IOS中文排序学习

前言:

最近有中文排序的需要,发现系统没有提供中文排序的方法,于是参考学习了网上前辈的代码实现了中文排序功能,本文记录的就是学习实现中文排序的过程。

实现英文排序

系统提供了英文排序的方法。写了一个逆的数组,排序后正序:

//  数组英文begin
        NSMutableArray *dataArray=[NSMutableArray array];
        [dataArray addObjectsFromArray:@[@"d",@"c",@"b",@"a",]];
        NSLog(@"origin");
        for (NSString *string in dataArray) {
            NSLog(@"%@",string);
        }

        // 第一次排序
        NSArray *sortEnglish=[dataArray sortedArrayUsingSelector:@selector(compare:)];
        NSLog(@"first");
        for (NSString *string in sortEnglish) {
            NSLog(@"%@",string);
        }

输出结果:

中文排序思路:

很显然英文排序实现十分简单,那么中文如何排序呢?我们这里使用的是拼音排序,也就说用拼音的顺序排列中文。所以思路是:1中文转化成拼音首字母——2 对拼音首字母进行排序

unicode编码:

显然,中文转化成拼音成了关键。苹果是使用unicode编码的(网上的文章都是这么说……)。那么unicode到底什么呢?

简单的说,Unicode是一个密码本,他把世界上所有的语言符号用数字的方式表示出来,只要你有一个字,本里面就有一个对应的数值。(详见:http://baike.baidu.com/link?url=ogmtmX6bpNBj2Sh3aTgpEJyJbllhAsUuc-kjcZyr45a5RliR5D4EHwmMQsLU2MsxqX8gw5ULcKEp0f4c951LIq)

而Unicode里面有20902 个汉字对应的字符,于是网上一个神奇的牛人写了一个数组,数组内包含了20902个汉字的汉语拼音(强大吧,其实你写上20902次ifelse 也能实现汉字转换)

下面看看这个数组:

#include<stdio.h>
#define HANZI_START 19968
#define HANZI_COUNT 20902

static char firstLetterArray[HANZI_COUNT] =
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"xy";

获取汉字的Unicode数值

同志们已经写好了上文那个恐怖的数组,接下来如何获取汉字的Unicode码呢?这里我们利用char 和 int 之间的类型转换来实现,比如我们要获取“字”的Unicode码

NSLog(@"字的Unicode码是 %d",[@"字" characterAtIndex:0]);

输出结果:

相关代码:

https://git.oschina.net/zhengaoxing/sortChinese

欢迎转载

转载请注明出处

本文地址:http://blog.csdn.net/zhenggaoxing/article/details/43565807

时间: 2024-10-12 09:09:51

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// //  main.m //  10.1.2 // //  Created by fwzx11 on 16/1/10. //  Copyright (c) 2016年 Blue Mobi. All rights reserved. // #define NSLog(FORMAT, ...) fprintf(stderr,"%s\n",[[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]); #import &l