RTLable 越界错误

command + f 搜索 int position 替换成下面的代码

int position = [data rangeOfString:delimiter options:NSCaseInsensitiveSearch range:NSMakeRange(last_position, [data length] - last_position)].location;
        if (position != NSNotFound && position >= last_position)
        {
            if ([delimiter rangeOfString:@"<p"].location==0)
            {
                data = [data stringByReplacingOccurrencesOfString:delimiter withString:paragraphReplacement options:NSCaseInsensitiveSearch range:NSMakeRange(position, delimiter.length)];
            }
            else
            {
                data = [data stringByReplacingOccurrencesOfString:delimiter withString:@"" options:NSCaseInsensitiveSearch range:NSMakeRange(position, delimiter.length)];
            }

            data = [data stringByReplacingOccurrencesOfString:@"&lt;" withString:@"<"];
            data = [data stringByReplacingOccurrencesOfString:@"&gt;" withString:@">"];
        }