blocks|key|208786|text|看起来你没有提供正确的选项。对于包装标签，至少要提供：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|208787|CGRect+paragraphRect+=
++[attributedText+boundingRectWithSize:CGSizeMake(300.f,+CGFLOAT_MAX)
++options:(NSStringDrawingUsesLineFragmentOrigin%7CNSStringDrawingUsesFontLeading)
++context:nil];|code-block|syntax|javascript|208788|注意:如果原始文本宽度小于300。f将不会有换行，因此请确保装订大小正确，否则仍然会得到错误的结果。|208789|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Looks like you weren't providing the correct options. For wrapping labels, provide at least:

<pre><code>CGRect paragraphRect =
 [attributedText boundingRectWithSize:CGSizeMake(300.f, CGFLOAT_MAX)
 options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
 context:nil];
</code></pre>

Note: if the original text width is under 300.f there won't be line wrapping, so make sure the bound size is correct, otherwise you will still get wrong results.

blocks|key|426917|text|我也遇到过同样的问题，无法使用这些技术获得准确的大小，我已经改变了我的方法来使其工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|426918|我有一个很长的属性字符串，我一直在尝试将它放入滚动视图中，以便正确显示而不会被截断。我所做的是让文本可靠地工作，而不是将高度设置为约束，而是允许固有大小接管。现在，文本可以正确显示，而不会被截断，我也不必计算高度。|426919|我想，如果我确实需要可靠地获得高度，我会创建一个隐藏的视图和这些约束，并在应用这些约束后获得框架的高度。|426920|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I have had the same problem with not getting an accurate size using these techniques and I've changed my approach to make it work. 

I have a long attributed string which I've been trying to fit into a scroll view so that it shows properly without being truncated. What I did to make the text work reliably was to not set the height at all as a constraint and instead allowed the intrinsic size to take over. Now the text is displayed correctly without being truncated and I do not have to calculate the height.

I suppose if I did need to get the height reliably I would create a view which is hidden and these constraints and get the height of the frame once the constraints are applied.

blocks|key|208857|text|++++NSAttributedString+*attributedText+=[[[NSAttributedString+alloc]
++++++++++++++++++++++++++++++++++++++++++initWithString:joyMeComment.content
++++++++++++++++++++++++++++++++++++++++++attributes:@{+NSFontAttributeName:+[UIFont+systemFontOfSize:TextFont]}]+autorelease];

++++CGRect+paragraphRect+=
++++[attributedText+boundingRectWithSize:CGSizeMake(kWith,+CGFLOAT_MAX)
+++++++++++++++++++++++++++++++++options:(NSStringDrawingUsesLineFragmentOrigin%7CNSStringDrawingUsesFontLeading)
+++++++++++++++++++++++++++++++++context:nil];
++++contentSize+=+paragraphRect.size;

++++contentSize.size.height%2B=10;
++++label.frame=contentSize;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|208858|如果标签的框架不加10，这个方法永远不会起作用！希望这能对你有所帮助！祝你好运。|unstyled|208859|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> NSAttributedString *attributedText =[[[NSAttributedString alloc]
 initWithString:joyMeComment.content
 attributes:@{ NSFontAttributeName: [UIFont systemFontOfSize:TextFont]}] autorelease];

 CGRect paragraphRect =
 [attributedText boundingRectWithSize:CGSizeMake(kWith, CGFLOAT_MAX)
 options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
 context:nil];
 contentSize = paragraphRect.size;

 contentSize.size.height+=10;
 label.frame=contentSize;
</code></pre>

if label's frame not add 10 this method will never work! hope this can help you! goog luck.

blocks|key|426965|text|我也有同样的问题，但我意识到高度约束设置是正确的。因此，我做了以下工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|426966|-(CGSize)MaxHeighForTextInRow:(NSString+*)RowText+width:(float)UITextviewWidth+{

++++CGSize+constrainedSize+=+CGSizeMake(UITextviewWidth,+CGFLOAT_MAX);

++++NSDictionary+*attributesDictionary+=+[NSDictionary+dictionaryWithObjectsAndKeys:
++++++++++++++++++++++++++++++++++++++++++[UIFont+fontWithName:@"HelveticaNeue"+size:11.0],+NSFontAttributeName,
++++++++++++++++++++++++++++++++++++++++++nil];

++++NSMutableAttributedString+*string+=+[[NSMutableAttributedString+alloc]+initWithString:RowText+attributes:attributesDictionary];

