Flutter Mobile Development · Lección

TabBars y Drawers

Implemente patrones de navegación habituales, como TabBars para varias vistas y Drawers para menús de navegación lateral.

TabBars y Drawers es una lección gratuita de Flutter Mobile Development en CoddyKit. Esta es la lección 3 de 4. Puedes leer la lección completa abajo gratuitamente — luego la practicas en el navegador con un editor de código integrado y un tutor de IA 24/7. Forma parte de la ruta de aprendizaje de Flutter Mobile Development, y tu progreso se sincroniza en la web y la app de CoddyKit. El curso de Flutter Mobile Development incluye 4 lecciones en total.

Partes de esta lección aún no han sido traducidas y se muestran en inglés.

Intro to Navigation Patterns

Flutter offers powerful patterns for app navigation. Today, we explore two common ones: TabBars and Drawers.

These widgets help users navigate between different sections of your app smoothly and intuitively.

TabBars are great for switching between related views.
Drawers provide a side menu for global navigation or settings.

What are TabBars?

A TabBar is a horizontal row of tabs, often found at the top or bottom of a screen. Each tab represents a different view or category of content.

When a user taps a tab, the content below it changes without leaving the current screen.

Building a Basic TabBar

To use tabs, you often wrap your Scaffold with a DefaultTabController. This controller manages the selected tab.

Then, place a TabBar widget inside your AppBar's bottom property or as a BottomNavigationBar.

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 3, // Number of tabs
        child: Scaffold(
          appBar: AppBar(
            title: const Text('My Tab App'),
            bottom: const TabBar(
              tabs: [
                Tab(icon: Icon(Icons.home), text: 'Home'),
                Tab(icon: Icon(Icons.settings), text: 'Settings'),
                Tab(icon: Icon(Icons.info), text: 'Info'),
              ],
            ),
          ),
          body: const TabBarView(
            children: [
              Center(child: Text('Home Content')),
              Center(child: Text('Settings Content')),
              Center(child: Text('Info Content')),
            ],
          ),
        ),
      ),
    );
  }
}

TabBarView in Action

The TabBarView widget works hand-in-hand with TabBar. It displays the content corresponding to the currently selected tab.

Make sure the number of children in TabBarView matches the length of your DefaultTabController and the number of Tab widgets.

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 3, // Must match the number of tabs
        child: Scaffold(
          appBar: AppBar(
            title: const Text('Tab Views'),
            bottom: const TabBar(
              tabs: [
                Tab(text: 'Explore'),
                Tab(text: 'Favorites'),
                Tab(text: 'Profile'),
              ],
            ),
          ),
          body: TabBarView( // Content for each tab
            children: [
              Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: const [
                    Icon(Icons.explore, size: 80, color: Colors.blue),
                    Text('Explore new content!', style: TextStyle(fontSize: 20)),
                  ],
                ),
              ),
              Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: const [
                    Icon(Icons.favorite, size: 80, color: Colors.red),
                    Text('Your favorite items.', style: TextStyle(fontSize: 20)),
                  ],
                ),
              ),
              Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: const [
                    Icon(Icons.person, size: 80, color: Colors.green),
                    Text('Your user profile.', style: TextStyle(fontSize: 20)),
                  ],
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

Styling Your Tabs

You can customize the look of your TabBar. For example, change colors, indicator styles, or label styles.

The indicatorColor and labelColor properties are common ways to match your app's theme.

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 2,
        child: Scaffold(
          appBar: AppBar(
            title: const Text('Custom Tabs'),
            bottom: TabBar(
              indicatorColor: Colors.yellowAccent, // Custom indicator color
              labelColor: Colors.white,            // Color for selected tab
              unselectedLabelColor: Colors.grey[400], // Color for unselected tabs
              tabs: const [
                Tab(icon: Icon(Icons.call), text: 'Calls'),
                Tab(icon: Icon(Icons.chat), text: 'Chats'),
              ],
            ),
          ),
          body: const TabBarView(
            children: [
              Center(child: Text('Calls Log')),
              Center(child: Text('Chat Messages')),
            ],
          ),
        ),
      ),
    );
  }
}

What is a Drawer?

A Drawer is a panel that slides out from the side of the screen, typically from the left. It's often used for main navigation links or global settings.

Drawers are perfect for apps with many sections that don't fit into a TabBar or BottomNavigationBar.

Adding a Side Drawer

To add a drawer, simply include a Drawer widget as a child of your Scaffold. Flutter automatically adds a menu icon to your AppBar.

Inside the Drawer, you'll typically use a ListView to hold multiple ListTile widgets, representing navigation items.

