blocks|key|2713515|text|From+the+official+documentation|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2713516|2713517|+讨论|blockquote|style|BOLD|2713518|2713519|如果在options中指定了NSStringDrawingUsesLineFragmentOrigin，则它会根据需要对字符串文本进行换行以使其适合。如果字符串太大，无法完全放入矩形内，则该方法将缩放字体或调整字母间距，以使字符串适合给定的边界。|2713520|如果未在选项中指定NSStringDrawingUsesLineFragmentOrigin，则矩形的原点为唯一直线的基线。文本将显示在矩形上方，而不是矩形内部。例如，如果您指定一个从0,0开始的矩形，并绘制字符串‘’，则只会看到‘j’和‘p’的下级。文本的其余部分将位于矩形的顶部边缘。|2713521|此方法使用属性化字符串本身中指定的属性来绘制线条。如果字符串中存在换行符，则接受这些字符，并将后续文本放在起始点下的下一行上。|2713522|特殊注意事项此方法默认情况下使用基线原点，因此它将字符串呈现为单行。要在多行中呈现字符串，请在options.中指定NSStringDrawingUsesLineFragmentOrigin|2713523|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/reference/foundation/nsattributedstring/1524971-draw^0|0|V|0|0|0|1|2|0|0|E|11|0|9|11|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|-4|5|6|7|14|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|15|8|@$A|16|B|17|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|18|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|19|8|@$A|1A|B|1B|H|I]]|9|@]|C|$]]|$1|M|3|N|5|6|7|1C|8|@$A|1D|B|1E|H|I]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1F|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1G|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

<a href="https://developer.apple.com/reference/foundation/nsattributedstring/1524971-draw" rel="noreferrer">From the official documentation</a>

<blockquote>
 Discussion 
 
 If NSStringDrawingUsesLineFragmentOrigin is specified in
 options, it wraps the string text as needed to make it fit. If the
 string is too big to fit completely inside the rectangle, the method
 scales the font or adjusts the letter spacing to make the string fit
 within the given bounds.
 
 If NSStringDrawingUsesLineFragmentOrigin is not specified in options,
 the origin of the rectangle is the baseline of the only line. The text
 will be displayed above the rectangle and not inside of it. For
 example, if you specify a rectangle starting at 0,0 and draw the
 string ‘juxtaposed’, only the descenders of the ‘j’ and ‘p’ will be
 seen. The rest of the text will be on the top edge of the rectangle.
 
 This method draws the line using the attributes specified in the
 attributed string itself. If newline characters are present in the
 string, those characters are honored and cause subsequent text to be
 placed on the next line underneath the starting point.
 
 Special Considerations This method uses the baseline origin by
 default, so it renders the string as a single line. To render the
 string in multiple lines, specify
 NSStringDrawingUsesLineFragmentOrigin in options.
</blockquote>

iOS7 and later, we can use <code>- (void)drawWithRect:(CGRect)rect options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)context</code> to calculate the string size, but I'm confused with the comments on <code>NSStringDrawingOptions</code> enum.

NSStringDrawingUsesLineFragmentOrigin

It means specified origin is the line fragment origin, not the base line origin. But what mean of line fragment origin and baseline origin.

Just like the WWDC 2013 Session 220 (Advanced Text Layouts and Effects with Text Kit) PDF on Page 95.

If line fragment origin mean the blue dot, what the baseline origin?

Confused by NSStringDrawingOptions item meaning

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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之后，我们可以使用- (void)drawWithRect:(CGRect)rect options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)conte...

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问被NSStringDrawingOptions项目的含义弄糊涂了
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