React Native 矢量图标不会显示在 Android 的底部选项卡导航中

Question

the icon shows in a screen/page, but won't show in the bottom navigation. Solutions that I've tried:

• Follow the installation guide from github , I've tried both the GRADLE & MANUAL options, but same result
• Have tried to ./gradlew clean then npx react-native run-android , but same result
• Have tried to npx react-native link react-native-vector-icons then npx react-native run-android , but same result

screenshot bottom nav bar

screenshot setting screen

It does appear in screen/page as shown in above screenshot, but won't show in the bottom navigation.

NOTE: I've tested both in emulator and real android device, but still got same result!

Code for the bottom tab

import React from 'react'
import { StyleSheet, Text, View } from 'react-native'
import Ionicons from 'react-native-vector-icons/Ionicons'
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs'
import ProductNavigation from './ProductNavigation'
import SettingScreen from '../screen/SettingScreen'



const BottomTab = createBottomTabNavigator();

const BottomTabNav = () => {
return (
    <BottomTab.Navigator>
        <BottomTab.Screen 
        name="Home" 
        component={ProductNavigation} 
        options={{
            tabBarLabel: "Home",
            tabBarIcon:({color, size}) => {
                <Ionicons name="home-outline" color={color} size={size} />
            }}} />

        <BottomTab.Screen 
        name="Settings" 
        component={SettingScreen}
        options={{
            tabBarLabel: "Settings",
            tabBarIcon: ({color, size}) => {
                <Ionicons name="settings-outline" color={color} size={size} 
    />
            
        }}} />
    </BottomTab.Navigator>
   )
  }

 export default BottomTabNav

 const styles = StyleSheet.create({})

Also can you help why does the bottom tab goes to the next page?? where should I edit the code, thanks in advance. Below is the Screenshot:

Answer 1

The issue is very simple actually, you are not returning anything from the function,

    tabBarIcon: ({color, size}) => {
//nothing returned here
                    <Ionicons name="settings-outline" color={color} size={size} 
        />

You have to do this, either use brackets like below or use the return statement to your code.

tabBarIcon: ({color, size}) => (
                <Ionicons name="settings-outline" color={color} size={size} 
    />)

Answer 2

First, make sure you use the icons correctly.

For example, suppose we use MaterialCommunityIcons .

import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';
const Tab = createBottomTabNavigator();
function MyTabs() {
  return (
    <Tab.Navigator
      initialRouteName="Home"
      tabBarOptions={{
        activeTintColor: '#e91e63',
      }}
    >
      <Tab.Screen
        name="Home"
        component={Home}
        options={{
          tabBarLabel: 'Home',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="home" color={color} size={size} />
          ),
        }}
      />
      <Tab.Screen
        name="Settings"
        component={Settings}
        options={{
          tabBarLabel: 'Updates',
          tabBarIcon: ({ color, size }) => (
            <MaterialCommunityIcons name="settings" color={color} size={size} />
          ),
          tabBarBadge: 3,
        }}
      />
    Tab.Navigator>
  );
}

General usage is like this. Check the document for details. https://reactnavigation.org/docs/bottom-tab-navigator/

Answer 3

In my case I hadn't added

apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"

to the android/app/build.gradle as indicated in the [Oblador React Native Vector Icons README document][1] [1]: https://github.com/oblador/react-native-vector-icons#android

Once I added that, my icons displayed.

Answer 4

You need to create a custom tab bar component, and add the icons there. React Navigation has a pretty good documentation - https://reactnavigation.org/docs/bottom-tab-navigator#tabbar