要实现这个功能，难点就在于如何找到汉字与拼音的对应关系，并用程序实现这样的规则。

网上找了下资料，找到一个用码表的方式实现的方法，是c语言版的，正好可以用上了。

下面是实现码表查询功能的两个c语言文件内容:

pinyin.h

/* * pinyin.h * Chinese Pinyin First Letter * * Created by George on 4/21/10. * Copyright 2010 RED/SAFI. All rights reserved. * */ /* * // Example * * #import "pinyin.h" * * NSString *hanyu = @"中国***万岁！"; * for (int i = 0; i < [hanyu length]; i++) * { * printf("%c", pinyinFirstLetter([hanyu characterAtIndex:i])); * } * */ char pinyinFirstLetter(unsigned short hanzi); 

讯享网/*
 *  pinyin.c
 *  Chinese Pinyin First Letter
 *
 *  Created by George on 4/21/10.
 *  Copyright 2010 RED/SAFI. All rights reserved.
 *
 */
#define HANZI_START 19968
#define HANZI_COUNT 20902
static char firstLetterArray[HANZI_COUNT] = 
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"xy";
char pinyinFirstLetter(unsigned short hanzi)
{
	int index = hanzi - HANZI_START;
	if (index >= 0 && index <= HANZI_COUNT)
	{
		return firstLetterArray[index];
	}
	else
	{
		return '#';
	}
}

这样我们就可以根据名字的第一个字，取其ascii码，根据上述算法，得到对应的拼音首字母，

如：“白沙”

NSString * name = @"白沙"; unichar firstHanzi = [name characterAtIndex:0];//取“白”的ascii码（30333） char py = pinyinFirstLetter(firstHanzi);//得到拼音首字母为b

核心问题解决了，下面我们就实现一个好友列表的拼音索引来做为实例

先建立一个名字实体类NameIndex，来储存好友名字等信息，如下:

NameIndex.h

讯享网@interface NameIndex : NSObject { NSString *_lastName; NSString *_firstName; NSInteger _sectionNum; NSInteger _originIndex; } @property (nonatomic, retain) NSString *_lastName; @property (nonatomic, retain) NSString *_firstName; @property (nonatomic) NSInteger _sectionNum; @property (nonatomic) NSInteger _originIndex; - (NSString *) getFirstName; - (NSString *) getLastName; @end

讯享网

@implementation NameIndex @synthesize _firstName, _lastName; @synthesize _sectionNum, _originIndex; - (NSString *) getFirstName { if ([_firstName canBeConvertedToEncoding: NSASCIIStringEncoding]) {//如果是英文 return _firstName; } else { //如果是非英文 return [NSString stringWithFormat:@"%c",pinyinFirstLetter([_firstName characterAtIndex:0])]; } } - (NSString *) getLastName { if ([_lastName canBeConvertedToEncoding:NSASCIIStringEncoding]) { return _lastName; } else { return [NSString stringWithFormat:@"%c",pinyinFirstLetter([_lastName characterAtIndex:0])]; } } - (void)dealloc { [_firstName release]; [_lastName release]; [super dealloc]; } @end

接下来构建列表索引：

讯享网UILocalizedIndexedCollation *theCollation = [UILocalizedIndexedCollation currentCollation];//这个是建立索引的核心 NSMutableArray *temp = [NSMutableArray arrayWithCapacity:0]; //测试 NSArray * nameArray = @[@"白飞",@"andy",@"张冲",@"林峰",@"kylin",@"王磊",@"emily",@"陈标",@"billy",@"韦丽"]; for (int i = 0; i<[nameArray count]; i++) { NameIndex *item = [[NameIndex alloc] init]; item._lastName　= [nameArray objectAtIndex:i]; item._originIndex = i; [temp addObject:item]; } //名字分section for (NameIndex *item in temp) { //getUserName是实现中文拼音检索的核心，见NameIndex类 NSInteger sect = [theCollation sectionForObject:item collationStringSelector:@selector(getLastName)]; //设定姓的索引编号 item._sectionNum = sect; } //返回27，是a－z和＃ NSInteger highSection = [[theCollation sectionTitles] count]; //tableView 会被分成27个section NSMutableArray *sectionArrays = [NSMutableArray arrayWithCapacity:highSection]; for (int i=0; i<=highSection; i++) { NSMutableArray *sectionArray = [NSMutableArray arrayWithCapacity:1]; [sectionArrays addObject:sectionArray]; } //根据sectionNum把名字加入到对应section数组里 for (NameIndex *item in temp) { [(NSMutableArray *)[sectionArrays objectAtIndex:item._sectionNum] addObject:item]; } //进行排序后，加入到数据源中 for (NSMutableArray *sectionArray in sectionArrays) { NSArray *sortedSection = [theCollation sortedArrayFromArray:sectionArray collationStringSelector:@selector(getFirstName)]; //按firstName进行排序 [self.friendsList addObject:sortedSection];//这里friendsList是自己定义的列表数据源 }

下面就是配置列表的delegate和datasource了：

-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{ NSMutableArray * existTitles = [NSMutableArray array]; NSArray * allTitles = [[UILocalizedIndexedCollation currentCollation]sectionTitles]; //section数组为空的title过滤掉，不显示 for (int i=0; i<[allTitles count]; i++) { if ([[self.friendsList objectAtIndex:i] count] > 0) { [existTitles addObject:[allTitles objectAtIndex:i]]; } } return existTitles; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return [self.friendsList count]; } -(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{ if ([[self.friendsList objectAtIndex:section] count] > 0) { return [[[UILocalizedIndexedCollation currentCollation] sectionTitles] objectAtIndex:section]; } return nil; } - (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index { return [[UILocalizedIndexedCollation currentCollation] sectionForSectionIndexTitleAtIndex:index]; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [[self.friendsList objectAtIndex:section] count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *cellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier]; if(cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]; } cell.textLabel.text = [NSString stringWithFormat:@"%@%@",((NameIndex*)[[self.friendsList objectAtIndex:indexPath.section] objectAtIndex:indexPath.row])._lastName,((NameIndex*)[[self.friendsList objectAtIndex:indexPath.section] objectAtIndex:indexPath.row])._firstName]; cell.selectionStyle = UITableViewCellSelectionStyleNone; cell.accessoryType = UITableViewCellAccessoryNone; return cell; }

这样一个基本的汉字拼音字母索引列表就做好了，效果如下图：

本文内容参考自下面两篇文章:

http://blog.csdn.net/chyroger/article/details/#

http://blog.csdn.net/lnnxsh/article/details/