bottom-tab-navigator.md

id	bottom-tab-navigator
title	Bottom Tabs Navigator
sidebar_label	Bottom Tabs

A simple tab bar on the bottom of the screen that lets you switch between different routes. Routes are lazily initialized -- their screen components are not mounted until they are first focused.

To use this navigator, ensure that you have @react-navigation/native and its dependencies (follow this guide), then install @react-navigation/bottom-tabs:

npm install @react-navigation/bottom-tabs@^5.x

API Definition

To use this tab navigator, import it from @react-navigation/bottom-tabs:

import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';

const Tab = createBottomTabNavigator();

function MyTabs() {
  return (
    <Tab.Navigator>
      <Tab.Screen name="Home" component={HomeScreen} />
      <Tab.Screen name="Settings" component={SettingsScreen} />
    </Tab.Navigator>
  );
}

For a complete usage guide please visit Tab Navigation

Props

The Tab.Navigator component accepts following props:

initialRouteName

The name of the route to render on first load of the navigator.

screenOptions

Default options to use for the screens in the navigator.

backBehavior

How the going back behaves in the navigator, e.g. when goBack is called or device back button is pressed.

• initialRoute to return to initial tab
• order to return to previous tab (in the order they are shown in the tab bar)
• history to return to last visited tab
• none to not handle back button

lazy

Defaults to true. If false, all tabs are rendered immediately. When true, tabs are rendered only when they are made active for the first time. Note: tabs are not re-rendered upon subsequent visits.

detachInactiveScreens

Boolean used to indicate whether inactive screens should be detached from the view hierarchy to save memory. Make sure to call enableScreens from react-native-screens to make it work. Defaults to true.

sceneContainerStyle

Style object for the component wrapping the screen content.

tabBar

Function that returns a React element to display as the tab bar.

Example:

import { View, Text, TouchableOpacity } from 'react-native';

function MyTabBar({ state, descriptors, navigation }) {
  const focusedOptions = descriptors[state.routes[state.index].key].options;

  if (focusedOptions.tabBarVisible === false) {
    return null;
  }

  return (
    <View style={{ flexDirection: 'row' }}>
      {state.routes.map((route, index) => {
        const { options } = descriptors[route.key];
        const label =
          options.tabBarLabel !== undefined
            ? options.tabBarLabel
            : options.title !== undefined
            ? options.title
            : route.name;

        const isFocused = state.index === index;

        const onPress = () => {
          const event = navigation.emit({
            type: 'tabPress',
            target: route.key,
            canPreventDefault: true,
          });

          if (!isFocused && !event.defaultPrevented) {
            navigation.navigate(route.name);
          }
        };

        const onLongPress = () => {
          navigation.emit({
            type: 'tabLongPress',
            target: route.key,
          });
        };

        return (
          <TouchableOpacity
            accessibilityRole="button"
            accessibilityState={isFocused ? { selected: true } : {}}
            accessibilityLabel={options.tabBarAccessibilityLabel}
            testID={options.tabBarTestID}
            onPress={onPress}
            onLongPress={onLongPress}
            style={{ flex: 1 }}
          >
            <Text style={{ color: isFocused ? '#673ab7' : '#222' }}>
              {label}
            </Text>
          </TouchableOpacity>
        );
      })}
    </View>
  );
}

// ...

<Tab.Navigator tabBar={props => <MyTabBar {...props} />}>
  {...}
</Tab.Navigator>

This example will render a basic tab bar with labels.

Note that you cannot use the useNavigation hook inside the tabBar since useNavigation is only available inside screens. You get a navigation prop for your tabBar which you can use instead:

function MyTabBar({ navigation }) {
  return (
    <Button
      title="Go somewhere"
      onPress={() => {
        // Navigate using the `navigation` prop that you received
        navigation.navigate('SomeScreen');
      }}
    />
  );
}

tabBarOptions

An object containing the props for the default tab bar component. If you're using a custom tab bar, these will be passed as props to the tab bar and you can handle them.

It can contain the following properties:

activeTintColor

Label and icon color of the active tab item.

inactiveTintColor

Label and icon color of the inactive tab item.

activeBackgroundColor

Background color of the active tab item.

inactiveBackgroundColor

Background color of the inactive tab item.

tabStyle

Style object for the tab item.

showLabel

Whether to show label for tab, default is true.

labelStyle

Style object for the tab label text.

labelPosition

Whether the label is rendered below the icon or beside the icon. Possible values are:

• below-icon
• beside-icon

By default, in vertical orientation (portrait mode), label is rendered below the icon and in horizontal orientation (landscape mode)., it's rendered beside the icon.

adaptive

Should the tab icons and labels alignment change based on screen size? Defaults to true. If false, tab icons and labels align vertically all the time (labelPosition: 'below-icon'). When true, tab icons and labels align horizontally on tablets (labelPosition: 'beside-icon').

allowFontScaling

Whether label font should scale to respect Text Size accessibility settings, default is true.

keyboardHidesTabBar

Whether the tab bar is hidden when the keyboard opens. Defaults to false.

safeAreaInsets

Safe area insets for the screen. This is used to avoid elements like notch and system navigation bar. By default, the device's safe area insets are automatically detected. You can override the behavior with this option.

