react-native-asset-resize-to-base64

This react-native module allows you to get an asset image with CameraRoll (returns an url like this : "assets-library://asset/asset.JPG?id=ED7AC36B-A150-4C38-BB8C-B6D696F4F2ED&ext=JPG"), to resize and transform it to base64 string with NativeModules.RNAssetResizeToBase64.assetToResizedBase64 and then, to upload it with fetch. You can find an example to test it.

The function takes 3 arguments:

1. The assetUrl
2. The new width
3. The new Height

The function return 1 callback with 2 arguments:

1. err for errors
2. base64, the base64 string of the resized image

Installation (auto)

1. npm i react-native-asset-resize-to-base64 --save.
2. react-native link react-native-asset-resize-to-base64
3. Import in your file

import NativeModules from 'NativeModules'

1. Use it

NativeModules.RNAssetResizeToBase64.assetToResizedBase64(url, 500, 500, (err, base64) => console.log(base64))

IOS (manual)

• Open XCode
• In the XCode's "Project navigator", right click on your project's Libraries folder ➜ Add Files to <...>
• Go to node_modules/react-native-asset-resize-to-base64/ios/ and add RNAssetResizeToBase64.xcodeproj
• In the XCode's "Project navigator", select click on your project's name and add libRNAssetResizeToBase64.a under 'Link Binary with Libraries' in your project's 'Build Phases'

ANDROID (manual)

• In /android/settings.gradle, add this :

include ':react-native-asset-resize-to-base64'
project(':react-native-asset-resize-to-base64').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-asset-resize-to-base64/android')

• In /android/app/src/main/java/com//MainApplication.java, add this :

import RNAssetResizeToBase64.RNAssetResizeToBase64Package;
[...]
@Override
    protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
            new MainReactPackage(),
            new RNAssetResizeToBase64Package(),
            [...]
        );
    }

Example from scratch with access to the user gallery

1. react-native init example
2. cd example
3. npm i react-native-asset-resize-to-base64 --save
4. react-native link react-native-asset-resize-to-base64
5. add <You_app>/node_modules/react-native/Libraries/CameraRoll/RCTCameraRoll.xcodeproj to your project (in Xcode, <Your_app> in Libraries)
6. add libRCTCameraRoll.a (Xcode > Libraries > RCTCameraRoll.xcodeproj > Products > libRCTCameraRoll.a) to your project's Build Phases under "Link Binary With Libraries"
7. add, in Info.plist, the NSPhotoLibraryUsageDescription key with a string (why do you want to access the user gallery)