flutter-弧形導(dǎo)航欄設(shè)置導(dǎo)航頁面

下午好，我是flutter的新手，我正在嘗試使用curved_navigation_bar，但是我不知道如何設(shè)置頁面導(dǎo)航，這是我的代碼，索引0將轉(zhuǎn)到news.dart頁面，索引1將轉(zhuǎn)到cells.dart頁面，索引2將轉(zhuǎn)到home.dart頁面，索引3轉(zhuǎn)到book.dart頁面，索引4轉(zhuǎn)到info.dart頁面，出現(xiàn)的第一個頁面是索引2，非常感謝。

    import 'package:curved_navigation_bar/curved_navigation_bar.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:statistik_malang/body.dart';
import 'package:statistik_malang/constants.dart';

class HomeScreen extends StatefulWidget {
  // const HomeScreen({ Key? key }) : super(key: key);

  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // appBar: AppBar(),
      body: Body(),
      extendBody: true,
      bottomNavigationBar: CurvedNavigationBar(
        backgroundColor: Colors.transparent,
        buttonBackgroundColor: kPrimaryColor,
        animationDuration: Duration(milliseconds: 300),
        height: 50,
        items: <Widget>[
          SvgPicture.asset(
            "assets/icons/news.svg",
            width: 20.0,
            height: 20.0,
          ),
          SvgPicture.asset(
            "assets/icons/cells.svg",
            width: 20.0,
            height: 20.0,
          ),
          SvgPicture.asset(
            "assets/icons/home.svg",
            width: 20.0,
            height: 20.0,
          ),
          SvgPicture.asset(
            "assets/icons/book.svg",
            width: 20.0,
            height: 20.0,
          ),
          SvgPicture.asset(
            "assets/icons/information.svg",
            width: 20.0,
            height: 20.0,
          ),
        ],
        onTap: (index) {},
      ),
    );
  }
}