//
// pinyin.h
// renliandemo
//
// Created by mac on 15-1-14.
// Copyright (c) 2015年 mac. All rights reserved.
//
#ifndef __renliandemo__pinyin__
#define __renliandemo__pinyin__
#include <stdio.h>
#define ALPHA @"ABCDEFGHIJKLMNOPQRSTUVWXYZ#"
char pinyinFirstLetter(unsigned short hanzi);
#endif /* defined(__renliandemo__pinyin__) */
pinyin.c里面的内容
//
// pinyin.c
// renliandemo
//
// Created by mac on 15-1-14.
// Copyright (c) 2015年 mac. All rights reserved.
//
#include "pinyin.h"
#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 hanzi;
}
}
ChineseString.h里面的内容
@property(retain,nonatomic)NSString *string;
@property(retain,nonatomic)NSString *pinYin;
.m里面什么也不写
实现方法与方式
NSMutableArray *stringsToSort=[NSMutableArray arrayWithObjects:
@"电脑",
@"显示器",
@"你好",
@"推特",
@"乔布斯",
@"再见",
@"暑假作业",
@"键盘",
@"鼠标",
@"谷歌",
@"苹果",
nil];
//Step1输出
NSLog(@"尚未排序的NSString数组:");
for(int i=0;i<[stringsToSort count];i++){
NSLog(@"%@",[stringsToSort objectAtIndex:i]);
}
//Step2:获取字符串中文字的拼音首字母并与字符串共同存放
NSMutableArray *chineseStringsArray=[NSMutableArray array];
for(int i=0;i<[stringsToSort count];i++){
ChineseString *chineseString=[[ChineseString alloc]init];
chineseString.string=[NSString stringWithString:[stringsToSort objectAtIndex:i]];
if(chineseString.string==nil){
chineseString.string=@"";
}
if(![chineseString.string isEqualToString:@""]){
NSString *pinYinResult=[NSString string];
//for(int j=0;j<chineseString.string.length;j++)
for (int j=0;j<1;j++)
{
NSString *singlePinyinLetter=[[NSStringstringWithFormat:@"%c",pinyinFirstLetter([chineseString.stringcharacterAtIndex:j])]uppercaseString];
pinYinResult=[pinYinResult stringByAppendingString:singlePinyinLetter];
}
chineseString.pinYin=pinYinResult;
}else{
chineseString.pinYin=@"";
}
[chineseStringsArray addObject:chineseString];
}
//Step2输出
NSLog(@"\n\n\n转换为拼音首字母后的NSString数组");
for(int i=0;i<[chineseStringsArray count];i++){
ChineseString *chineseString=[chineseStringsArray objectAtIndex:i];
NSLog(@"原String:%@----拼音首字母String:%@",chineseString.string,chineseString.pinYin);
}
//Step3:按照拼音首字母对这些Strings进行排序
NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptorsortDescriptorWithKey:@"pinYin" ascending:YES]];
[chineseStringsArray sortUsingDescriptors:sortDescriptors];
//Step3输出
NSLog(@"\n\n\n按照拼音首字母后的NSString数组");
for(int i=0;i<[chineseStringsArray count];i++){
ChineseString *chineseString=[chineseStringsArray objectAtIndex:i];
NSLog(@"原String:%@----拼音首字母String:%@",chineseString.string,chineseString.pinYin);
}
//根据首字母来进行分组
NSMutableArray *_dataArray = [[NSMutableArray alloc] init];
NSMutableArray *subArray = [[NSMutableArray alloc] init];
ChineseString *string = chineseStringsArray[0];
[subArray addObject:string];
for (int i=1; i<chineseStringsArray.count; i++)
{
ChineseString *str = chineseStringsArray[i-1];
ChineseString *str1 = chineseStringsArray[i];
if ([str.pinYin isEqualToString:str1.pinYin])
{
[subArray addObject:str1];
}
else
{
[_dataArray addObject:subArray];
subArray = [[NSMutableArray alloc] init];
[subArray addObject:str1];
}
}
[_dataArray addObject:subArray];
for (NSArray *array in _dataArray)
{
for (ChineseString *str in array)
{
NSLog(@"%@",str.string);
}
}
// Step4:如果有需要,再把排序好的内容从ChineseString类中提取出来
NSMutableArray *result=[NSMutableArray array];
for(int i=0;i<[chineseStringsArray count];i++){
[result addObject:((ChineseString*)[chineseStringsArray objectAtIndex:i]).string];
}
//Step4输出
NSLog(@"\n\n\n最终结果:");
for(int i=0;i<[result count];i++){
NSLog(@"%@",[result objectAtIndex:i]);
}
还有一点需要注意的是:好友首字母的数组里可能有重复的,这个需要你自己删除重复的,这个就不用说了
最后附上demo下载地址:http://download.youkuaiyun.com/detail/a174455171/9669952