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Calling depending Web Services + dispatch_group_t in iOS

What is the best approach to call the web services in a chain?

Create a dispatch group

dispatch_group_t serviceGroup;
Call the first function/web service
-(void)callFirstWebService { serviceGroup = dispatch_group_create();
//Call 1st web service here, In the completion block, call the second method which you want to perform serially [self callSecondWebService];

dispatch_group_notify(serviceGroup,dispatch_get_main_queue(),^{ // Won't get here until everything has finished NSLog(@"All Tasks finished"); //Reload table or another task which you want to perform when both service finished }); }

-(void) callSecondWebService{ dispatch_group_enter(serviceGroup); //Call 2nd web service and in the completion block, write the below code
dispatch_group_leave(serviceGroup); }

//*******************Theoretical Explantion*****************
Create a method where you want to call webservice. Depending on response, you want to call another webservice/method. After completion of all task, you want to perform las…