iOS 获取某个字符串或者汉字的首字母.

+ (NSString *)firstCharactorWithString:(NSString *)string{    NSMutableString *str = [NSMutableString stringWithString:string];    CFStringTransform((CFMutableStringRef) str, NULL, kCFStringTransformMandarinLatin, NO);    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);    NSString *pinYin = [str capitalizedString];    return [pinYin substringToIndex:1];}