🚀 BlastedImage

A simple yet powerful image component for React Native, powered by Glide (Android) and SDWebImage (iOS).

Description

Caching remote images has always been a challenge for me with the Image component in React Native. This simplified, yet powerful component, addresses that issue head-on. It offers a robust and performant mechanism for caching remote images, ensuring they're displayed quickly.

Leveraging the strengths of Glide and SDWebImage, it supports both memory and disk caching for remote images. The newly added Hybrid Assets feature allows you to bundle remote assets in your build, fetching from the network only when necessary. Notably, while it provides these enhanced capabilities for remote images, it seamlessly integrates with the standard React Native Image component when handling local assets using require.

Features

• Performance: Bypasses the React Native Image component for remote images ensuring immediate and lightning-fast display of remote images.
• Cross-Platform: Works on both Android (with Glide) and iOS (with SDWebImage)
• Customizable: Wrapped within a View for added layout and style customization.
• Robust Caching: Benefits from both memory and disk caching for maximum performance.
• Hybrid Assets: Bundle remote assets within your build and only fetch from the network if assets are not included.

Installation

With bare React Native

Using npm:

npm install react-native-blasted-image --save

Using yarn:

yarn add react-native-blasted-image

Link native packages (iOS only)

cd ios && pod install

With Expo

Using npm:

npx expo install react-native-blasted-image

Usage

Here's a simple example to get you started:

import BlastedImage from 'react-native-blasted-image';

<BlastedImage 
  source={{ uri: 'https://example.com/image.png' }} 
  resizeMode="cover"
  width={200}
  height={200}
  style={{ borderRadius: 10 }}
/>

Paramaters

Parameter	Type	Description	Default
source	Object or require	(Required) Can be an object containing a uri string for remote images or local images using require. (Optional) The object containing uri can also contain hybridAssets and cloudUrl . See specific documentation regarding the source parameter below.	-
width	Number	(Optional) Specifies the width of the image. Overrides width in style	100
height	Number	(Optional) Specifies the height of the image. Overrides height in style	100
resizeMode	String	(Optional) Resize the image with one of the options: cover contain center stretch	cover
isBackground	Boolean	(Optional) Makes the image act as a container background similar to the native ImageBackground component	false
fallbackSource	Object	(Optional) Object containing a uri string for a custom error image.	-
onLoad	Function	(Optional) Callback function that gets called when the image has loaded succesfully.	-
onError	Function	(Optional) Callback function that gets called when there was an error loading the image.	-
style	Object	(Optional) Styles to be applied to the image, e.g., {borderRadius:20}. See View Style Props for all available styles.

Source Parameter

Parameter	Type	Description	Default
uri	String	(Required) URI string for remote images or local images using require.	-
hybridAssets	Boolean	(Optional) Enables the Hybrid Assets feature to bundle remote assets locally and fetch from the network if not included.	false
cloudUrl	String	(Optional) Leading URL to the remote assets for Hybrid Assets functionality. (Required if hybridAssets is enabled)	null

Methods

import BlastedImage from 'react-native-blasted-image';

BlastedImage.preload([
  { uri: 'https://example.com/image1.jpg' },
  { uri: 'https://example.com/image2.jpg', skipMemoryCache: true },
  { uri: 'https://example.com/image2.jpg', skipMemoryCache: true, hybridAssets: true, cloudUrl: "https://www.example.com/" }
]);

Method	PropType	Description
BlastedImage.preload()	Array<{ uri: string, skipMemoryCache: bool, hybridAssets: bool, cloudUrl: string }>	Preloads remote images from an array of URIs, with the option to preload only to disk.
BlastedImage.clearDiskCache()	-	Clears the disk cache for all images.
BlastedImage.clearMemoryCache()	-	Clears the memory cache for all images.
BlastedImage.clearAllCaches()	-	Clears both disk and memory caches for all images.

Hybrid Assets

The Hybrid Assets feature allows you to bundle remote assets directly into your build ensuring they are available locally while still enabling network fetching when necessary. This approach can significantly reduce bandwidth usage especially if you know in advance which assets will be used when you bundle your app.

To fully utilize the Hybrid Assets feature it's important to follow the same folder structure remotely as you do locally. This makes it easier to update your project with new assets while keeping everything organized and simplify the process of integrating updates.

Automatic Bundling (Expo only)

When using Expo you can take advantage of the automatic asset bundling feature by adding this to your app.json file and running prebuild. The bundling feature will automatically copy and reference hybrid assets from the ./assets/blasted-image/* directory on both iOS and Android platforms following the same folder structure as your remote assets.

app.json

{
  "expo": {
    "plugins": [
      "react-native-blasted-image",
      {
        "assetsPath": "/project-root/assets/blasted-image"
      }
    ]
  }
}

Note: The assetsPath property is optional. By default, it will use the path ./assets/blasted-image

Run

npx expo prebuild

Manual Bundling

If you prefer to manage your hybrid assets manually or if you are using Bare React Native you need to do the following.

Android

1. Copy your hybrid assets to ./android/app/src/main/assets/blasted-image/

iOS

1. Copy your hybrid assets to ./ios/Resources/blasted-image/
2. Reference your hybrid asset folder in Xcode (Resources -> blasted-image) and make sure it is included in the Build Phase.

Hybrid Assets Example Structure

Local files                         # Files included in your build
│
├── assets                          # Inside root directory of your project
│   │
│   ├── blasted-image               # All images in this folder are checked against the matching location on your cloud storage.
│   │
│   ├────── image_or_folder_1	 
│   ├────── image_or_folder_2        
│   └────── ...    
└── ...
	
Remote files                        # Files in the cloud, for example Firebase etc.
│
├── image_or_folder_1               # Available in hybrid assets, not downloaded
├── image_or_folder_2               # Available in hybrid assets, not downloaded
├── image_or_folder_2               # Not available in hybrid assets, download and cache
└── ...

Note: If you use manual bundling your hybrid assets should not be placed inside the root of your project directory but rather in Resources for iOS and assets for Android.

Events

import { NativeEventEmitter, NativeModules } from 'react-native';

const BlastedImageEvents = new NativeEventEmitter(NativeModules.BlastedImage);

useEffect(() => {
  const subscription = BlastedImageEvents.addListener('BlastedEventLoaded', (data) => {
    console.log(data.message);
  });

  return () => {
    subscription.remove();
  };
}, []);

Event	Description
BlastedEventLoaded	Triggered when remote images are successfully loaded.
BlastedEventClearedMemory	Triggered when the memory cache for all images is cleared.
BlastedEventClearedDisk	Triggered when the disk cache for all images is cleared.
BlastedEventClearedAll	Triggered when both disk and memory caches for all images are cleared.
BlastedEventLog	Provides detailed logging information for better debugging.

Credits

This component was created with inspiration from react-native-fast-image that also uses Glide and SDWebImage. But due to its lack of ongoing maintenance i felt the need to develop this new image component to continue providing robust and performant caching functionality.

Contributing

Contributions are welcome! If you find a bug or have a feature request, please open an issue. If you want to contribute code, please open a pull request.

License

• BlastedImage - MIT ©️ xerdnu
• SDWebImage - MIT
• Glide - BSD, part MIT and Apache 2.0. See the LICENSE file for details.