reactive_forms自定义小部件中的Flutter typeahead textField不显示选定的选项文本

dependencies:
  reactive_forms: ^0.13.0

import 'package:reactive_forms/reactive_forms.dart';

class CustomTypeaheadField<T> extends ReactiveFormField<T> {
  CustomTypeaheadField({
    required String formControlName,
    required List<T> options,
    required String Function(T) displayText,
    required T Function(String) findOption,
  }) : super(
          formControlName: formControlName,
          builder: (field) {
            final formControl = field.control as FormControl<T>;
            final selectedOption = formControl.value;

            return TypeAheadFormField<T>(
              textFieldConfiguration: TextFieldConfiguration(
                decoration: InputDecoration(
                  labelText: 'Typeahead Field',
                ),
              ),
              suggestionsCallback: (pattern) {
                return options.where((option) {
                  final optionText = displayText(option);
                  return optionText.toLowerCase().contains(pattern.toLowerCase());
                }).toList();
              },
              itemBuilder: (context, suggestion) {
                final optionText = displayText(suggestion);
                return ListTile(
                  title: Text(optionText),
                );
              },
              onSuggestionSelected: (suggestion) {
                final optionText = displayText(suggestion);
                formControl.value = suggestion;
                formControl.markAsDirty();
              },
              validator: (value) {
                if (formControl.invalid) {
                  return 'Invalid value';
                }
                return null;
              },
              initialValue: selectedOption,
            );
          },
        );
}

ReactiveForm(
  formGroup: form,
  child: Column(
    children: [
      CustomTypeaheadField<String>(
        formControlName: 'typeaheadField',
        options: ['Option 1', 'Option 2', 'Option 3'],
        displayText: (option) => option,
        findOption: (text) => text,
      ),
      ElevatedButton(
        onPressed: () {
          if (form.valid) {
            // 表单验证通过，执行相应操作
          }
        },
        child: Text('Submit'),
      ),
    ],
  ),
);