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 init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run

npm install -g react-native-cli

Run the following commands to create a new React Native project

react-native init ProjectName

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

react-native init ProjectName --version X.XX.X
react-native init ProjectName --version react-native@next

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 dependency 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

After the updation of React Native 0.60, they have introduced autolinking so we do not require to link the library but need to install pods. So to install pods use

cd ios && pod install && cd ..

Code

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

App.js

/*Example to Turn on Flashlight to Make a Torch App in React Native*/
import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View,Button} from 'react-native';
import Torch from 'react-native-torch';
export default class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      isTorchOn: false,
    };
  }
  _handlePress() {
    const { isTorchOn } = this.state;
    Torch.switchState(!isTorchOn);
    this.setState({ isTorchOn: !isTorchOn });
  }
  render() {
    return (
      <View style={styles.container}>
      <Text style={styles.welcome}>
          Torch / Flash Light Demo
        </Text>
        <Button
          onPress={this._handlePress.bind(this)}
          title={this.state.isTorchOn ? "Turn off the Torch":"Turn on the Torch"}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

To Run the React Native App

Open the terminal again and jump into your project using.
cd ProjectName
To run the project on an Android Virtual Device or on real debugging device
react-native run-android
or on the iOS Simulator by running
react-native run-ios (macOS only).

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. 🙂


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