<!--
{
  "availability" : [
    "iPadOS: 26.0.0 -",
    "ios: 26.0.0 -",
    "maccatalyst: 26.0.0 -",
    "macos: 26.0.0 -",
    "tvos: 26.0.0 -",
    "xros: 26.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "StoreKit",
  "identifier" : "/documentation/StoreKit/SKDownloaderExtension",
  "metadataVersion" : "0.1.0",
  "role" : "Protocol",
  "symbol" : {
    "kind" : "Protocol",
    "modules" : [
      "StoreKit"
    ],
    "preciseIdentifier" : "c:objc(pl)SKDownloaderExtension"
  },
  "title" : "SKDownloaderExtension"
}
-->

# SKDownloaderExtension

An application extension that uses the system implementation to schedule Apple-hosted asset-pack downloads automatically.

```
@protocol SKDownloaderExtension <BAManagedDownloaderExtension>
```

## Overview

You can optionally implement the inherited `BAManagedDownloaderExtension` requirements, but don’t implement any of the inherited `BADownloaderExtension` requirements. For more information, see <doc://com.apple.documentation/documentation/BackgroundAssets>.

## Relationships

### Inherits From

[`BAManagedDownloaderExtension`](/documentation/BackgroundAssets/BAManagedDownloaderExtension)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)