朝闻道，夕死可矣。
OC学习之道:在实现通讯录的时候可能需要按姓名的首字母来分组,这里实现的就是把汉字转化为拼音并且是拼音首字母大写
这里提供了两种把汉字转化为拼音并且使拼音首字母大写的方法,
其中后面一种方法是来自一位外国的开发者提供的,关于他的代码名在代码注释里有//
NSString+Characters.h
Copyright (c) 2015年 tongxing. All rights reserved.
@interface NSString (Characters)
//-(NSString *)uppercaseFireL
//将汉字转换为拼音
- (NSString *)pinyinOfN
//汉字转换为拼音后，返回大写的首字母
- (NSString *)uppercasePinYinFirstL
NSString+Characters.m
Copyright (c) 2015年 tongxing. All rights reserved.
#import "NSString+Characters.h"
@implementation NSString (Characters)
//-(NSString *)uppercaseFireLet{
NSString *string = [[self substringToIndex:1]capitalizedString];
//讲汉字转换为拼音
- (NSString *)pinyinOfName
NSMutableString * name = [[[NSMutableString alloc] initWithString:self ] autorelease];
CFRange range = CFRangeMake(0, 1);
// 汉字转换为拼音,并去除音调
if ( ! CFStringTransform((__bridge CFMutableStringRef) name, &range, kCFStringTransformMandarinLatin, NO) ||
! CFStringTransform((__bridge CFMutableStringRef) name, &range, kCFStringTransformStripDiacritics, NO)) {
return @"";
//汉字转换为拼音后，返回大写的首字母
- (NSString *)uppercasePinYinFirstLetter
NSString *name = [self pinyinOfName];//也可以把上面的功能融合到一个功能
NSMutableString * first = [[[NSMutableString alloc] initWithString:[name substringWithRange:NSMakeRange(0, 1)]] autorelease];
CFRange range = CFRangeMake(0, 1);
// 汉字转换为拼音,并去除音调
if ( ! CFStringTransform((__bridge CFMutableStringRef) first, &range, kCFStringTransformMandarinLatin, NO) ||
! CFStringTransform((__bridge CFMutableStringRef) first, &range, kCFStringTransformStripDiacritics, NO)) {
return @"";
NSString *
result = [first substringWithRange:NSMakeRange(0, 1)];
return result.uppercaseS
Chinese Pinyin First Letter
Created by George on 4/21/10.
Copyright 2010 RED/SAFI. All rights reserved.
#define ALPHA @"ABCDEFGHIJKLMNOPQRSTUVWXYZ#"
char pinyinFirstLetter(unsigned short hanzi);
@interface NSString(FirstLetter)
- (NSString *) uppercasePinYinFirstL
- (NSString *) lowercasePinYinFirstL
Chinese Pinyin First Letter
Created by George on 4/21/10.
Copyright 2010 RED/SAFI. All rights reserved.
#import "pinyin.h"
#define HANZI_START 19968
#define HANZI_COUNT 20902
static char firstLetterArray[HANZI_COUNT] =
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char pinyinFirstLetter(unsigned short hanzi)
int index = hanzi - HANZI_START;
if (index &= 0 && index &= HANZI_COUNT)
return firstLetterArray[index];
@implementation NSString(FirstLetter)
- (NSString *) uppercasePinYinFirstLetter
unichar firstLetter = [self characterAtIndex:0];
char cFirstLetter = pinyinFirstLetter(firstLetter);
return [[NSString stringWithFormat:@"%c",cFirstLetter] uppercaseString];
- (NSString *) lowercasePinYinFirstLetter
unichar firstLetter = [self characterAtIndex:0];
char cFirstLetter = pinyinFirstLetter(firstLetter);
return [[NSString stringWithFormat:@"%c",cFirstLetter] lowercaseString];
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