IOS中获取本地通讯录联系人以及汉字首字母排序

顺便把索引和tableView dataSource的代理方法也贴一下：

- (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; 
}