Turn on/off Flashlight to Make a Torch App in React Native

React Native Torch

This is an Example to Turn on/off Flashlight to Make a Torch App in React Native. To Turn on/off the Flashlight in React Native we will use the react-native-torch library.

In this example, we will make a simple screen with a button to turn on the flashlight. So let’s get started.

Turn On the Flashlight using

Torch.switchState(true);

Turn Off the Flashlight using

Torch.switchState(false);

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react native command line interface to make our React Native App.

If you have previously installed a global react-native-cli package, please remove it as it may cause unexpected issues:

npm uninstall -g react-native-cli @react-native-community/cli

Run the following commands to create a new React Native project

npx react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

npx react-native init ProjectName --version X.XX.X

Note If the above command is failing, you may have old version of react-native or react-native-cli installed globally on your pc. Try uninstalling the cli and run the cli using npx.

This will make a project structure with an index file named App.js in your project directory.

Installation of Dependency

To use Torch we need to install react-native-torch dependency.

To install this open the terminal and jump into your project using

cd ProjectName

Run the following command to install

npm install react-native-torch --save

This command will copy all the dependencies into your node_module directory. –save is optional, it is just to update the react-native-torch dependency in your package.json file.

CocoaPods Installation

Please use the following command to install CocoaPods

npx pod-install

Code

Now Open App.js in any code editor and replace the code with the following code.

App.js

// Turn on/off Flashlight to Make a Torch App in React Native
// https://aboutreact.com/turn-on-off-flashlight-to-make-a-torch-app-in-react-native/

// import React in our code
import React, {useState} from 'react';

// import all the components we are going to use
import {
  SafeAreaView,
  StyleSheet,
  Text,
  View,
  TouchableOpacity,
} from 'react-native';

// import Torch Component
import Torch from 'react-native-torch';

const App = () => {
  //Default Keep Awake off
  const [isTorchOn, setIsTorchOn] = useState(false);

  const handlePress = () => {
    Torch.switchState(!isTorchOn);
    setIsTorchOn(!isTorchOn);
  };

  return (
    <SafeAreaView style={styles.container}>
      <View>
        <Text style={styles.titleText}>
          Turn on/off Flashlight to Make a Torch App in React Native
        </Text>
        <TouchableOpacity
          activeOpacity={0.7}
          style={styles.buttonStyle}
          onPress={handlePress}>
          <Text style={styles.buttonTextStyle}>
            {isTorchOn ? 'Turn off the Torch' : 'Turn on the Torch'}
          </Text>
        </TouchableOpacity>
      </View>
    </SafeAreaView>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'white',
    padding: 10,
    justifyContent: 'center',
  },
  titleText: {
    fontSize: 22,
    textAlign: 'center',
    fontWeight: 'bold',
  },
  buttonStyle: {
    justifyContent: 'center',
    marginTop: 15,
    padding: 10,
    backgroundColor: '#8ad24e',
    marginRight: 2,
    marginLeft: 2,
  },
  buttonTextStyle: {
    color: '#fff',
    textAlign: 'center',
  },
});

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

1. Start Metro Bundler

First, you will need to start Metro, the JavaScript bundler that ships with React Native. To start Metro bundler run following command:

npx react-native start

Once you start Metro Bundler it will run forever on your terminal until you close it. Let Metro Bundler run in its own terminal. Open a new terminal and run the application.

2. Start React Native Application

To run the project on an Android Virtual Device or on real debugging device:

npx react-native run-android

or on the iOS Simulator by running (macOS only)

npx react-native run-ios

Output Screenshots

IOS

Android

This is how you can Turn on/off Flashlight to Make a Torch App in React Native. If you have any doubts or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!

Hope you liked it. 🙂