Objective-C汉字转换成拼音的方法

开发中可能会用到，通讯录分组啥的~

-(NSString*)transChineseStringToPingyin:(NSString*)szString{
    if ([szString length]) {
        NSMutableString *ms = [[NSMutableString alloc] initWithString:szString];
        if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformMandarinLatin, NO)) {
        }
        if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO)) {
        }
        return ms;
    }
    return @"";
}