如何在 flutter 中设计这个底部导航栏

Question

是否有任何可用的依赖项可以轻松设计此底部导航栏？

Answer 1

检查包animated_bottom_navigation_bar和curve_navigation_bar

Answer 2

您可以在没有任何外部 package 的情况下实现这一点，当然可以通过使用堆栈和几个容器来查看以下代码：

import 'package:flutter/cupertino.dart';
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: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Stack(
        children: [
          Column(
            mainAxisAlignment: MainAxisAlignment.end,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Row(
                crossAxisAlignment: CrossAxisAlignment.end,
                children: [
                  Expanded(
                    flex: 3,
                    child: Container(
                      height: 80.0,
                      decoration: BoxDecoration(
                        color: Colors.pink,
                        borderRadius: BorderRadius.only(
                          topLeft: Radius.circular(
                            30.0,
                          ),
                          topRight: Radius.circular(
                            15.0,
                          ),
                        ),
                      ),
                    ),
                  ),
                  Expanded(
                    flex: 2,
                    child: Container(
                      height: 60.0,
                      decoration: BoxDecoration(
                        color: Colors.pink,
                      ),
                    ),
                  ),
                  Expanded(
                    flex: 3,
                    child: Container(
                      height: 80.0,
                      decoration: BoxDecoration(
                        color: Colors.pink,
                        borderRadius: BorderRadius.only(
                          topLeft: Radius.circular(
                            15.0,
                          ),
                          topRight: Radius.circular(
                            30.0,
                          ),
                        ),
                      ),
                    ),
                  ),
                ],
              ),
            ],
          ),
          Padding(
            padding: EdgeInsets.only(
              bottom: 15.0,
            ),
            child: Align(
              alignment: Alignment.bottomCenter,
              child: Container(
                height: 90.0,
                width: 90.0,
                decoration: BoxDecoration(
                  color: Colors.black,
                  borderRadius: BorderRadius.circular(
                    45.0,
                  ),
                ),
              ),
            ),
          ),
          Padding(
            padding: EdgeInsets.only(
              bottom: 25.0,
            ),
            child: Align(
              alignment: Alignment.bottomCenter,
              child: Container(
                height: 70.0,
                width: 70.0,
                decoration: BoxDecoration(
                  color: Colors.pink,
                  borderRadius: BorderRadius.circular(
                    35.0,
                  ),
                ),
              ),
            ),
          ),
          Padding(
            padding: EdgeInsets.only(
              bottom: 30.0,
            ),
            child: Align(
              alignment: Alignment.bottomCenter,
              child: Container(
                height: 60.0,
                width: 60.0,
                decoration: BoxDecoration(
                  color: Colors.black,
                  borderRadius: BorderRadius.circular(
                    30.0,
                  ),
                ),
                child: Icon(
                  CupertinoIcons.home,
                  color: Colors.pink,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

代码 output

这是一个如何做的例子。 如果要实现订单和通知按钮等，可以将 Row() 中的第一个容器拆分为两个容器，稍微玩一下边距，可以很快实现这种设计。

请记住，还有其他数千种方法可以做到这一点，这取决于您对 flutter 小部件的了解程度。

希望这有帮助