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# AVAssetDownloadDelegate

A protocol that defines the methods to implement to respond to asset-download events.

```
protocol AVAssetDownloadDelegate : URLSessionTaskDelegate
```

## Topics

### Responding to download events

[`urlSession(_:assetDownloadTask:didResolve:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:assetDownloadTask:didResolve:))

Tells the delegate that a download task resolved the media selection to download, including any automatic selections.

[`urlSession(_:assetDownloadTask:didLoad:totalTimeRangesLoaded:timeRangeExpectedToLoad:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:assetDownloadTask:didLoad:totalTimeRangesLoaded:timeRangeExpectedToLoad:))

Tells the delegate that a download task loaded a new time range.

[`urlSession(_:assetDownloadTask:didFinishDownloadingTo:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:assetDownloadTask:didFinishDownloadingTo:))

Tells the delegate that a download task finished downloading the requested asset.

[`urlSession(_:assetDownloadTask:willDownloadVariants:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:assetDownloadTask:willDownloadVariants:))

Tells the delegate that a download task completed variant selection.

[`urlSession(_:assetDownloadTask:willDownloadTo:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:assetDownloadTask:willDownloadTo:))

Tells the delegate when a download task determines its download location.

[`urlSession(_:assetDownloadTask:didReceive:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:assetDownloadTask:didReceive:))

Sent when a download task receives an AVMetricEvent.

### Responding to aggregate download events

[`urlSession(_:aggregateAssetDownloadTask:willDownloadTo:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:aggregateAssetDownloadTask:willDownloadTo:))

Tells the delegate the final location of the asset when the download completes.

[`urlSession(_:aggregateAssetDownloadTask:didLoad:totalTimeRangesLoaded:timeRangeExpectedToLoad:for:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:aggregateAssetDownloadTask:didLoad:totalTimeRangesLoaded:timeRangeExpectedToLoad:for:))

Tells the delegate that the aggregate download task loaded a new time range.

[`urlSession(_:aggregateAssetDownloadTask:didCompleteFor:)`](/documentation/AVFoundation/AVAssetDownloadDelegate/urlSession(_:aggregateAssetDownloadTask:didCompleteFor:))

Tells the delegate that a child task finished downloading a media selection.


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