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# PHAssetResourceManager

A resource manager for the data storage underlying a Photos asset.

```
class PHAssetResourceManager
```

## Overview

An asset can have multiple underlying data resources—for example, both original and edited versions—each of which is represented by a [`PHAssetResource`](/documentation/Photos/PHAssetResource) object. Unlike the [`PHImageManager`](/documentation/Photos/PHImageManager) class, which provides and caches the primary representations of assets as thumbnails, image objects, or video objects, the asset resource manager provides direct access to these underlying data resources.

## Topics

### Getting the Asset Resource Manager

[`default()`](/documentation/Photos/PHAssetResourceManager/default())

Returns the shared asset resource manager object.

### Requesting Resources

[`requestData(for:options:dataReceivedHandler:completionHandler:)`](/documentation/Photos/PHAssetResourceManager/requestData(for:options:dataReceivedHandler:completionHandler:))

Requests the underlying data for the specified asset resource, to be delivered asynchronously.

[`cancelDataRequest(_:)`](/documentation/Photos/PHAssetResourceManager/cancelDataRequest(_:))

Cancels an asynchronous request.

[`writeData(for:toFile:options:completionHandler:)`](/documentation/Photos/PHAssetResourceManager/writeData(for:toFile:options:completionHandler:))

Requests the underlying data for the specified asset resource, to be asynchronously written to a local file.

### Constants

[`PHAssetResourceDataRequestID`](/documentation/Photos/PHAssetResourceDataRequestID)

A numeric identifier for an asynchronous asset resource loading request.

  <doc://com.apple.photokit/documentation/PhotoKit/resource-loading-request-identifiers>


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