navigation 相关问题

我怎样才能制作这样的自定义导航栏？在此输入图像描述我已经尝试过这个在主页上类 CustomNavigationBar 扩展 StatelessWidget { 最终名单我怎样才能制作这样的自定义导航栏？在此输入图片描述我已经尝试过这个在主页上 class CustomNavigationBar extends StatelessWidget { final List<NavigationDestination> destinations; final int selectedIndex; final Function(int index) onDestinationSelected; const CustomNavigationBar({ Key? key, required this.destinations, required this.selectedIndex, required this.onDestinationSelected, }) : super(key: key); @override Widget build(BuildContext context) { return Container( color: Colors.green, // You can customize the background color height: 60, // Adjust the height as needed child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: List.generate( destinations.length, (index) => GestureDetector( onTap: () => onDestinationSelected(index), child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Icon( destinations[index].icon, color: index == selectedIndex ? Colors.white : Colors.black, ), if (destinations[index].label != null) Text( destinations[index].label!, style: TextStyle( color: index == selectedIndex ? Colors.white : Colors.black, ), ), ], ), ), ), ), ); } } 在主页上 final List<NavigationDestination> destinations = [ NavigationDestination(icon: Icons.home, label: 'Home'), NavigationDestination(icon: Icons.search, label: 'Search'), NavigationDestination(icon: Icons.shopping_cart, label: 'Cart'), ]; 我已经尝试过这个蛇形导航栏至少我需要任何帮助来了解我该如何做这个蛇形导航栏我已经尝试了很多，我读过它，但我绝对做不到尝试下面的代码： import 'package:flutter/material.dart'; class CustomNavigationBar extends StatelessWidget { final List<NavigationDestination> destinations; final int selectedIndex; final Function(int index) onDestinationSelected; const CustomNavigationBar({ super.key, required this.destinations, required this.selectedIndex, required this.onDestinationSelected, }); @override Widget build(BuildContext context) { return Container( margin: const EdgeInsets.all(8.0), padding: const EdgeInsets.symmetric(horizontal: 16.0), decoration: BoxDecoration( color: const Color(0xFF017620), borderRadius: BorderRadius.circular(30.0), ), height: 60.0, child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: List.generate( destinations.length, (index) { bool isSelected = index == selectedIndex; return GestureDetector( onTap: () => onDestinationSelected(index), child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Container( decoration: isSelected ? const BoxDecoration( color: Colors.white, shape: BoxShape.circle, ) : null, padding: EdgeInsets.all(isSelected ? 8.0 : 0.0), child: Icon( destinations[index].icon, color: isSelected ? Colors.green : Colors.white, ), ), ], ), ); }, ), ), ); } } class NavigationDestination { final IconData icon; final String? label; NavigationDestination({required this.icon, this.label}); } void main() { runApp(const MyApp()); } class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( bottomNavigationBar: CustomNavigationBar( destinations: [ NavigationDestination(icon: Icons.home, label: 'Home'), NavigationDestination(icon: Icons.note, label: 'Notes'), NavigationDestination( icon: Icons.calendar_today, label: 'Calendar'), NavigationDestination(icon: Icons.person, label: 'Profile'), ], selectedIndex: 0, onDestinationSelected: (index) { // todo: handle destination selection... }, ), body: const Center(child: Text('Content goes here')), ), ); } } 它会给你一个像附件一样的底部导航栏。

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