Last Updated on July 10, 2024
Quick Summary:
React Native is a popular framework for building mobile apps for Android and iOS platforms using a single codebase. One of the essential elements of mobile app development is images, and zooming functionality is a widely used feature for examining images in greater detail. In this tutorial, we will implement the pinch-to-zoom functionality for images in our React Native app using the React Native image zoom viewer library (“react-native-image-zoom-viewer”).
Table of Contents
Introduction
Incorporating image interactivity into mobile apps can be difficult, but the React Native Image Zoom Viewer offers streamlined solutions. It is a powerful tool that allows users to zoom and pan images quickly with smoothness and responsiveness, boosting the overall user experience. Also, its high performance can ensure consistent functionality across iOS and Android devices.
Moreover, the viewer is easily integrated and highly customizable, allowing your developers to craft the application’s unique style and requirements. In this blog, we will learn the image zoom functionality in the React Native application using the react-native modal, which will be scrollable through images.
Prerequisites
Before proceeding with this tutorial, you must have the following prerequisites:
- react-native-image-progress
- react-native-fast-image
- React-native-image-zoom-viewer
Step 1: Import Necessary Components From Libraries
Import the necessary components from the libraries mentioned above to implement the pinch-to-zoom image functionality. You can use the following code to import these components for React-Native-image zoom-viewer:
import ImageViewer from 'react-native-image-zoom-viewer';
import Modal from "react-native-modal";
import FastImage from "react-native-fast-image";
import { createImageProgress } from "react-native-image-progress";
Step 2: Using a Custom Image Component
To process the image and represent the loader while loading the image, you need to wrap the FastImage component with createImageProgress from the “react-native-image-progress” library. You can use the following code to wrap the FastImage component:
const Image = createImageProgress(FastImage)
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Step 3: Create ZoomModal Component
Now, you need to add a modal with ImageViewer from the React Native Image Zoom Viewer (react-native-image-zoom-viewer) library. For rendering the images, we have created a function called “renderImage,” which contains the custom FastImage component. For loading, we can use the ActivityIndicator component from the “react-native” library. You can use the following code for this:
const renderImage = ({ source, style }) => { return ( <Image source={{ uri: source?.uri, priority: 'high' }} style={style} resizeMode="contain" indicator={renderLoading} /> ) }
For Loading, we can use the below ActivityIndicator, which is from the React Native zoom image.
const renderLoading = () => { return (<ActivityIndicator color={'white'} size={'large'} />) }
UI Part for React Native Zoom Image
<Modal visible={visible} transparent={true}> <CrossIcon onPress={closeModal} /> <ImageViewer enablePreload={true} index={currentIndex} imageUrls={images} useNativeDriver={true} enableSwipeDown={false} renderImage={renderImage} loadingRender={renderLoading} saveToLocalByLongPress={false} /> </Modal>
Step 4: Use Zoom Modal in The App
Now that we have implemented the pinch-to-zoom functionality, you can use the zoom modal in the app. You can import the zoom image modal into the file where you want to achieve the pinch-to-zoom image functionality. You can use the following code for React Native image zoom:
<ZoomImageModal images={selectedImage} //Array of objects having URL of images isVisible={isVisible} //State for managing if the modal is open currentIndex={currentIndex} closeModal={closeZoomImageModal} // Function for closing modal />
Conclusion
This tutorial taught us how to implement zooming functionality for images in a React Native app using the React Native image zoom viewer library. By following the above steps, developers can provide a better user experience by allowing users to zoom in on images and examine them in greater detail. Hire React Native developer from us if you wish to build your RN multi-media app depicting image zoom and other functionalities.
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