++++CGRect+requiredHeight+=+[string+boundingRectWithSize:constrainedSize+options:NSStringDrawingUsesLineFragmentOrigin+context:nil];

++++if+(requiredHeight.size.width+>+UITextviewWidth)+{
++++++++requiredHeight+=+CGRectMake(0,+0,+UITextviewWidth,+requiredHeight.size.height);
++++}

++++return+requiredHeight.size;
}|code-block|syntax|javascript|426967|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I had the same problem, but I recognised that height constrained has been set correctly. So I did the following:

<pre><code>-(CGSize)MaxHeighForTextInRow:(NSString *)RowText width:(float)UITextviewWidth {

 CGSize constrainedSize = CGSizeMake(UITextviewWidth, CGFLOAT_MAX);

 NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
 [UIFont fontWithName:@"HelveticaNeue" size:11.0], NSFontAttributeName,
 nil];

 NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:RowText attributes:attributesDictionary];

 CGRect requiredHeight = [string boundingRectWithSize:constrainedSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];

 if (requiredHeight.size.width &gt; UITextviewWidth) {
 requiredHeight = CGRectMake(0, 0, UITextviewWidth, requiredHeight.size.height);
 }

 return requiredHeight.size;
}
</code></pre>

blocks|key|208902|text|我想补充我的想法，因为我有完全相同的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|208903|我之所以使用UITextView，是因为它具有更好的文本对齐方式(justify，当时在UILabel中还不可用)，但为了“模拟”非交互式、不可滚动的UILabel，我会完全关闭滚动、跳转和用户交互。|offset|length|style|CODE|208904|当然，问题是文本是动态的，虽然宽度是固定的，但每次我设置新的文本值时，高度都应该重新计算。|208905|boundingRectWithSize对我来说一点也不好用，从我看到的情况来看，UITextView在上面添加了一些空白，boundingRectWithSize不会将其计入计数中，因此，从boundingRectWithSize检索到的高度比它应该的高度要小。|208906|由于文本不会快速更新，它只是用于一些最多每2-3秒更新一次的信息，我决定采用以下方法：|208907|/*+This+f+is+nested+in+a+custom+UIView-inherited+class+that+is+built+using+xib+file+*/
-(void)+setTextAndAutoSize:(NSString*)text+inTextView:(UITextView*)tv
{
++++CGFloat+msgWidth+=+tv.frame.size.width;+//+get+target's+width

++++//+Make+"test"+UITextView+to+calculate+correct+size
++++UITextView+*temp+=+[[UITextView+alloc]+initWithFrame:CGRectMake(0,+0,+msgWidth,+300)];+//+we+set+some+height,+really+doesn't+matter,+just+put+some+value+like+this+one.
++++//+Set+all+font+and+text+related+parameters+to+be+exact+as+the+ones+in+targeted+text+view
++++[temp+setFont:tv.font];
++++[temp+setTextAlignment:tv.textAlignment];
++++[temp+setTextColor:tv.textColor];
++++[temp+setText:text];

++++//+Ask+for+size+that+fits+:P
++++CGSize+tv_size+=+[temp+sizeThatFits:CGSizeMake(msgWidth,+300)];

++++//+kill+this+"test"+UITextView,+it's+purpose+is+over
++++[temp+release];
++++temp+=+nil;

++++//+apply+calculated+size.+if+calcualted+width+differs,+I+choose+to+ignore+it+anyway+and+use+only+height+because+I+want+to+have+width+absolutely+fixed+to+designed+value
++++tv.frame+=+CGRectMake(tv.frame.origin.x,+tv.frame.origin.y,+msgWidth,+tv_size.height+);
}|code-block|syntax|javascript|208908|*上面的代码不是直接从我的源代码复制的，我必须调整它/从本文不需要的一堆其他东西中清除它。不要把它当做复制-粘贴-并将其工作的代码。|208909|明显的缺点是，对于每个调用，它都有alloc和release。|208910|但是，优点是您可以避免依赖于boundingRectWithSize绘制文本的方式和计算文本大小与UITextView中的文本绘制实现之间的兼容性(或者UILabel，您也可以使用它，只需将UITextView替换为UILabel)。这样就避免了苹果可能存在的任何“bug”。|208911|附注:看起来你不应该需要这个“临时”UITextView，可以直接从目标请求sizeThatFits，但是这对我不起作用。虽然逻辑上会说它应该可以工作，并且不需要分配/释放临时UITextView，但它并没有。但是，这个解决方案对于我要输入的任何文本都能完美地工作。|208912|entityMap^0|0|6|A|18|7|23|7|0|0|0|K|15|A|1Q|K|2O|K|0|0|0|0|0|1D|A|24|7|2N|A|30|7|0|I|A|12|C|2G|A|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@$D|14|E|15|F|G]|$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1B|8|@$D|1C|E|1D|F|G]|$D|1E|E|1F|F|G]|$D|1G|E|1H|F|G]|$D|1I|E|1J|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1K|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1L|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1M|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1N|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1O|8|@$D|1P|E|1Q|F|G]|$D|1R|E|1S|F|G]|$D|1T|E|1U|F|G]|$D|1V|E|1W|F|G]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1X|8|@$D|1Y|E|1Z|F|G]|$D|20|E|21|F|G]|$D|22|E|23|F|G]]|9|@]|A|$]]|$1|10|3|-4|5|6|7|24|8|@]|9|@]|A|$]]]|11|$]]

