splitArray.m

  NSMutableArray *resultArray = [NSMutableArray new];
    NSArray *groups = [self.survey.questions valueForKeyPath:@"@distinctUnionOfObjects.type"];
    for (NSString *groupId in groups)
    {
        NSMutableDictionary *entry = [NSMutableDictionary new];
        [entry setObject:groupId forKey:@"type"];
        
        NSArray *groupNames = [self.survey.questions filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"type = %@", groupId]];

        [entry setObject:groupNames forKey:@"values"];

        [resultArray addObject:entry];
    }
    NSMutableArray *finalArr = [@[] mutableCopy];
    [resultArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSMutableDictionary *values = obj;
        if([values[@"type"] isEqualToString:@"单选"]){
            NSArray *arr = values[@"values"];
            [values setObject:[NSArray splitArray:arr componentsPerSegment:5] forKey:@"values"];
        }
        if([values[@"type"] isEqualToString:@"问答"] || [values[@"type"] isEqualToString:@"多选"] ){
            NSArray *arr = values[@"values"];
            [values setObject:[NSArray splitArray:arr componentsPerSegment:1] forKey:@"values"];
        }
        [values[@"values"] enumerateObjectsUsingBlock:^(id objArr, NSUInteger idxArr, BOOL *stopArr) {
            [finalArr addObject:objArr];
        }];
        
    }];