IOS汉字转拼音首字母

项目中需要给UITableView建右侧索引，需要获取汉字的拼音首字母，而汉字转拼音一般都是使用CFStringTransform方法

- (NSString*)pinyin {if (self == nil || self.length == 0) {return @"";}NSMutableString *result = [NSMutableString stringWithString:self];//先转换为带声调的拼音CFStringTransform((CFMutableStringRef)result,NULL, kCFStringTransformMandarinLatin,NO);//再转换为不带声调的拼音CFStringTransform((CFMutableStringRef)result,NULL, kCFStringTransformStripDiacritics,NO);return [result uppercaseString];
}

然后获取首字母，但是该方法的效率不高，在三千多数据量的时候需要6秒多。在网上找到一个方法，效率很高

NSString+pinyin.h

#import <Foundation/Foundation.h>@interface NSString (pinyin)/**获取汉字拼音的首字母, 返回的字母是大写形式, 例如: @"俺妹", 返回 @"A".*如果字符串开头不是汉字, 而是字母, 则直接返回该字母, 例如: @"b彩票", 返回 @"B".*如果字符串开头不是汉字和字母, 则直接返回 @"#", 例如: @"&哈哈", 返回 @"#".*字符串开头有特殊字符(空格,换行)不影响判定, 例如@"       a啦啦啦", 返回 @"A".*/
- (NSString *)getFirstLetter;@end

NSString+pinyin.m

#import "NSString+pinyin.h"#define HANZI_START 19968
#define HANZI_COUNT 20902
static char firstLetterArray[HANZI_COUNT] =
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"cydyxyqmyqylddcyaytazdcymdydlzfffmmycqcwzzmabtbyctdmndzggdftypcgqyttssffwbdttqssystwnjhjytsxxylbyyhh"
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"xy";@implementation NSString (pinyin)- (NSString *)getFirstLetter
{NSString *words = [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];if (words.length == 0) {return nil;}NSString *result = nil;unichar firstLetter = [words characterAtIndex:0];int index = firstLetter - HANZI_START;if (index >= 0 && index <= HANZI_COUNT) {result = [NSString stringWithFormat:@"%c", firstLetterArray[index]];} else if ((firstLetter >= 'a' && firstLetter <= 'z')|| (firstLetter >= 'A' && firstLetter <= 'Z')) {result = [NSString stringWithFormat:@"%c", firstLetter];} else {result = @"#";}return [result uppercaseString];
}@end

该方法将所有汉字的首字母映射放到数组中，效率非常高，三千多条数据只需要几毫秒。
参考：http://rainbownight.blog.51cto.com/1336585/1368730/

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