87번째줄

title: TextField(

onSubmitted: (value) {

bookService.search(value);

},

코드스니펫 (Text Field의 on Submitted)-> bookService.search(value);이부분을 넣고 search 부분이 오류가 뜸니다

작성한 코드 및 에러 메세지

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import 'book_service.dart';

void main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (context) => BookService()),
      ],
      child: const MyApp(),
    ),
  );
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  HomePage({Key? key}) : super(key: key);

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  var bottomNavIndex = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: [
        SearchPage(),
        LikedBookPage(),
      ].elementAt(bottomNavIndex),
      bottomNavigationBar: BottomNavigationBar(
        selectedItemColor: Colors.black,
        unselectedItemColor: Colors.grey,
        showUnselectedLabels: true,
        selectedFontSize: 12,
        unselectedFontSize: 12,
        iconSize: 28,
        type: BottomNavigationBarType.fixed,
        onTap: (value) {
          setState(() {
            bottomNavIndex = value;
          });
        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            label: '검색',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.star),
            label: '좋아요',
          ),
        ],
        currentIndex: bottomNavIndex,
      ),
    );
  }
}

class SearchPage extends StatelessWidget {
  SearchPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Consumer(
      builder: (context, bookService, child) {
        return Scaffold(
          appBar: AppBar(
            backgroundColor: Colors.white,
            toolbarHeight: 80,
            title: TextField(
              onSubmitted: (value) {
                bookService.search(value);
              },
              cursorColor: Colors.grey,
              decoration: InputDecoration(
                prefixIcon: Icon(Icons.search, color: Colors.grey),
                hintText: "작품, 감독, 배우, 컬렉션, 유저 등",
                border: OutlineInputBorder(
                  borderSide: BorderSide(color: Colors.white),
                  borderRadius: BorderRadius.all(Radius.circular(10)),
                ),
                focusedBorder: OutlineInputBorder(
                  borderSide: BorderSide(color: Colors.grey),
                  borderRadius: BorderRadius.all(Radius.circular(10)),
                ),
              ),
            ),
          ),
          body: Center(
            child: Text("검색"),
          ),
        );
      },
    );
  }
}

class LikedBookPage extends StatelessWidget {
  const LikedBookPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text("좋아요"),
      ),
    );
  }
}


import 'package:dio/dio.dart';
import 'package:flutter/material.dart';

import 'book.dart';

class BookService extends ChangeNotifier {
  List<Book> bookList = []; // 책 목록

  void search(String q) async {
    if (q.isNotEmpty) {
      Response res = await Dio().get(
        "https://www.googleapis.com/books/v1/volumes?q=$q&startIndex=0&maxResults=40",
      );
      List items = res.data["items"];
      print(items);
    }
  }
}