I'm trying to add a number to the beginning of each row whenever the user enters a newline. I'd like the numbers to go in order (like in an ordered list), but with my current code, if the user does not add a new line at the end but instead adds the line in the middle of the I'm trying to add a number to the beginning of
阅读背景：
每个新行添加一个编号列表UITextView。
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