gistfile1.m

  __block XXCurrentUser * user = nil;
  dispatch_group_t group = dispatch_group_create();


  [[XXClient sharedManager] setObserverDidSignInBlock:^(XXAccessCredential *accessCredential, NSError *error) {
    [[LUKeychainAccess standardKeychainAccess] setObject:accessCredential forKey:NSStringFromClass([self class])];
    if(error)theBlock(nil,error);
    else dispatch_group_leave(group);
  }];
  
  dispatch_group_enter(group);  
  dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    dispatch_group_enter(group);
    [[XXClient sharedManager] requestMyProfile:^(NSDictionary *responseObject, NSError * error) {
      if(error) theBlock(nil, error);
      else {
       user = [self objectFromResponseDictionary:responseObject];
        dispatch_group_leave(group);
      }
    }];
  });
  
  
  dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    dispatch_group_enter(group);
    [[MagicalRecordStack defaultStack].context MR_saveToPersistentStoreWithCompletion:^(BOOL success, NSError *error) {
      if(error) theBlock(nil,error);
       else dispatch_group_leave(group);
    }];
    
  });
  
  dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    dispatch_group_enter(group);
    [user requestGrantedApplicationsOnCompletionBlock:^(XXCurrentUser *currentUser, NSError *error) {
      if(error) theBlock(nil,error);
      else dispatch_group_leave(group);
    }];
  });

  dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    dispatch_group_enter(group);
    [user requestGrantedApplicationsOnCompletionBlock:^(XXCurrentUser *currentUser, NSError *error) {
      if(error) theBlock(nil,error);
      else dispatch_group_leave(group);
    }];
  });

  dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    dispatch_group_enter(group);
    [user requestActionsOnCompletionBlock:^(XXCurrentUser *currentUser, NSError *error) {
      if(error) theBlock(nil,error);
      else theBlock(currentUser, error);
    }];
  });