ios - How does NSURLConnection gives callback on the same thread? -


how nsurlconnection asynchronous request gives callbacks on same thread called from?

if have design worker class take work off calling thread , when done give completion callback on same thread called from, how that?

typedef void (^basictask)(void);  @protocol workerdelegate - (void)taskdidsucceed; - (void)taskdidfailwitherror:(nsstring *)errordescription; @end  @interface worker {     id <workerdelegate> delegate; } -(void)performtaskinbackground:(basictask)task; @end


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