突然想實現一個按照好友姓名的頭字母排序的通訊錄，然而想了想大致需要實現的技術點。

1：我需要將儲存好友姓名的陣列變成一個儲存好友姓名首字母的陣列，並且是按照順序的。

2：需要將儲存好友姓名的陣列按照同姓氏化為一個組方法變成若干個組，每組有若干個物件，所以就是變成若干個陣列，每一個組的資料就是TableView中的section，而組中的資料就是row.

效果圖：

第一步是將轉換漢子首字母，這裡我提供一個網上寫好的

.h

/*
 *  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 '#';
	}
}
 

/*
 *  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 = @"中國共產黨萬歲！";
 * for (int i = 0; i < [hanyu length]; i++)
 * {
 *     printf("%c", pinyinFirstLetter([hanyu characterAtIndex:i]));
 * }
 *
 */

char pinyinFirstLetter(unsigned short hanzi);
 

1：接下來就是返回儲存在陣列中的漢子對應的拼音了，排序好的

//獲取字串中文字的拼音首字母並與字串共同存放
    NSMutableArray *chineseStringsArray=[NSMutableArray array];
    for(int i=0;i<[stringArr count];i++)
    {
        ChineseString *chineseString=[[ChineseString alloc]init];
        chineseString.string=[NSString stringWithString:[stringArr objectAtIndex:i]];
        if(chineseString.string==nil){
            
 
[email protected]"";
        }
        //去除兩端空格和回車
        chineseString.string  = [chineseString.string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

        
        //這裡我自己寫了一個遞迴過濾指定字串   RemoveSpecialCharacter
        chineseString.string =[ChineseString RemoveSpecialCharacter:chineseString.string];
       // NSLog(@"string====%@",chineseString.string);
        
        
        //判斷首字元是否為字母
        NSString *regex = @"[A-Za-z]+";
        NSPredicate*predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
        
        if ([predicate evaluateWithObject:chineseString.string])
        {
            //首字母大寫
            chineseString.pinYin = [chineseString.string capitalizedString] ;
        }else{
            if(![chineseString.string isEqualToString:@""]){
                NSString *pinYinResult=[NSString string];
                for(int j=0;j<chineseString.string.length;j++){
                    NSString *singlePinyinLetter=[[NSString stringWithFormat:@"%c",pinyinFirstLetter([chineseString.string characterAtIndex:j])]uppercaseString];
                    
                    pinYinResult=[pinYinResult stringByAppendingString:singlePinyinLetter];
                }
                chineseString.pinYin=pinYinResult;
            }else{
                [email protected]"";
            }
        }
        [chineseStringsArray addObject:chineseString];
    }
    //按照拼音首字母對這些Strings進行排序
    NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"pinYin" ascending:YES]];
    [chineseStringsArray sortUsingDescriptors:sortDescriptors];

2：利用之前獲取到的漢子對應拼音的陣列，實現將姓名分類儲存，也是利用拼音首字母進行判斷，相同就說明儲存在同一陣列，不是就下一個陣列中，這樣就能實現了。

接下來只需要實現代理方法，對號入座即可