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Image

A React component for displaying different types of images, including network images, static resources, temporary local images, and images from local disk, such as the camera roll.

This example shows fetching and displaying an image from local storage as well as one from network and even from data provided in the 'data:' uri scheme.

Note that for network and data images, you will need to manually specify the dimensions of your image!

Examples#

You can also add style to an image:

GIF and WebP support on Android#

When building your own native code, GIF and WebP are not supported by default on Android.

You will need to add some optional modules in android/app/build.gradle, depending on the needs of your app.

dependencies {  // If your app supports Android versions before Ice Cream Sandwich (API level 14)  implementation 'com.facebook.fresco:animated-base-support:1.3.0'
  // For animated GIF support  implementation 'com.facebook.fresco:animated-gif:2.0.0'
  // For WebP support, including animated WebP  implementation 'com.facebook.fresco:animated-webp:2.1.0'  implementation 'com.facebook.fresco:webpsupport:2.0.0'
  // For WebP support, without animations  implementation 'com.facebook.fresco:webpsupport:2.0.0'}

Reference

Props#

View Props#

Inherits View Props.


accessible#

When true, indicates the image is an accessibility element.

TypeDefault
boolfalse

accessibilityLabel#

The text that's read by the screen reader when the user interacts with the image.

Type
string

blurRadius#

blurRadius: the blur radius of the blur filter added to the image.

Type
number

Tip : IOS you will need to increase blurRadius more than 5


capInsets
iOS
#

When the image is resized, the corners of the size specified by capInsets will stay a fixed size, but the center content and borders of the image will be stretched. This is useful for creating resizable rounded buttons, shadows, and other resizable assets. More info in the official Apple documentation.

Type
Rect

defaultSource#

A static image to display while loading the image source.

Type
ImageSource

Note: On Android, the default source prop is ignored on debug builds.


fadeDuration
Android
#

Fade animation duration in miliseconds.

TypeDefault
number300

loadingIndicatorSource#

Similarly to source, this property represents the resource used to render the loading indicator for the image, displayed until image is ready to be displayed, typically after when it got downloaded from network.

Type
ImageSource (uri only), number

onError#

Invoked on load error.

Type
({ nativeEvent: { error } }) => void

onLayout#

Invoked on mount and on layout changes.

Type
({ nativeEvent: LayoutEvent }) => void

onLoad#

Invoked when load completes successfully.

Type
(ImageLoadEvent) => void

onLoadEnd#

Invoked when load either succeeds or fails.

Type
() => void

onLoadStart#

Invoked on load start.

Example: onLoadStart={() => this.setState({loading: true})}

Type
() => void

onPartialLoad
iOS
#

Invoked when a partial load of the image is complete. The definition of what constitutes a "partial load" is loader specific though this is meant for progressive JPEG loads.

Type
() => void

onProgress#

Invoked on download progress.

Type
({ nativeEvent: { loaded, total } }) => void

progressiveRenderingEnabled
Android
#

When true, enables progressive jpeg streaming - https://frescolib.org/docs/progressive-jpegs.

TypeDefault
boolfalse

resizeMethod
Android
#

The mechanism that should be used to resize the image when the image's dimensions differ from the image view's dimensions. Defaults to auto.

  • auto: Use heuristics to pick between resize and scale.

  • resize: A software operation which changes the encoded image in memory before it gets decoded. This should be used instead of scale when the image is much larger than the view.

  • scale: The image gets drawn downscaled or upscaled. Compared to resize, scale is faster (usually hardware accelerated) and produces higher quality images. This should be used if the image is smaller than the view. It should also be used if the image is slightly bigger than the view.

More details about resize and scale can be found at http://frescolib.org/docs/resizing.

TypeDefault
enum('auto', 'resize', 'scale')'auto'

resizeMode#

Determines how to resize the image when the frame doesn't match the raw image dimensions. Defaults to cover.

  • cover: 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).

  • 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).

  • stretch: Scale width and height independently, This may change the aspect ratio of the src.

  • repeat: Repeat the image to cover the frame of the view. The image will keep its size and aspect ratio, unless it is larger than the view, in which case it will be scaled down uniformly so that it is contained in the view.

  • center: Center the image in the view along both dimensions. If the image is larger than the view, scale it down uniformly so that it is contained in the view.

TypeDefault
enum('cover', 'contain', 'stretch', 'repeat', 'center')'cover'

source#

The image source (either a remote URL or a local file resource).

This prop can also contain several remote URLs, specified together with their width and height and potentially with scale/other URI arguments. The native side will then choose the best uri to display based on the measured size of the image container. A cache property can be added to control how networked request interacts with the local cache. (For more information see Cache Control for Images).

The currently supported formats are png, jpg, jpeg, bmp, gif, webp, psd (iOS only). In addition, iOS supports several RAW image formats. Refer to Apple's documentation for the current list of supported camera models (for iOS 12, see https://support.apple.com/en-ca/HT208967).

