//根据SEL方法返回的字符串判断对象应该处于哪个分区
- (NSInteger)sectionForObject:(id)object collationStringSelector:(SEL)selector;//根据SEL方法返回的string对数组元素排序
- (NSArray *)sortedArrayFromArray:(NSArray *)array collationStringSelector:(SEL)selector;

NSArray *testArr = @[@"悟空",@"沙僧",@"八戒", @"吴进", @"悟能", @"唐僧", @"诸葛亮", @"赵子龙",@"air", @"Asia", @"crash", @"basic", @"阿里郎"];NSMutableArray *personArr = [NSMutableArray arrayWithCapacity:testArr.count];for (NSString *str in testArr) {Person *person = [[Person alloc] initWithName:str];[personArr addObject:person];}UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];NSLog(@"%@", collation.sectionTitles);//1.获取获取section标题NSArray *titles = collation.sectionTitles;//2.构建每个section数组NSMutableArray *secionArray = [NSMutableArray arrayWithCapacity:titles.count];for (int i = 0; i < titles.count; i++) {NSMutableArray *subArr = [NSMutableArray array];[secionArray addObject:subArr];}//3.排序//3.1 按照将需要排序的对象放入到对应分区数组for (Person *person in personArr) {NSInteger section = [collation sectionForObject:person collationStringSelector:@selector(name)];NSMutableArray *subArr = secionArray[section];[subArr addObject:person];}//3.2 分别对分区进行排序for (NSMutableArray *subArr in secionArray) {NSArray *sortArr = [collation sortedArrayFromArray:subArr collationStringSelector:@selector(name)];[subArr removeAllObjects];[subArr addObjectsFromArray:sortArr];}

#pragma mark SectionTitles
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{return [[[UILocalizedIndexedCollation currentCollation] sectionTitles] objectAtIndex:section];
}- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{return [[UILocalizedIndexedCollation currentCollation] sectionIndexTitles];
}- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index
{return [[UILocalizedIndexedCollation currentCollation] sectionForSectionIndexTitleAtIndex:index];
}