Sent to the delegate when the URL connection has successfully downloaded the URL asset to a destination file.
- iOS 5.0+
- macOS 10.8+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
The URL connection object that downloaded the asset.
A file URL specifying a destination in the file system. For iOS applications, this is a location in the application sandbox.
This method will be called once after a successful download. The file downloaded to
destination is guaranteed to exist there only for the duration of this method implementation; the delegate should copy or move the file to a more persistent and appropriate location.