一个简单的类似通讯录的封装代码

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废话不多说上代码 直接使用该方法就可以

- (void)allDataRanger {
    // 通讯录排序,分组
    UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];
    //得出collation索引的数量,这里是27个(26个字母和1个#)
    NSInteger sectionTitlesCount = [[collation sectionTitles] count];
    NSMutableArray *newSectionsArray = [[NSMutableArray alloc] initWithCapacity:sectionTitlesCount];
    //初始化27个空数组加入newSectionsArray
    for (NSInteger index = 0; index < sectionTitlesCount; index++) {
        NSMutableArray *array = [[NSMutableArray alloc] init];
        [newSectionsArray addObject:array];
    }
    //将每个人按name分到某个section下   _dataSource存储的是模型数组
    for (WDCar *model in _dataSource) {
        //获取name属性的值所在的位置,比如"林丹",首字母是L,在A~Z中排第11(第一位是0),sectionNumber就为11
        NSInteger sectionNumber = [collation sectionForObject:model collationStringSelector:@selector(name)];
        //把name为“林丹”的p加入newSectionsArray中的第11个数组中去
        NSMutableArray *sectionNames = newSectionsArray[sectionNumber];
        [sectionNames addObject:model];
    }
    //对每个section中的数组按照name属性排序
    for (NSInteger index = 0; index < sectionTitlesCount; index++) {
        NSMutableArray *personArrayForSection = newSectionsArray[index];
        NSArray *sortedPersonArrayForSection = [collation sortedArrayFromArray:personArrayForSection collationStringSelector:@selector(name)];
        newSectionsArray[index] = sortedPersonArrayForSection;
    }
    //将排序好的通讯录名单存到数据库里面  _indexDataSource存储的是计算出来的字母
    //    [messageDbManger saveUserToDataBase:_allDataSource];

    NSMutableArray *temp = [NSMutableArray new];
    _indexDataSource = [NSMutableArray new];
    [newSectionsArray enumerateObjectsUsingBlock:^(NSArray *arr, NSUInteger idx, BOOL *stop) {
        if (arr.count == 0) {
            [temp addObject:arr];
        } else {
            [_indexDataSource addObject:[collation sectionTitles][idx]];
        }
    }];
    // 存储的是每个字母下面的模型数组
    _allDataSource =[[NSMutableArray alloc]init];
    [newSectionsArray removeObjectsInArray:temp];
    [_allDataSource removeAllObjects];
    [_allDataSource addObjectsFromArray:newSectionsArray];

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转载自blog.csdn.net/u014128241/article/details/71600393