Document Revision History

This table describes the changes to NSOperation Class Reference.

2012-01-09Updated the information about completion blocks to reflect that they should not be used to queue additional work related to your operation object's task.
2009-04-20Updated for OS X v10.6.
2008-11-19Updated the guidelines related to KVO compliance.
2008-10-15Clarified cancellation semantics for concurrent operations.
2007-04-30New document describing methods for managing encapsulated tasks.