汉字转拼音及截取首字母

  //NSMutableString *ms=@"老王";
   //将汉字转换为拼音
    CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformToLatin, NO);
    //将拼音的声调去掉
    CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO);
    //将字符串所有的字母大写
    NSString *upStr=[ms uppercaseString];
    //截取首字符
    NSString *firstStr=[upStr substringToIndex:1];