Does -dataWithContentsOfURL: of NSData work in a background thread?

Question

Does -dataWithContentsOfURL: of NSData work in a background thread?

Answer 1

No, this will block the thread and you will load the contents of file into the RAM. You can download content directly into file without temporary NSData to avoid huge RAM usage. Something like this solution https://stackoverflow.com/a/6215458/2937913