Flutter:关闭软键盘后如何保持TextField值

FocusNode _focusNode = FocusNode();

FocusScope(
  node: FocusScopeNode(),
  child: TextField(
    focusNode: _focusNode,
    // 其他属性...
  ),
)

TextEditingController _controller = TextEditingController();

TextField(
  controller: _controller,
  // 其他属性...
)

// 关闭软键盘后清空TextField的值
void _closeKeyboard() {
  FocusScope.of(context).requestFocus(FocusNode());
  _controller.clear();
}

GlobalKey<FormFieldState<String>> _formKey = GlobalKey<FormFieldState<String>>();

Form(
  key: _formKey,
  child: TextFormField(
    key: _formKey,
    // 其他属性...
  ),
)

// 关闭软键盘后获取TextField的值
void _closeKeyboard() {
  FocusScope.of(context).requestFocus(FocusNode());
  String value = _formKey.currentState.value;
}