An instance of NSData containing some or all of the requested bytes.
This method may be invoked multiple times on the same instance of AVAssetResourceLoadingDataRequest to provide the full range of requested data incrementally. Upon each invocation, the value of the currentOffset property is updated to match the amount of data provided.
A Boolean value that indicates the entire remaining length of the resource from the offest to the end of the resource is being requested.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.