//获取拼音首字母

//获取拼音首字母
- (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);
    NSLog(@"%@", str);
    //再转换为不带声调的拼音
    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformStripDiacritics,NO);
    NSLog(@"%@", str);
    //先传化为拼音
    NSString *pinYin = [str capitalizedString];
    //获取首字母
    return [pinYin substringToIndex:1];
}