通过网上的拼音排序方法，自己写的一些代码

最近由于项目里用到了拼音排序，所以上网找了一些资料，下面是我的一些心得。

首先，上网上搜了到了一个第三方，在这里感谢一下大神作者George。

把第三方导入工程

这里贴一下源码

#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;
	}
}

这个函数主要基于一个巨大的c语言char数组，把unicode字符集中所有中文的拼音首字母都映射进去了。

pinyinFirstLetter基于这么一个简单的原理：我们知道，在Objective C语言中，字符串是以unicode进行编码的。在unicode字符集中，汉字的编码范围为4E00 到 9FA5 之间（即从第19968开始的20902个字符是中文简体字符）。我们把这些字符的拼音首字母按照顺序都存放在一个char数组中。当我们查找一个汉字的拼音首字母时，只需把这个汉字的unicode码（即char强制转换为int）减去19968，然后用这个数字作为索引去找char数组中存放的字母即可。

就这样，有这个char数组为基础，一切都变得非常简单

下面是我自己的工程代码

//返回list列表的数组
+ (NSMutableArray *)backListArray:(NSData *)data{
    
    //从json得到数据
    NSDictionary *dict = [[data objectFromJSONData] objectAtIndex:0] ;
    
    NSString *jsonStr = [dict objectForKey:@"fonts"];
    
    //得到总体数组
    NSArray *jsonArray = [jsonStr objectFromJSONString];
    
    //创建数组
    NSMutableArray *AllListArray = [[NSMutableArray alloc]initWithCapacity:0];
    
    //把所有名字放在一个未排序的数组里
    for (NSDictionary *jsonDict in jsonArray) {
        NSString *nameStr = [jsonDict objectForKey:@"fontName"];
        [AllListArray addObject:nameStr];
    }
    
    NSMutableArray *listArray = [self backSectionArray:AllListArray WithJsonArray:jsonArray];
    
    return listArray;
}

//排序数组的方法
+ (NSMutableArray *)backSectionArray:(NSMutableArray *)array WithJsonArray:(NSArray *)jsonArray{
    
    //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<[array count];i++){
        
        ChineseString *chineseString=[[ChineseString alloc]init];
        
        chineseString.string=[NSString stringWithString:[array objectAtIndex:i]];
        
        if(chineseString.string==nil){
            chineseString.string=@"";
        }
        
        if(![chineseString.string isEqualToString:@""]){
            NSString *pinYinResult=[NSString string];
            for(int j=0;j

//按字母合并数组
+ (NSMutableArray *)backSectionOfRowArray:(NSMutableArray *)array WithJsonArray:(NSArray *)jsonArray{
    
    //创建row数组
    NSMutableArray *aArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *bArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *cArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *dArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *eArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *fArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *gArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *hArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *iArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *jArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *kArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *lArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *mArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *nArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *oArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *pArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *qArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *rArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *sArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *tArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *uArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *vArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *wArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *xArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *yArray = [[NSMutableArray alloc]initWithCapacity:0];
    NSMutableArray *zArray = [[NSMutableArray alloc]initWithCapacity:0];
    
    for (ChineseString *str in array) {
        
        //将字符串转char，变成ASCII的int值
        int i = [str.pinYin characterAtIndex:0];
        
        switch (i) {
            case 65:{
                [aArray addObject:str];
            }
                break;
            case 66:{
                [bArray addObject:str];
            }
                break;
            case 67:{
                [cArray addObject:str];
            }
                break;
            case 68:{
                [dArray addObject:str];
            }
                break;
            case 69:{
                [eArray addObject:str];
            }
                break;
            case 70:{
                [fArray addObject:str];
            }
                break;
            case 71:{
                [gArray addObject:str];
            }
                break;
            case 72:{
                [hArray addObject:str];
            }
                break;
            case 73:{
                [iArray addObject:str];
            }
                break;
            case 74:{
                [jArray addObject:str];
            }
                break;
            case 75:{
                [kArray addObject:str];
            }
                break;
            case 76:{
                [lArray addObject:str];
            }
                break;
            case 77:{
                [mArray addObject:str];
            }
                break;
            case 78:{
                [nArray addObject:str];
            }
                break;
            case 79:{
                [oArray addObject:str];
            }
                break;
            case 80:{
                [pArray addObject:str];
            }
                break;
            case 81:{
                [qArray addObject:str];
            }
                break;
            case 82:{
                [rArray addObject:str];
            }
                break;
            case 83:{
                [sArray addObject:str];
            }
                break;
            case 84:{
                [tArray addObject:str];
            }
                break;
            case 85:{
                [uArray addObject:str];
            }
                break;
            case 86:{
                [vArray addObject:str];
            }
                break;
            case 87:{
                [wArray addObject:str];
            }
                break;
            case 88:{
                [xArray addObject:str];
            }
                break;
            case 89:{
                [yArray addObject:str];
            }
                break;
            case 90:{
                [zArray addObject:str];
            }
                break;
            default:
                break;
        }
    }
    
    //返回数组
    NSMutableArray *sectionAndRow = [[NSMutableArray alloc]initWithObjects:aArray,bArray,cArray,dArray,eArray,fArray,gArray,hArray,iArray,jArray,kArray,lArray,mArray,nArray,oArray,pArray,qArray,rArray,sArray,tArray,uArray,vArray,wArray,xArray,yArray,zArray, nil];
    
    //返回列表的item数组
    NSMutableArray *BackSectionAndRow = [[NSMutableArray alloc]initWithCapacity:0];
    
    for (NSArray *array in sectionAndRow) {
        
        NSMutableArray *backRow = [[NSMutableArray alloc]initWithCapacity:0];
        
        for (ChineseString *str in array) {
            
            for (NSDictionary *dict in jsonArray) {
            
                if ([[dict objectForKey:@"fontName"]isEqualToString:str.string]) {
                
                    OnLineItem *item = [self backItem:dict];
                    [backRow addObject:item];
                
                }
            }
        }
        [BackSectionAndRow addObject:backRow];  
    }
    
    return BackSectionAndRow;

}

这样，就已经可以返回排好序的item数组了