Takes an object containing following optional properties:

• top - number - The value of the top inset, e.g. area containing the status bar and notch.
• right - number - The value of the left inset.
• bottom - number - The value of the bottom inset, e.g. area navigation bar on bottom.
• left. - number - The value of the right inset.

style

Style object for the tab bar. You can configure styles such as background color here.

To show your screen under the tab bar, you can set the position style to absolute:

style: { position: 'absolute' }

You also might need to add a bottom margin to your content if you have a absolutely positioned tab bar. React Navigation won't do it automatically.

To get the height of the bottom tab bar, you can use BottomTabBarHeightContext with React's Context API or useBottomTabBarHeight:

import { BottomTabBarHeightContext } from '@react-navigation/bottom-tabs';

// ...

<BottomTabBarHeightContext.Consumer>
  {tabBarHeight => (
    /* render something */
  )}
</BottomTabBarHeightContext.Consumer>

or

import { useBottomTabBarHeight } from '@react-navigation/bottom-tabs';

// ...

const tabBarHeight = useBottomTabBarHeight();

Options

The following options can be used to configure the screens in the navigator:

title

Generic title that can be used as a fallback for headerTitle and tabBarLabel.

tabBarVisible

true or false to show or hide the tab bar, if not set then defaults to true.

Note: Hiding tab bar can cause glitches and jumpy behavior. We recommend the tab navigator inside of a stack navigator instead.

tabBarIcon

Function that given { focused: boolean, color: string, size: number } returns a React.Node, to display in the tab bar.

tabBarLabel

Title string of a tab displayed in the tab bar or a function that given { focused: boolean, color: string } returns a React.Node, to display in tab bar. When undefined, scene title is used. To hide, see tabBarOptions.showLabel in the previous section.

tabBarBadge

Text to show in a badge on the tab icon. Accepts a string or a number.

tabBarBadgeStyle

Style for the badge on the tab icon. You can specify a background color or text color here.

tabBarButton

Function which returns a React element to render as the tab bar button. It wraps the icon and label and implements onPress. Renders TouchableWithoutFeedback by default. tabBarButton: props => <TouchableOpacity {...props} /> would use TouchableOpacity instead.

tabBarAccessibilityLabel

Accessibility label for the tab button. This is read by the screen reader when the user taps the tab. It's recommended to set this if you don't have a label for the tab.

tabBarTestID

ID to locate this tab button in tests.

unmountOnBlur

Whether this screen should be unmounted when navigating away from it. Unmounting a screen resets any local state in the screen as well as state of nested navigators in the screen. Defaults to false.

Normally, we don't recommend enabling this prop as users don't expect their navigation history to be lost when switching tabs. If you enable this prop, please consider if this will actually provide a better experience for the user.

Events

The navigator can emit events on certain actions. Supported events are:

tabPress

This event is fired when the user presses the tab button for the current screen in the tab bar. By default a tab press does several things:

• If the tab is not focused, tab press will focus that tab
• If the tab is already focused:
  • If the screen for the tab renders a scroll view, you can use useScrollToTop to scroll it to top
  • If the screen for the tab renders a stack navigator, a popToTop action is performed on the stack

To prevent the default behavior, you can call event.preventDefault:

React.useEffect(() => {
  const unsubscribe = navigation.addListener('tabPress', (e) => {
    // Prevent default behavior
    e.preventDefault();

    // Do something manually
    // ...
  });

  return unsubscribe;
}, [navigation]);

If you have a custom tab bar, make sure to emit this event.

tabLongPress

This event is fired when the user presses the tab button for the current screen in the tab bar for an extended period. If you have a custom tab bar, make sure to emit this event.

Example:

React.useEffect(() => {
  const unsubscribe = navigation.addListener('tabLongPress', (e) => {
    // Do something
  });

  return unsubscribe;
}, [navigation]);

Helpers

The tab navigator adds the following methods to the navigation prop:

jumpTo

Navigates to an existing screen in the tab navigator. The method accepts following arguments:

• name - string - Name of the route to jump to.
• params - object - Screen params to merge into the destination route (found in the pushed screen through route.params).

navigation.jumpTo('Profile', { owner: 'Michaś' });

Example

import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';

const Tab = createBottomTabNavigator();

function MyTabs() {
  return (
    <Tab.Navigator
      initialRouteName="Feed"
      tabBarOptions={{
        activeTintColor: '#e91e63',
      }}
    >
      <Tab.Screen
        name="Feed"
        component={Feed}
        options={{
          tabBarLabel: 'Home',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="home" color={color} size={size} />
          ),
        }}
      />
      <Tab.Screen
        name="Notifications"
        component={Notifications}
        options={{
          tabBarLabel: 'Updates',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="bell" color={color} size={size} />
          ),
          tabBarBadge: 3,
        }}
      />
      <Tab.Screen
        name="Profile"
        component={Profile}
        options={{
          tabBarLabel: 'Profile',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="account" color={color} size={size} />
          ),
        }}
      />
    </Tab.Navigator>
  );
}