如何获取汉字拼音首字母？一般用于通讯录

- (NSString *)firstCharactor:(NSString *)aString

{

    //转成了可变字符串

    NSMutableString *str = [NSMutableString stringWithString:aString];

    //先转换为带声调的拼音

    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformMandarinLatin,NO);

    //再转换为不带声调的拼音

    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformStripDiacritics,NO);

    //转化为大写拼音

    NSString *pinYin = [str capitalizedString];

    //获取并返回首字母

    return [pinYin substringToIndex:1];

}