Loads the receiver’s resource data in the background.
- macOS 10.0–10.4Deprecated
The client of the loading operation.
clientis notified of the receiver’s progress loading the resource data using the NSURLClient informal protocol. The NSURLClient messages are delivered on the current thread and require the run loop to be running.
Whether the URL should use cached resource data from an already loaded URL that refers to the same resource. If
YES, the cache is consulted when loading data. If
NO, the data is always loaded directly, without consulting the cache.