ios - Error in class method when implementing Core Data Stack -


i followed this tutorial implement core data stack , i'm getting error in temporaryworkercontext class method. 

+ (nsmanagedobjectcontext *)temporaryworkercontext {      nsmanagedobjectcontext *tempmocontext = [[nsmanagedobjectcontext alloc] initwithconcurrencytype:nsprivatequeueconcurrencytype];     tempmocontext.parentcontext = _mainmanagedobjectcontext;<--error here: instance variable '_mainmanagedobjectcontext' accessed in class method     return tempmocontext; }

my question is, correct way implement core data stack without errors? class method required, controller calling hold strong reference temporaryworkercontext.


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