NSURLDownload class downloads a request asynchronously and saves the data to a file. The interface for
NSURLDownload provides methods to initialize a download, set the destination path and cancel loading the request.
- macOS 10.2+
The delegate object assigned to each instance of this class should implement the methods defined by the
NSURLDownload protocol. These methods provide the delegate with the current status of in-progress asynchronous downloads and allow the delegate to customize the URL loading process. These delegate methods are called on the thread that started the asynchronous load operation for the associated