- (void)conversionCharacterInterval:(NSInteger)maxInteger current:(NSString *)currentString withLabel:(UILabel *)label

{

    CGRect rect = [[currentString substringToIndex:] boundingRectWithSize:CGSizeMake(,label.frame.size.height)

                                     options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading

                                  attributes:@{NSFontAttributeName: label.font}

                                     context:nil];

    NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:currentString];

    float strLength = [self getLengthOfString:currentString];

    [attrString addAttribute:NSKernAttributeName value:@(((maxInteger - strLength) * rect.size.width)/(strLength - )) range:NSMakeRange(, strLength)];

    label.attributedText = attrString;

}

-  (float)getLengthOfString:(NSString*)str {

    float strLength = ;

    char *p = (char *)[str cStringUsingEncoding:NSUnicodeStringEncoding];

    for (NSInteger i =  ; i < [str lengthOfBytesUsingEncoding:NSUnicodeStringEncoding]; i++) {

        if (*p) {

            strLength++;

        }

        p++;

    }

    return strLength/2;

}