基于《iOS開發(fā)中如何更快的實現(xiàn)漢字轉(zhuǎn)拼音》

方法列舉

A. 最終版 項目中直接采用了這種方法抓歼，原因：處理速度快。

- (NSString *)transformToPinyin {
    NSMutableString *mutableString = [NSMutableString stringWithString:self];
    CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformToLatin, false);
    mutableString = (NSMutableString *)[mutableString stringByFoldingWithOptions:NSDiacriticInsensitiveSearch locale:[NSLocale currentLocale]];
    return [mutableString stringByReplacingOccurrencesOfString:@"'" withString:@""];
}

B. PinYin4Objc 項目中未采用此方法拢锹，因為該庫已不進(jìn)行維護(hù)

C. 網(wǎng)友推薦的方法

- (NSString *)transformToPinyin {
    NSMutableString *mutableString = [NSMutableString stringWithString:self];
    CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformToLatin, false);
    CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformStripDiacritics, false);
    return mutableString;
}

D. 正則表達(dá)式優(yōu)先過濾英文數(shù)字特殊字符等

- (NSString *)transformToPinyin {
    NSMutableString *mutableString = [NSMutableString stringWithString:self];
    BOOL isNeedTransform = ![self isAllEngNumAndSpecialSign];
    if (isNeedTransform) {
        CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformToLatin, false);
        CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformStripDiacritics, false);
    }
    return mutableString;
}
 
- (BOOL)isAllEngNumAndSpecialSign {
    NSString *regularString = @"^[A-Za-z0-9\\p{Z}\\p{P}]+$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regularString];
    return [predicate evaluateWithObject:self];
}

E. 參考NSHipster

- (NSString *)transformToPinyin {
    NSMutableString *mutableString = [NSMutableString stringWithString:self];
    BOOL isNeedTransform = ![self isAllEngNumAndSpecialSign];
    if (isNeedTransform) {
        CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformToLatin, false);
        CFStringTransform((CFMutableStringRef)mutableString, NULL, kCFStringTransformStripCombiningMarks, false);
    }
    return mutableString;
}
 
- (BOOL)isAllEngNumAndSpecialSign {
    NSString *regularString = @"^[A-Za-z0-9\\p{Z}\\p{P}]+$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regularString];
    return [predicate evaluateWithObject:self];
}

測試demo：CompareTransformDemo

-[ViewController pinyin4ObjC]: 0.185478
-[ViewController 最終版]: 0.602104
-[ViewController 網(wǎng)友推薦]: 12.419527
-[ViewController 正則表達(dá)式優(yōu)先過濾英文數(shù)字特殊字符等]: 13.215513
-[ViewController 參考NSHipster]: 7.774923

時間成本：PinYin4Objc < 最終版 << 其他方法

后續(xù)優(yōu)化

多音字處理

目前暫無好的辦法谣妻，可以手動列舉進(jìn)行處理，類似：

+ (NSString *)transformMandarinToLatin:(NSString *)hanzi {  /* 部分多音字處理 */
    NSString *pinyin = @"";
    if ([hanzi compare:@"長"] == NSOrderedSame) {
        pinyin = @"chang";
    } else if ([hanzi compare:@"沈"] == NSOrderedSame) {
        pinyin = @"shen";
    } else if ([hanzi compare:@"廈"] == NSOrderedSame) {
        pinyin = @"xia";
    } else if ([hanzi compare:@"地"] == NSOrderedSame) {
        pinyin = @"di";
    } else if ([hanzi compare:@"重"] == NSOrderedSame) {
        pinyin = @"chong";
    } else if ([hanzi compare:@"行"] == NSOrderedSame) {
        pinyin = @"xing";
    }
    return pinyin;
}

操作緩存

如果需要頻繁調(diào)用漢字轉(zhuǎn)拼音的方法(例如項目需求是通訊錄+索引面褐，每次處理顧客數(shù)據(jù)時都需要用到漢字轉(zhuǎn)拼音的方法)拌禾，可以考慮加上緩存，推薦使用 YYCache展哭。
思路：將處理過的項存入 cache 中湃窍，每次啟動時將數(shù)據(jù)從 diskCache 放入 memoryCache，同時不要忘記清除緩存時的處理匪傍。