将汉字转化为拼音的NSString类目category

8.25 将汉字转化为拼音的NSString类目category

//

//  NSString+Characters.h
#import <Foundation/Foundation.h>
@interface NSString (Characters)
//将汉字转换为拼音(无音标)

- (NSString *)pinyinOfString;
//汉字转换为拼音后，返回大写的首字母
- (NSString *)firstCharacterOfString;
@end



//
//  NSString+Characters.m
//  AddressBook
#import "NSString+Characters.h"
@implementation NSString (Characters)
//将汉字转换为拼音
- (NSString *)pinyinOfString
{
    NSMutableString * string = [[[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) string, &range, kCFStringTransformMandarinLatin, NO) ||
        ! CFStringTransform((__bridge CFMutableStringRef) string, &range, kCFStringTransformStripDiacritics, NO)) {
        return @"";
    }
    return string;
}
//汉字转换为拼音后，返回大写的首字母
- (NSString *)firstCharacterOfString
{
    NSMutableString * first = [[[NSMutableString alloc] initWithString:[self 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;
    result = [first substringWithRange:NSMakeRange(0, 1)];
    return result.uppercaseString;
}