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e11d496e9d
Summary: Follow up to 9ec95673909beac7798f589e0e9821b4225f8fa9 Closes https://github.com/facebook/react-native/pull/16759 Differential Revision: D6285219 Pulled By: hramos fbshipit-source-id: 7012d257a5a6cff06cb2d94203a9379e4b7e3c4e
105 lines
2.1 KiB
Markdown
105 lines
2.1 KiB
Markdown
---
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id: imagestore
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title: ImageStore
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layout: docs
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category: APIs
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permalink: docs/imagestore.html
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next: interactionmanager
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previous: imagepickerios
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---
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### Methods
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- [`hasImageForTag`](docs/imagestore.html#hasimagefortag)
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- [`removeImageForTag`](docs/imagestore.html#removeimagefortag)
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- [`addImageFromBase64`](docs/imagestore.html#addimagefrombase64)
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- [`getBase64ForTag`](docs/imagestore.html#getbase64fortag)
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---
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# Reference
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## Methods
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### `hasImageForTag()`
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```javascript
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ImageStore.hasImageForTag(uri, callback)
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```
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Check if the ImageStore contains image data for the specified URI.
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@platform ios
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---
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### `removeImageForTag()`
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```javascript
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ImageStore.removeImageForTag(uri)
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```
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Delete an image from the ImageStore. Images are stored in memory and
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must be manually removed when you are finished with them, otherwise they
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will continue to use up RAM until the app is terminated. It is safe to
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call `removeImageForTag()` without first calling `hasImageForTag()`, it
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will simply fail silently.
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@platform ios
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---
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### `addImageFromBase64()`
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```javascript
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ImageStore.addImageFromBase64(base64ImageData, success, failure)
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```
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Stores a base64-encoded image in the ImageStore, and returns a URI that
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can be used to access or display the image later. Images are stored in
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memory only, and must be manually deleted when you are finished with
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them by calling `removeImageForTag()`.
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Note that it is very inefficient to transfer large quantities of binary
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data between JS and native code, so you should avoid calling this more
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than necessary.
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@platform ios
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---
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### `getBase64ForTag()`
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```javascript
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ImageStore.getBase64ForTag(uri, success, failure)
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```
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Retrieves the base64-encoded data for an image in the ImageStore. If the
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specified URI does not match an image in the store, the failure callback
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will be called.
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Note that it is very inefficient to transfer large quantities of binary
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data between JS and native code, so you should avoid calling this more
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than necessary. To display an image in the ImageStore, you can just pass
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the URI to an `<Image/>` component; there is no need to retrieve the
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base64 data.
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