Example of Grid Image Gallery in React Native

Introduction

Here is an Example of Grid Image Gallery in React Native. We will use FastImage component from react-native-fast-image for our Grid Image Gallery in React Native. If you have no idea about FastImage then you can get the idea about it from Fast Speed Image Loading using React Native Fast Image.

An image Gallery is the most common thing in an application. To make an Image gallery in React Native we have a number of options available and we are using one of them in this example. You can also see our other Example of Slider Image Gallery in React Native.

FastImage Component

<FastImage
  style={styles.image}
  source={{
    uri: 'https://unsplash.it/400/400?image=1',
    headers: { Authorization: '9876543210' },
  }}
/>

It is a very easy-to-use component. We are going to make a grid of images using Flat list (If you want to get an idea of how to do that then you can see Example of GridView using FlatList in React Native) and after clicking on the image from the grid view we are going to open it in modal component for the full view. So let’s get started.

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 FastImage component we need to install react-native-fast-image dependency.

To install these dependencies open the terminal and jump into your project using

cd ProjectName

Run the following commands

npm install react-native-fast-image --save

This command will copy all the dependencies into your node_module directory.

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

// Example of Grid Image Gallery in React Native
// https://aboutreact.com/grid-image-gallery/

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

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

//import FastImage
import FastImage from 'react-native-fast-image';

const App = () => {
  const [imageuri, setImageuri] = useState('');
  const [
    modalVisibleStatus, setModalVisibleStatus
  ] = useState(false);
  const [dataSource, setDataSource] = useState([]);

  useEffect(() => {
    let items = Array.apply(null, Array(120)).map((v, i) => {
      return {
        id: i,
        src: 'https://unsplash.it/400/400?image=' + (i + 1)
      };
    });
    setDataSource(items);
  }, []);

  const showModalFunction = (visible, imageURL) => {
    //handler to handle the click on image of Grid
    //and close button on modal
    setImageuri(imageURL);
    setModalVisibleStatus(visible);
  };

  return (
    <SafeAreaView style={styles.container}>
      {modalVisibleStatus ? (
        <Modal
          transparent={false}
          animationType={'fade'}
          visible={modalVisibleStatus}
          onRequestClose={() => {
            showModalFunction(!modalVisibleStatus, '');
          }}>
          <View style={styles.modelStyle}>
            <FastImage
              style={styles.fullImageStyle}
              source={{uri: imageuri}}
              resizeMode={
                FastImage.resizeMode.contain
              }
            />
            <TouchableOpacity
              activeOpacity={0.5}
              style={styles.closeButtonStyle}
              onPress={() => {
                showModalFunction(!modalVisibleStatus, '');
              }}>
              <FastImage
                source={{
                  uri:
                    'https://raw.githubusercontent.com/AboutReact/sampleresource/master/close.png',
                }}
                style={{width: 35, height: 35}}
              />
            </TouchableOpacity>
          </View>
        </Modal>
      ) : (
        <View style={styles.container}>
          <Text style={styles.titleStyle}>
            Grid Image Gallery in React Native
          </Text>
          <FlatList
            data={dataSource}
            renderItem={({item}) => (
              <View style={styles.imageContainerStyle}>
                <TouchableOpacity
                  key={item.id}
                  style={{flex: 1}}
                  onPress={() => {
                    showModalFunction(true, item.src);
                  }}>
                  <FastImage
                    style={styles.imageStyle}
                    source={{
                      uri: item.src,
                    }}
                  />
                </TouchableOpacity>
              </View>
            )}
            //Setting the number of column
            numColumns={3}
            keyExtractor={(item, index) => index.toString()}
          />
        </View>
      )}
    </SafeAreaView>
  );
};
export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#ffffff',
  },
  titleStyle: {
    padding: 16,
    fontSize: 20,
    color: 'white',
    backgroundColor: 'green',
  },
  imageContainerStyle: {
    flex: 1,
    flexDirection: 'column',
    margin: 1,
  },
  imageStyle: {
    height: 120,
    width: '100%',
  },
  fullImageStyle: {
    justifyContent: 'center',
    alignItems: 'center',
    height: '100%',
    width: '98%',
    resizeMode: 'contain',
  },
  modelStyle: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'rgba(0,0,0,0.4)',
  },
  closeButtonStyle: {
    width: 25,
    height: 25,
    top: 50,
    right: 20,
    position: 'absolute',
  },
});

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

This is how you can make Grid Image Gallery 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. 🙂