Flutter - 如何制作自定義底部導航欄

Question

誰能幫助我如何在我的應用程序中實現這個自定義底部導航欄？ 我是 flutter 的新手。

Answer 1

您可以檢查此示例：

import 'package:flutter/material.dart';

void main() {
runApp(const MyApp());
}

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

// This widget is the root of your application.
@override
Widget build(BuildContext context) {
    return MaterialApp(
    title: 'Bottom NavBar Demo',
    theme: ThemeData(
        primaryColor: const Color(0xff2F8D46),
        splashColor: Colors.transparent,
        highlightColor: Colors.transparent,
        hoverColor: Colors.transparent,
    ),
    debugShowCheckedModeBanner: false,
    home: const HomePage(),
    );
}
}

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

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

class _HomePageState extends State<HomePage> {
int pageIndex = 0;

final pages = [
    const Page1(),
    const Page2(),
    const Page3(),
    const Page4(),
];

@override
Widget build(BuildContext context) {
    return Scaffold(
    backgroundColor: const Color(0xffC4DFCB),
    appBar: AppBar(
        leading: Icon(
        Icons.menu,
        color: Theme.of(context).primaryColor,
        ),
        title: Text(
        "Geeks For Geeks",
        style: TextStyle(
            color: Theme.of(context).primaryColor,
            fontSize: 25,
            fontWeight: FontWeight.w600,
        ),
        ),
        centerTitle: true,
        backgroundColor: Colors.white,
    ),
    body: pages[pageIndex],
    bottomNavigationBar: buildMyNavBar(context),
    );
}

Container buildMyNavBar(BuildContext context) {
    return Container(
    height: 60,
    decoration: BoxDecoration(
        color: Theme.of(context).primaryColor,
        borderRadius: const BorderRadius.only(
        topLeft: Radius.circular(20),
        topRight: Radius.circular(20),
        ),
    ),
    child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceAround,
        children: [
        IconButton(
            enableFeedback: false,
            onPressed: () {
            setState(() {
                pageIndex = 0;
            });
            },
            icon: pageIndex == 0
                ? const Icon(
                    Icons.home_filled,
                    color: Colors.white,
                    size: 35,
                )
                : const Icon(
                    Icons.home_outlined,
                    color: Colors.white,
                    size: 35,
                ),
        ),
        IconButton(
            enableFeedback: false,
            onPressed: () {
            setState(() {
                pageIndex = 1;
            });
            },
            icon: pageIndex == 1
                ? const Icon(
                    Icons.work_rounded,
                    color: Colors.white,
                    size: 35,
                )
                : const Icon(
                    Icons.work_outline_outlined,
                    color: Colors.white,
                    size: 35,
                ),
        ),
        IconButton(
            enableFeedback: false,
            onPressed: () {
            setState(() {
                pageIndex = 2;
            });
            },
            icon: pageIndex == 2
                ? const Icon(
                    Icons.widgets_rounded,
                    color: Colors.white,
                    size: 35,
                )
                : const Icon(
                    Icons.widgets_outlined,
                    color: Colors.white,
                    size: 35,
                ),
        ),
        IconButton(
            enableFeedback: false,
            onPressed: () {
            setState(() {
                pageIndex = 3;
            });
            },
            icon: pageIndex == 3
                ? const Icon(
                    Icons.person,
                    color: Colors.white,
                    size: 35,
                )
                : const Icon(
                    Icons.person_outline,
                    color: Colors.white,
                    size: 35,
                ),
        ),
        ],
    ),
    );
}
}

class Page1 extends StatelessWidget {
const Page1({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
    return Container(
    color: const Color(0xffC4DFCB),
    child: Center(
        child: Text(
        "Page Number 1",
        style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
        ),
        ),
    ),
    );
}
}

class Page2 extends StatelessWidget {
const Page2({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
    return Container(
    color: const Color(0xffC4DFCB),
    child: Center(
        child: Text(
        "Page Number 2",
        style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
        ),
        ),
    ),
    );
}
}

class Page3 extends StatelessWidget {
const Page3({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
    return Container(
    color: const Color(0xffC4DFCB),
    child: Center(
        child: Text(
        "Page Number 3",
        style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
        ),
        ),
    ),
    );
}
}

class Page4 extends StatelessWidget {
const Page4({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
    return Container(
    color: const Color(0xffC4DFCB),
    child: Center(
        child: Text(
        "Page Number 4",
        style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
        ),
        ),
    ),
    );
}
}

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更多信息： https://www.geeksforgeeks.org/flutter-custom-bottom-navigation-bar/