Type
ImageSource

style#

Type
Image Style Props, Layout Props, Shadow Props, Transforms

testID#

A unique identifier for this element to be used in UI Automation testing scripts.

Type
string

Methods#

abortPrefetch()
Android
#

Image.abortPrefetch(requestId);

Abort prefetch request.

Parameters:

NameTypeDescription
requestId
Required
numberRequest id as returned by prefetch().

getSize()#

Image.getSize(uri, success, [failure]);

Retrieve the width and height (in pixels) of an image prior to displaying it. This method can fail if the image cannot be found, or fails to download.

In order to retrieve the image dimensions, the image may first need to be loaded or downloaded, after which it will be cached. This means that in principle you could use this method to preload images, however it is not optimized for that purpose, and may in future be implemented in a way that does not fully load/download the image data. A proper, supported way to preload images will be provided as a separate API.

Parameters:

Name
TypeDescription
uri
Required
stringThe location of the image.
success
Required
functionThe function that will be called if the image was successfully found and width and height retrieved.
failurefunctionThe function that will be called if there was an error, such as failing to retrieve the image.

getSizeWithHeaders()#

Image.getSizeWithHeaders(uri, headers, success, [failure]);

Retrieve the width and height (in pixels) of an image prior to displaying it with the ability to provide the headers for the request. This method can fail if the image cannot be found, or fails to download. It also does not work for static image resources.

In order to retrieve the image dimensions, the image may first need to be loaded or downloaded, after which it will be cached. This means that in principle you could use this method to preload images, however it is not optimized for that purpose, and may in future be implemented in a way that does not fully load/download the image data. A proper, supported way to preload images will be provided as a separate API.

Parameters:

Name
TypeDescription
uri
Required
stringThe location of the image.
headers
Required
objectThe headers for the request.
success
Required
functionThe function that will be called if the image was successfully found and width and height retrieved.
failurefunctionThe function that will be called if there was an error, such as failing to retrieve the image.

prefetch()#

await Image.prefetch(url);

Prefetches a remote image for later use by downloading it to the disk cache. Returns a promise which resolves to a boolean.

Parameters:

NameTypeDescription
url
Required
stringThe remote location of the image.
callbackfunction
Android
The function that will be called with the requestId.

queryCache()#

await Image.queryCache(urls);

Perform cache interrogation. Returns a promise which resolves to a mapping from URL to cache status, such as "disk", "memory" or "disk/memory". If a requested URL is not in the mapping, it means it's not in the cache.

Parameters:

NameTypeDescription
urls
Required
arrayList of image URLs to check the cache for.

resolveAssetSource()#

Image.resolveAssetSource(source);

Resolves an asset reference into an object which has the properties uri, width, and height.

Parameters:

Name
TypeDescription
source
Required
ImageSource, numberA number (opaque type returned by require('./foo.png')) or an ImageSource.

Type Definitions#

ImageCacheEnum
iOS
#

Enum which can be used to set the cache handling or stategy for the potentially cached responses.

TypeDefault
enum('default', 'reload', 'force-cache', 'only-if-cached')'default'
  • default: Use the native platforms default strategy.
  • reload: The data for the URL will be loaded from the originating source. No existing cache data should be used to satisfy a URL load request.
  • force-cache: The existing cached data will be used to satisfy the request, regardless of its age or expiration date. If there is no existing data in the cache corresponding the request, the data is loaded from the originating source.
  • only-if-cached: The existing cache data will be used to satisfy a request, regardless of its age or expiration date. If there is no existing data in the cache corresponding to a URL load request, no attempt is made to load the data from the originating source, and the load is considered to have failed.

ImageLoadEvent#

Object returned in the onLoad callback.

Type
object

Properties:

NameTypeDescription
widthnumberThe width of loaded image.
heightnumberThe height of loaded image.
uristringA string representing the resource identifier for the image.

ImageSource#

Type
object, array of objects, number

Properties (if passing as object or array of objects):

Name
TypeDescription
uristringA string representing the resource identifier for the image, which could be an http address, a local file path, or the name of a static image resource.
widthnumberCan be specified if known at build time, in which case the value will be used to set the default <Image/> component dimension.
heightnumberCan be specified if known at build time, in which case the value will be used to set the default <Image/> component dimension.
scalenumberUsed to indicate the scale factor of the image. Defaults to 1.0 if unspecified, meaning that one image pixel equates to one display point / DIP.
bundle
iOS
stringThe iOS asset bundle which the image is included in. This will default to [NSBundle mainBundle] if not set.
methodstringThe HTTP Method to use. Defaults to 'GET' if not specified.
headersobjectAn object representing the HTTP headers to send along with the request for a remote image.
bodystringThe HTTP body to send with the request. This must be a valid UTF-8 string, and will be sent exactly as specified, with no additional encoding (e.g. URL-escaping or base64) applied.
cache
iOS
ImageCacheEnumDetermines how the requests handles potentially cached responses.

If passing a number:

  • number - opaque type returned by something like require('./image.jpg').