Add navigation

Add a new screen to the stack

Let's create a new file named about.tsx inside the app directory. It displays the screen name when the user navigates to the /about route.

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

export default function AboutScreen() {
  return (
    <View style={styles.container}>
      <Text style={styles.text}>About screen</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#25292e',
    justifyContent: 'center',
    alignItems: 'center',
  },
  text: {
    color: '#fff',
  },
});

Inside _layout.tsx:

1. Add a <Stack.Screen /> component and an options prop to update the title of the /about route.
2. Update the /index route's title to Home by adding options prop.

import { Stack } from 'expo-router';

export default function RootLayout() {
  return (
    <Stack>
      <Stack.Screen name="index" options={{ title: 'Home' }} />
      <Stack.Screen name="about" options={{ title: 'About' }} />
    </Stack>
  );
}

Navigate between screens

We'll use Expo Router's Link component to navigate from the /index route to the /about route. It is a React component that renders a <Text> with a given href prop.

1. Import the Link component from expo-router inside index.tsx.
2. Add a Link component after <Text> component and pass href prop with the /about route.
3. Add a style of fontSize, textDecorationLine, and color to Link component. It takes the same props as the <Text> component.

import { Text, View, StyleSheet } from 'react-native';
import { Link } from 'expo-router';

export default function Index() {
  return (
    <View style={styles.container}>
      <Text style={styles.text}>Home screen</Text>
      <Link href="/about" style={styles.button}>
        Go to About screen
      </Link>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#25292e',
    alignItems: 'center',
    justifyContent: 'center',
  },
  text: {
    color: '#fff',
  },
  button: {
    fontSize: 20,
    textDecorationLine: 'underline',
    color: '#fff',
  },
});

Let's took a look at the changes in our app. Click on Link to navigate to the /about route:

Add a not-found route

When a route doesn't exist, we can use a +not-found route to display a fallback screen. This is useful when we want to display a custom screen when navigating to an invalid route on mobile instead of crashing the app or display a 404 error on web. Expo Router uses a special +not-found.tsx file to handle this case.

1. Create a new file named +not-found.tsx inside the app directory to add the NotFoundScreen component.
2. Add options prop from the Stack.Screen to display a custom screen title for this route.
3. Add a Link component to navigate to the / route, which is our fallback route.

import { View, StyleSheet } from 'react-native';
import { Link, Stack } from 'expo-router';

export default function NotFoundScreen() {
  return (
    <>
      <Stack.Screen options={{ title: 'Oops! Not Found' }} />
      <View style={styles.container}>
        <Link href="/" style={styles.button}>
          Go back to Home screen!
        </Link>
      </View>
    </>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#25292e',
    justifyContent: 'center',
    alignItems: 'center',
  },

  button: {
    fontSize: 20,
    textDecorationLine: 'underline',
    color: '#fff',
  },
});

To test this, navigate to http:localhost:8081/123 URL in the web browser since it is easy to change the URL path there. The app should display the NotFoundScreen component:

Add a bottom tab navigator

At this point, the file structure of our app directory looks like the following:

We'll add a bottom tab navigator to our app and reuse the existing Home and About screens to create a tab layout (a common navigation pattern in many social media apps like X or BlueSky). We'll also use the stack navigator in the Root layout so the +not-found route displays over any other nested navigators.

1. Inside the app directory, add a (tabs) subdirectory. This special directory is used to group routes together and display them in a bottom tab bar.
2. Create a (tabs)/_layout.tsx file inside the directory. It will be used to define the tab layout, which is separate from Root layout.
3. Move the existing index.tsx and about.tsx files inside the (tabs) directory. The structure of app directory will look like this:

Update the Root layout file to add a (tabs) route:

import { Stack } from 'expo-router';

export default function RootLayout() {
  return (
    <Stack>
      <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
      <Stack.Screen name="+not-found" />
    </Stack>
  );
}

Inside (tabs)/_layout.tsx, add a Tabs component to define the bottom tab layout:

import { Tabs } from 'expo-router';

export default function TabLayout() {
  return (
    <Tabs>
      <Tabs.Screen name="index" options={{ title: 'Home' }} />
      <Tabs.Screen name="about" options={{ title: 'About' }} />
    </Tabs>
  );
}

Let's take a look at our app now to see the new bottom tabs:

Update bottom tab navigator appearance

Right now, the bottom tab navigator looks the same on all platforms but doesn't match the style of our app. For example, the tab bar or header doesn't display a custom icon, and the bottom tab background color doesn't match the app's background color.

Modify the (tabs)/_layout.tsx file to add tab bar icons:

1. Import Ionicons icons set from @expo/vector-icons — a library that includes popular icon sets.
2. Add the tabBarIcon to both the index and about routes. This function takes focused and color as params and renders the icon component. From the icon set, we can provide custom icon names.
3. Add screenOptions.tabBarActiveTintColor to the Tabs component and set its value to #ffd33d. This will change the color of the tab bar icon and label when active.

import { Tabs } from 'expo-router';
import Ionicons from '@expo/vector-icons/Ionicons';

export default function TabLayout() {
  return (
    <Tabs
      screenOptions={{
        tabBarActiveTintColor: '#ffd33d',
      }}
    >
      <Tabs.Screen
        name="index"
        options={{
          title: 'Home',
          tabBarIcon: ({ color, focused }) => (
            <Ionicons name={focused ? 'home-sharp' : 'home-outline'} color={color} size={24} />
          ),
        }}
      />
      <Tabs.Screen
        name="about"
        options={{
          title: 'About',
          tabBarIcon: ({ color, focused }) => (
            <Ionicons name={focused ? 'information-circle' : 'information-circle-outline'} color={color} size={24}/>
          ),
        }}
      />
    </Tabs>
  );
}

Let's also change the background color of the tab bar and header using screenOptions prop:

<Tabs
  screenOptions={{
    tabBarActiveTintColor: '#ffd33d',
    headerStyle: {
      backgroundColor: '#25292e',
    },
    headerShadowVisible: false,
    headerTintColor: '#fff',
    tabBarStyle: {
    backgroundColor: '#25292e',
    },
  }}
>

In the above code:

• The header's background is set to #25292e using the headerStyle property. We have also disabled the header's shadow using headerShadowVisible.
• headerTintColor applies #fff to the header label
• tabBarStyle.backgroundColor applies #25292e to the tab bar

Our app now has a custom bottom tabs navigator: