ملاح علامات التبويب السفلية

A bottom tab navigator renders a tab bar at the bottom of the screen with one tab per registered screen. Tapping a tab switches to that screen. This pattern is very common in mobile apps (Instagram, Twitter, Airbnb) and is provided by the @react-navigation/bottom-tabs package.

Install the bottom tabs navigator package separately from the React Navigation core. If you are using Expo, also make sure react-native-screens and react-native-safe-area-context are already installed from the previous setup step.

Call createBottomTabNavigator() to get a Tab object with Tab.Navigator and Tab.Screen components. Register screens exactly as you would in a stack navigator. Each Tab.Screen name becomes the default tab label.

Each tab should have an icon to help users recognize it quickly. Use tabBarIcon inside the screen's options prop. The render function receives a focused boolean and a color so you can render different icons or colors for active vs inactive tabs.

Set tabBarActiveTintColor and tabBarInactiveTintColor in screenOptions to control the color of tab icons and labels for the selected and unselected states. These color values are passed into the tabBarIcon render function automatically.

Sometimes you want to hide the tab bar when navigating to a detail screen. Set tabBarStyle: { display: 'none' } in the screen's options or use the navigation prop to toggle it dynamically with navigation.setOptions.

Override the tab label with tabBarLabel in the screen options. Add a notification badge using tabBarBadge to show a count indicator on the icon — useful for messaging or notification tabs. Set tabBarBadge to a number or string.

Customize the tab bar background color and border using tabBarStyle in screenOptions. You can set backgroundColor, borderTopColor, elevation (Android shadow), and height to match your design system.

Use navigation.navigate('TabName') to switch to a specific tab from any screen within the navigator. This is useful when a button action in one tab should take the user to another section of the app. The active tab's state is preserved.

Use the tabPress event on navigation to intercept a tab press. This is useful for scrolling a list back to the top when the user taps the active tab. Call e.preventDefault() if you want to handle the press yourself without the default navigation action.

In real apps each tab often contains its own stack of screens. Simply nest a Stack.Navigator as the component for a Tab.Screen. The stack renders inside the tab area while the tab bar remains visible at the bottom of the screen.

Test your understanding of Bottom Tab Navigator concepts from this lesson.

In this lesson you learned: install and create a bottom tab navigator with createBottomTabNavigator, add icons using tabBarIcon in screen options, and customize colors, labels, and badges globally via screenOptions. Next up we explore the Drawer Navigator and nested navigators.