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('My Drawer App'),
        ),
        drawer: Drawer( // The Drawer widget
          child: ListView(
            padding: EdgeInsets.zero, // Remove padding
            children: <Widget>[
              const DrawerHeader( // Top part of the drawer
                decoration: BoxDecoration(
                  color: Colors.blue,
                ),
                child: Text(
                  'App Menu',
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: 24,
                  ),
                ),
              ),
              ListTile( // A navigation item
                leading: const Icon(Icons.message),
                title: const Text('Messages'),
                onTap: () {
                  // Handle tap
                  Navigator.pop(context); // Close the drawer
                },
              ),
              ListTile(
                leading: const Icon(Icons.account_circle),
                title: const Text('Profile'),
                onTap: () {
                  // Handle tap
                  Navigator.pop(context);
                },
              ),
              ListTile(
                leading: const Icon(Icons.settings),
                title: const Text('Settings'),
                onTap: () {
                  // Handle tap
                  Navigator.pop(context);
                },
              ),
            ],
          ),
        ),
        body: const Center(
          child: Text('Pull from left to open drawer!'),
        ),
      ),
    );
  }
}

Handling Drawer Taps

When a user taps an item in the drawer, you usually want to perform an action, like navigating to a new screen or updating content.

Remember to call Navigator.pop(context) after an item is tapped to close the drawer, providing a smooth user experience.

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Drawer Actions'),
        ),
        drawer: Drawer(
          child: ListView(
            padding: EdgeInsets.zero,
            children: <Widget>[
              const DrawerHeader(
                decoration: BoxDecoration(color: Colors.green),
                child: Text('Navigation', style: TextStyle(color: Colors.white)),
              ),
              ListTile(
                leading: const Icon(Icons.home),
                title: const Text('Go Home'),
                onTap: () {
                  // Close drawer, then navigate (or just close if already on home)
                  Navigator.pop(context);
                  // Example: Navigator.push(context, MaterialPageRoute(builder: (context) => HomeScreen()));
                },
              ),
              ListTile(
                leading: const Icon(Icons.bookmark),
                title: const Text('View Bookmarks'),
                onTap: () {
                  Navigator.pop(context); // Close drawer
                  // Show a snackbar as an example action
                  ScaffoldMessenger.of(context).showSnackBar(
                    const SnackBar(content: Text('Viewing Bookmarks!'))
                  );
                },
              ),
            ],
          ),
        ),
        body: const Center(
          child: Text('Try opening the drawer and tapping an item.'),
        ),
      ),
    );
  }
}

Customizing Your Drawer

Drawers can be highly customized. You can add user profile info, app version, or even search bars.

Use UserAccountsDrawerHeader for a pre-built header with user info.
Keep the number of items manageable to avoid clutter.
Group related items logically using dividers.

TabBar vs. Drawer

Which of the following scenarios is best suited for using a Flutter TabBar?

TabBars & Drawers Recap

Great job! You've learned how to implement two essential navigation patterns:

TabBars for switching between related views using DefaultTabController, TabBar, and TabBarView.
Drawers for side navigation menus using the Drawer widget and ListTiles.

Choose the right pattern based on your app's complexity and user flow. Keep exploring to build more intuitive UIs!

Preguntas frecuentes

¿La lección «TabBars y Drawers» es gratis?

Sí — el texto completo de «TabBars y Drawers» es gratis para leer aquí en la web. Para practicarla de forma interactiva (editor de código integrado y tutor de IA 24/7) y desbloquear el resto del curso de Flutter Mobile Development, actualiza a CoddyKit PRO. El curso de Flutter Mobile Development incluye 4 lecciones en total.

¿Qué aprenderé en «TabBars y Drawers»?

Implemente patrones de navegación habituales, como TabBars para varias vistas y Drawers para menús de navegación lateral. Practicas Flutter Mobile Development con código real que ejecutas directamente en el navegador, y un tutor de IA 24/7 responde tus preguntas mientras trabajas en la lección.

¿Necesito experiencia previa para empezar Flutter Mobile Development?

No se requiere experiencia previa. Flutter Mobile Development en CoddyKit está estructurado para principiantes hasta estudiantes avanzados, así que puedes empezar aquí o desde el inicio y avanzar a tu ritmo. Esta es la lección 3 de 4.

¿Cuánto tiempo toma la lección «TabBars y Drawers»?

La mayoría de las lecciones de CoddyKit toman alrededor de 5–10 minutos. Cada una es compacta e interactiva, así que avanzas constantemente y retomas exactamente por donde dejaste en la web y la app.

¿Puedo escribir y ejecutar código en esta lección de Flutter Mobile Development?

Sí. Cada lección de Flutter Mobile Development incluye un editor de código integrado, así que escribes y ejecutas código real directamente en tu navegador y obtienes retroalimentación instantánea de IA — sin configuración local necesaria.

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