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@connected-home/react-native-fast-image
Advanced tools
🚩 FastImage, performant React Native image component.
FastImage example app.
React Native's Image
component handles image caching like browsers
for the most part.
If the server is returning proper cache control
headers for images you'll generally get the sort of built in
caching behavior you'd have in a browser.
Even so many people have noticed:
FastImage
is an Image
replacement that solves these issues.
FastImage
is a wrapper around
SDWebImage (iOS)
and
Glide (Android).
# Install
yarn add react-native-fast-image
# Automatic linking. (other linking methods listed below)
react-native link react-native-fast-image
import FastImage from 'react-native-fast-image'
const YourImage = () => (
<FastImage
style={styles.image}
source={{
uri: 'https://unsplash.it/400/400?image=1',
headers: { Authorization: 'someAuthToken' },
priority: FastImage.priority.normal,
}}
resizeMode={FastImage.resizeMode.contain}
/>
)
react-native link
)If you use Proguard you will need to add these lines to android/app/proguard-rules.pro
:
-keep public class com.dylanvann.fastimage.* {*;}
-keep public class com.dylanvann.fastimage.** {*;}
source?: object
Source for the remote image to load.
source.uri?: string
Remote url to load the image from. e.g. 'https://facebook.github.io/react/img/logo_og.png'
.
source.headers?: object
Headers to load the image with. e.g. { Authorization: 'someAuthToken' }
.
source.priority?: enum
FastImage.priority.low
- Low Priority.FastImage.priority.normal
(Default) - Normal Priority.FastImage.priority.high
- High Priority.source.cache?: enum
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.source.cacheOmitURLParams?: boolean
If true will be cached under url without query params Useful when image url is dynamic and query params contain security information
source.resize?: object
width
(required)height
(required)You may sometimes encouter performance issues on Android with very large images being scaled down to a small container. The best solution is to always try and request images with the appropriate size, however if you know the original image dimensions - you can use this property to set a custom width
and height
for the image. This will manually scale the image down before loading it into the view - giving you similar performance benefits to how React Native's resizeMethod="resize"
would work on the default <Image />
component.
resizeMode?: enum
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.onLoadStart?: () => void
Called when the image starts to load.
onProgress?: (event) => void
Called when the image is loading.
e.g. onProgress={e => console.log(e.nativeEvent.loaded / e.nativeEvent.total)}
onLoad?: (event) => void
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)}
onError?: () => void
Called on an image fetching error.
onLoadEnd?: () => void
Called when the image finishes loading, whether it was successful or an error.
style
A React Native style. Supports using borderRadius
.
fallback: boolean
If true will fallback to using Image
.
In this case the image will still be styled and laid out the same way as FastImage
.
FastImage.preload: (source[]) => void
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' },
},
])
If you have any problems using this library try the steps in troubleshooting 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 from vovkasm's react-native-web-image package. It also uses Glide and SDWebImage, but didn't have some features I needed (priority, headers).
FAQs
🚩 FastImage, performant React Native image component.
The npm package @connected-home/react-native-fast-image receives a total of 19 weekly downloads. As such, @connected-home/react-native-fast-image popularity was classified as not popular.
We found that @connected-home/react-native-fast-image demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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