditingController _timeController = TextEditingController();

这是TextFormField的代码

 TextFormField(
      controller: _timeController,
      onTap: () {
         FocusScope.of(context).requestFocus(new FocusNode());
         _selectTime(context);
      },
  ),

这是方法_selectTime的代码

_selectTime(BuildContext context) async {
    final TimeOfDay? timeOfDay = await showTimePicker(
      context: context,
      initialTime: selectedTime,
      initialEntryMode: TimePickerEntryMode.dial,
    );
    if (timeOfDay != null && timeOfDay != selectedTime) {
      setState(() {
        selectedTime = timeOfDay;
        TextEditingValue(text: timeOfDay.toString());
      });
    }
  }

Answer 1

如下操作：

_timeController.text=timeOfDay.toString();

Answer 2

 selectTime(BuildContext context) async {
final TimeOfDay? timeOfDay = await showTimePicker(
  context: context,
  initialTime: selectedTime,
  initialEntryMode: TimePickerEntryMode.dial,
);
if (timeOfDay != null && timeOfDay != selectedTime) {
  setState(() {
    selectedTime = timeOfDay;
    _timeController.text=timeOfDay.toString();
    TextEditingValue(text: timeOfDay.toString());
  });
}

}

Answer 3

删除此行TextEditingValue(text: timeOfDay.toString());

并替换为这个_timeController.text = selectedTime.toString();