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# NSURLConnectionDownloadDelegate

A protocol that delegates of a URL connection created with Newsstand Kit implement to receive data associated with a download.

```
protocol NSURLConnectionDownloadDelegate : NSURLConnectionDelegate
```

## Overview

The `NSURLConnectionDownloadDelegate` protocol describes methods that should be implemented by the delegate of instances of `NSURLConnection` created using Newsstand Kit’s `download(with:)` method. The methods in this protocol provide progress information about the download of a URL asset and, when downloading concludes, provide a file URL where the downloaded file can be accessed.

In addition to the methods described in this protocol, an `NSURLConnection` delegate should also implement the methods described in the [`NSURLConnectionDelegate`](/documentation/Foundation/NSURLConnectionDelegate) protocol.

> Note:
> If you are using `NSURLConnection` directly, your delegate class should instead implement the methods defined in the ``doc://com.apple.foundation/documentation/Foundation/NSURLConnectionDataDelegate`` protocol.

## Topics

### Managing Downloads of URL Assets

[`connection(_:didWriteData:totalBytesWritten:expectedTotalBytes:)`](/documentation/Foundation/NSURLConnectionDownloadDelegate/connection(_:didWriteData:totalBytesWritten:expectedTotalBytes:))

Sent to the delegate to deliver progress information for a download of a URL asset to a destination file.

[`connectionDidResumeDownloading(_:totalBytesWritten:expectedTotalBytes:)`](/documentation/Foundation/NSURLConnectionDownloadDelegate/connectionDidResumeDownloading(_:totalBytesWritten:expectedTotalBytes:))

Sent to the delegate when an URL connection resumes downloading a URL asset that was earlier suspended.

[`connectionDidFinishDownloading(_:destinationURL:)`](/documentation/Foundation/NSURLConnectionDownloadDelegate/connectionDidFinishDownloading(_:destinationURL:))

Sent to the delegate when the URL connection has successfully downloaded the URL asset to a destination file.


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