- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {    NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];    NSString *regexStr = @"^\\d{0,3}$";        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self matches %@", regexStr];    if([predicate evaluateWithObject:text] && [text integerValue] <= 100){        return YES;    }    return NO;    }