IOS中获取本地通讯录联系人以及汉字首字母排序

/*** 加载本地联系人*/ - (void)loadLocalContacts {   //新建一个通讯录类   ABAddressBookRef addressBooks = nil;      if (DeviceVersion < 6.0) {     addressBooks = ABAddressBookCreate();   } else {     addressBooks = ABAddressBookCreateWithOptions(NULL, NULL);     //获取通讯录权限     dispatch_semaphore_t sema = dispatch_semaphore_create(0);     ABAddressBookRequestAccessWithCompletion(addressBooks, ^(bool granted, CFErrorRef error){dispatch_semaphore_signal(sema);});     dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);     dispatch_release(sema);   }      //判断授权状态   if (ABAddressBookGetAuthorizationStatus()!=kABAuthorizationStatusAuthorized) {     return ;   }      //获取通讯录中的所有人   CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople(addressBooks);   //通讯录中人数   CFIndex nPeople = ABAddressBookGetPersonCount(addressBooks);   NSMutableArray *persons = [[NSMutableArray alloc] init];   for (int i = 0; i < nPeople; i++) {     //获取个人     ABRecordRef person = CFArrayGetValueAtIndex(allPeople, i);     //获取个人名字     NSString *firstName = (NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty);     NSString *lastName = (NSString *)ABRecordCopyValue(person, kABPersonLastNameProperty);     NSMutableString *name = [[NSMutableString alloc] init];     if (firstName == nil && lastName == nil) {       NSLog(@"名字不存在的情况");       name = nil;     }     if (lastName) {       [name appendString:lastName];     }     if (firstName) {       [name appendString:firstName];     }          ABMultiValueRef tmlphone = ABRecordCopyValue(person, kABPersonPhoneProperty);     NSString *telphone = (NSString *)ABMultiValueCopyValueAtIndex(tmlphone, 0);     if (telphone != nil) {       telphone = [telphone stringByReplacingOccurrencesOfString:@"-" withString:@""];       NSString *title = [NSString stringWithFormat:@"%@(%@)",name,telphone];       [persons addObject:title];     }   }      //对联系人进行分组和排序   UILocalizedIndexedCollation *theCollation = [UILocalizedIndexedCollation currentCollation];   NSInteger highSection = [[theCollation sectionTitles] count]; //中文环境下返回的应该是27，是a－z和＃，其他语言则不同      //_indexArray 是右侧索引的数组，也是secitonHeader的标题   _indexArray = [[NSMutableArray alloc] initWithArray:[theCollation sectionTitles]];      NSMutableArray *newSectionsArray = [[NSMutableArray alloc] initWithCapacity:highSection];   //初始化27个空数组加入newSectionsArray   for (NSInteger index = 0; index < highSection; index++) {     NSMutableArray *array = [[NSMutableArray alloc] init];     [newSectionsArray addObject:array];     [array release];   }      for (NSString *p in persons) {     //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 = [theCollation sectionForObject:p collationStringSelector:@selector(getFirstLetter)];     //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:p];   }      for (int i = 0; i < newSectionsArray.count; i++) {     NSMutableArray *sectionNames = newSectionsArray[i];     if (sectionNames.count == 0) {       [newSectionsArray removeObjectAtIndex:i];       [_indexArray removeObjectAtIndex:i];       i--;     }   }      //_contacts 是联系人数组（确切的说是二维数组）   self.contacts = newSectionsArray;   [newSectionsArray release];      [self.tableView reloadData]; } 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {   return self.contacts.count; }  - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {   return [self.contacts[section] count]; }  - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {   static NSString *identifier = @"contactCell";   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];   if (cell == nil) {     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];   }      cell.imageView.image = [UIImage imageNamed:@"default_head"];   cell.textLabel.text = [self.contacts objectAtIndex:indexPath.section][indexPath.row];   return cell; }  - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {   return [_indexArray objectAtIndex:section]; }  - (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {   return _indexArray; }  //索引列点击事件 - (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {   return index; } 

 NSString *ret = @"";   if (![self canBeConvertedToEncoding: NSASCIIStringEncoding]) {//如果是英语     if ([[self letters] length]>2) {       ret = [[self letters] substringToIndex:1];     }   }   else {     ret = [NSString stringWithFormat:@"%c",[self characterAtIndex:0]];   }   return ret; } 

- (NSString *)letters{   NSMutableString *letterString = [NSMutableString string];   int len = [self length];   for (int i = 0;i < len;i++)   {     NSString *oneChar = [[self substringFromIndex:i] substringToIndex:1];     if (![oneChar canBeConvertedToEncoding:NSASCIIStringEncoding]) {       NSArray *temA = makePinYin2([oneChar characterAtIndex:0]);       if ([temA count]>0) {         oneChar = [temA objectAtIndex:0];       }     }     [letterString appendString:oneChar];   }   return letterString; }