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welcome to Infinitbility!

Today we are going to discuss how to manage dark mode without installing any package in react native with example.

I read many articles about managing dark mode applications in react-native but no one can explain without package. then I write custom code for managing dark mode without any package and sharing with you.

Step 1: Create Global Veriable

Create Global Veriable for manage themeMode on src\App.js

// App.js

/* App theme mode */
global.themeMode 	=	'light'; // light, dark

Step 2: Create a function

Create a function for get and set themeMode from Async Storage

// functions.js

// call when your app start
async getThemeMode(){
    let themeMode = await AsyncStorage.getItem("themeMode");
    if(themeMode) {
        global.themeMode  = themeMode;
        global.themeMode  = 'light';
        themeMode = 'light';
    return themeMode;

// call when user change theme mode
async setThemeMode(mode){
    let themeMode = await AsyncStorage.setItem("themeMode", mode);
    global.themeMode  = mode;
    return mode;

Step 3: Manage Styles file

create seprate const for differant styles on dark mode and light mode.

// Styles.js

// diffrent styles for modes
const ThemeStyle = {
    light: {
        background: {
            backgroundColor: '#FFFFFF'
    dark: {
        background: {
            backgroundColor: '#000000'

// home screen styles
const HomeScreenStyles = StyleSheet.create({
    // background
    content: {
        flex: 1,

Step 4: Manage styles on HomeScreen

Here you understand using styles for both mode

import React from 'react';
import { View, Text } from 'react-native';
import { HomeScreenStyles, ThemeStyle } from "../Styles";

export default class HomeScreen extends React.Component {
  constructor(props) {
    this.state = {
      loader: false,


  render() {
    return (
      <View style={[HomeScreenStyles.content, ThemeStyle[themeMode].background]}>
        <Text>Here Your Content</Text>


whenever user change themeMode update your any state such as loader and etc.

Thanks for reading…

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