IOS开发中实现UITableView按照首字母将集合进行检索分组

/* *  pinyin.c */#define HANZI_START 19968#define HANZI_COUNT 20902static char firstLetterArray[HANZI_COUNT] = 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pinyinFirstLetter(unsigned short hanzi){    int index = hanzi - HANZI_START;    if (index >= 0 && index <= HANZI_COUNT)    {        return firstLetterArray[index];    }    else    {        return '#';    }}

////  ChineseString.m////  Created by leo on 15/8/11.//  Copyright (c) 2015年 fo. All rights reserved.//#import "ChineseString.h"@implementation ChineseString@synthesize string;@synthesize pinYin;#pragma mark - 返回tableview右方 indexArray+(NSMutableArray*)IndexArray:(NSArray*)stringArr{    NSMutableArray *tempArray = [self ReturnSortChineseArrar:stringArr];    NSMutableArray *A_Result=[NSMutableArray array];    NSString *tempString ;        for (NSString* object in tempArray)    {        NSString *pinyin = [((ChineseString*)object).pinYin substringToIndex:1];        //不同        if(![tempString isEqualToString:pinyin])        {            [A_Result addObject:pinyin];            tempString = pinyin;        }    }    return A_Result;}#pragma mark -+(NSMutableArray*)LetterSortArray:(NSArray*)stringArr{    NSMutableArray *tempArray = [self ReturnSortChineseArrar:stringArr];    NSMutableArray *LetterResult=[NSMutableArray array];    NSMutableArray *item = [NSMutableArray array];    NSString *tempString ;    //拼音分组    for (NSObject* object in tempArray) {          NSString *pinyin = [((ChineseString*)object).pinYin substringToIndex:1];        PictureBook *book=((ChineseString*)object).book;        //不同        if(![tempString isEqualToString:pinyin])        {            //分组            item = [NSMutableArray array];            [item  addObject:book];            [LetterResult addObject:item];            //遍历            tempString = pinyin;        }else//相同        {            [item  addObject:book];                   }    }    return LetterResult;}/** * 过滤指定字符串   里面的指定字符根据自己的需要添加 */+(NSString*)RemoveSpecialCharacter: (NSString *)str {    NSRange urgentRange = [str rangeOfCharacterFromSet: [NSCharacterSet characterSetWithCharactersInString: @",.？、 ~￥#&<>《》()[]{}【】^@/￡¤|§¨「」『』￠￢￣~@#&*（）——+|《》$_€"]];    if (urgentRange.location != NSNotFound)    {        return [self RemoveSpecialCharacter:[str stringByReplacingCharactersInRange:urgentRange withString:@""]];    }    return str;}/** *  返回排序好的字符拼音 * */+(NSMutableArray*)ReturnSortChineseArrar:(NSArray*)stringArr{    //获取字符串中文字的拼音首字母并与字符串共同存放    NSMutableArray *chineseStringsArray=[NSMutableArray array];    for(int i=0;i<[stringArr count];i++)    {        ChineseString *chineseString=[[ChineseString alloc]init];        PictureBook *book=[stringArr objectAtIndex:i];        chineseString.book=book;        chineseString.string=[NSString stringWithString:book.title];        if(chineseString.string==nil){            chineseString.string=@"";        }        //去除两端空格和回车        chineseString.string  = [chineseString.string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];        //此方法存在一些问题 有些字符过滤不了        //NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@／：；（）¥「」＂、[]{}#%-*+=_//|~＜＞$€^•'@#$%^&*()_+'/""];        //chineseString.string = [chineseString.string stringByTrimmingCharactersInSet:set];        //这里我自己写了一个递归过滤指定字符串   RemoveSpecialCharacter        chineseString.string =[ChineseString RemoveSpecialCharacter:chineseString.string];        // NSLog(@"string====%@",chineseString.string);        //判断首字符是否为字母        NSString *regex = @"[A-Za-z]+";        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];        NSString *initialStr = [chineseString.string length]?[chineseString.string substringToIndex:1]:@"";        if ([predicate evaluateWithObject:initialStr])        {            NSLog(@"chineseString.string== %@",chineseString.string);            //首字母大写            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{                chineseString.pinYin=@"";            }        }        [chineseStringsArray addObject:chineseString];    }    //按照拼音首字母对这些Strings进行排序    NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"pinYin" ascending:YES]];    [chineseStringsArray sortUsingDescriptors:sortDescriptors];    return chineseStringsArray;    }#pragma mark - 返回一组字母排序数组+(NSMutableArray*)SortArray:(NSArray*)stringArr{    NSMutableArray *tempArray = [self ReturnSortChineseArrar:stringArr];        //把排序好的内容从ChineseString类中提取出来    NSMutableArray *result=[NSMutableArray array];    for(int i=0;i<[stringArr count];i++){        [result addObject:((ChineseString*)[tempArray objectAtIndex:i]).string];    }    return result;}@end