ios - Child view controller elements not visible in delegate call back method -


This is my scenario, I have a child view controller to see the controller b and B , I am creating an NSURL session call and send the asynchronous response to the main thread on the response 

  dispatch_async (dispatch_get_main_queue (), ^ {// call call back delegation method [self Delegate cllBackMethod];}

In view controller B. I am setting the representative as myself and this call back Method defining method 

  - (zero) callBackMethod {NSLog (@ "% @", self header label); self.headerLabel.hidden = YES;}  < / Pre> 
 If i  b  as a child's view controller  a , its logging (null) and i can not access b elements, but If I make it from the  B  to  A  as a child view controller, I am capable of reaching these elements and amending it
 
 Why is this happening? And how can I fix it?


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