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FastImage example app.

React Native'sImage component handles image caching like browsersfor the most part.If the server is returning proper cache controlheaders for images you'll generally get the sort of built incaching behavior you'd have in a browser.Even so many people have noticed:

• Flickering.
• Cache misses.
• Low performance loading from cache.
• Low performance in general.

FastImage is anImage replacement that solves these issues.FastImage is a wrapper aroundSDWebImage (iOS)andGlide (Android).

• Aggressively cache images.
• Add authorization headers.
• Prioritize images.
• Preload images.
• GIF support.
• Border radius.

Note: You must be using React Native 0.60.0 or higher to use the most recent version ofreact-native-fast-image.

yarn add react-native-fast-imagecd ios&& pod install

importFastImagefrom'react-native-fast-image'constYourImage=()=>(<FastImagestyle={{width:200,height:200}}source={{uri:'https://unsplash.it/400/400?image=1',headers:{Authorization:'someAuthToken'},priority:FastImage.priority.normal,}}resizeMode={FastImage.resizeMode.contain}/>)

• Are you using Glide already using an AppGlideModule? (you might have problems if you don't read this)

If you use Proguard you will need to add these lines toandroid/app/proguard-rules.pro:

-keep public class com.dylanvann.fastimage.* {*;}-keep public class com.dylanvann.fastimage.** {*;}-keep public class * implements com.bumptech.glide.module.GlideModule-keep public class * extends com.bumptech.glide.module.AppGlideModule-keep public enum com.bumptech.glide.load.ImageHeaderParser$** {  **[] $VALUES;  public *;}

Source for the remote image to load.

Remote url to load the image from. e.g.'https://facebook.github.io/react/img/logo_og.png'.

Headers to load the image with. e.g.{ Authorization: 'someAuthToken' }.

• FastImage.priority.low - Low Priority.
• FastImage.priority.normal(Default) - Normal Priority.
• FastImage.priority.high - High Priority.

• FastImage.cacheControl.immutable -(Default) - Only updates if url changes.
• FastImage.cacheControl.web - Use headers and follow normal caching procedures.
• FastImage.cacheControl.cacheOnly - Only show images from cache, do not make any network requests.

• An asset loaded withrequire(...).
• Note that like the built-inImage implementation, on AndroiddefaultSource does not work in debug mode. This is due to the fact that assets are sent from the dev server, but RN's functions only know how to load it fromres.

• FastImage.resizeMode.contain - Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or less than the corresponding dimension of the view (minus padding).
• FastImage.resizeMode.cover(Default) - Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding).
• FastImage.resizeMode.stretch - Scale width and height independently, This may change the aspect ratio of the src.
• FastImage.resizeMode.center - Do not scale the image, keep centered.

Called when the image starts to load.

Called when the image is loading.

e.g.onProgress={e => console.log(e.nativeEvent.loaded / e.nativeEvent.total)}

Called on a successful image fetch. Called with the width and height of the loaded image.

e.g.onLoad={e => console.log(e.nativeEvent.width, e.nativeEvent.height)}

Called on an image fetching error.

Called when the image finishes loading, whether it was successful or an error.

A React Native style. Supports usingborderRadius.

If true will fallback to usingImage.In this case the image will still be styled and laid out the same way asFastImage.

If supplied, changes the color of all the non-transparent pixels to the given color.

Preload images to display later. e.g.

FastImage.preload([{uri:'https://facebook.github.io/react/img/logo_og.png',headers:{Authorization:'someAuthToken'},},{uri:'https://facebook.github.io/react/img/logo_og.png',headers:{Authorization:'someAuthToken'},},])

Clear all images from memory cache.

Clear all images from disk cache.

If you have any problems using this library try the steps introubleshooting and see if they fix it.

Follow these instructions to get the example app running.

This project only aims to support the latest version of React Native.
This simplifies the development and the testing of the project.

If you require new features or bug fixes for older versions you can fork this project.

The idea for this modules came fromvovkasm'sreact-native-web-imagepackage.It also uses Glide and SDWebImage, but didn't have some features I needed (priority, headers).

Thanks to@mobinni for helping with the conceptualization

• FastImage - MIT ©DylanVann
• SDWebImage -MIT
• Glide - BSD, part MIT and Apache 2.0. See theLICENSE file for details.