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The NSOperation class is an abstract class you use to encapsulate the code and data associated with a single task


NSProgress is an API for tracking progress introduced in OS X 10.9 and iOS 7.1.



But i ve had difficulty implementing this it seems as though nsprogress is meant more for long operations that execute all their code on one background thread but have separate sections that make it easy to determine when progress has been made if this is the case then the use of the term suboperation is a bit misleading as it brings to mind the use of nested nsoperation

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Using NSProgress with nested NSOperations

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