I'd like to add my thoughts since I had exactly the same problem.

I was using <code>UITextView</code> since it had nicer text alignment (justify, which at the time was not available in <code>UILabel</code>), but in order to "simulate" non-interactive-non-scrollable <code>UILabel</code>, I'd switch off completely scrolling, bouncing, and user interaction.

Of course, problem was that text was dynamic, and while width would be fixed, height should be recalculated every time I'd set new text value.

<code>boundingRectWithSize</code> didn't work well for me at all, from what I could see, <code>UITextView</code> was adding some margin on top which <code>boundingRectWithSize</code> would not get into a count, hence, height retrieved from <code>boundingRectWithSize</code> was smaller than it should be.

Since text was not to be updated rapidly, it's just used for some information that may update every 2-3 seconds the most, I've decided following approach:

<pre><code>/* This f is nested in a custom UIView-inherited class that is built using xib file */
-(void) setTextAndAutoSize:(NSString*)text inTextView:(UITextView*)tv
{
 CGFloat msgWidth = tv.frame.size.width; // get target's width

 // Make "test" UITextView to calculate correct size
 UITextView *temp = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, msgWidth, 300)]; // we set some height, really doesn't matter, just put some value like this one.
 // Set all font and text related parameters to be exact as the ones in targeted text view
 [temp setFont:tv.font];
 [temp setTextAlignment:tv.textAlignment];
 [temp setTextColor:tv.textColor];
 [temp setText:text];

 // Ask for size that fits :P
 CGSize tv_size = [temp sizeThatFits:CGSizeMake(msgWidth, 300)];

 // kill this "test" UITextView, it's purpose is over
 [temp release];
 temp = nil;

 // apply calculated size. if calcualted width differs, I choose to ignore it anyway and use only height because I want to have width absolutely fixed to designed value
 tv.frame = CGRectMake(tv.frame.origin.x, tv.frame.origin.y, msgWidth, tv_size.height );
}
</code></pre>

*Above code is not directly copied from my source, I had to adjust it / clear it from bunch of other stuff not needed for this article. Don't take it for copy-paste-and-it-will-work-code.

Obvious disadvantage is that it has alloc and release, for each call. 

But, advantage is that you avoid depending on compatibility between how boundingRectWithSize draws text and calculates it's size and implementation of text drawing in <code>UITextView</code> (or <code>UILabel</code> which also you can use just replace <code>UITextView</code> with <code>UILabel</code>). Any "bugs" that Apple may have are this way avoided.

P.S. It would seem that you shouldn't need this "temp" <code>UITextView</code> and can just ask <code>sizeThatFits</code> directly from target, however that didn't work for me. Though logic would say it should work and alloc/release of temporary <code>UITextView</code> are not needed, it did not. But this solution worked flawlessly for any text I would set in.

blocks|key|427094|text|@warrenm抱歉地说，framesetter方法对我不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|427095|我得到的this.This函数可以帮助我们确定iphone/Ipad+SDK中给定宽度的NSAttributedString字符串范围所需的帧大小：|427096|它可以用于UITableView单元格的动态高度|427097|-+(CGSize)frameSizeForAttributedString:(NSAttributedString+*)attributedString
{
++++CTTypesetterRef+typesetter+=+CTTypesetterCreateWithAttributedString((CFAttributedStringRef)attributedString);
++++CGFloat+width+=+YOUR_FIXED_WIDTH;

++++CFIndex+offset+=+0,+length;
++++CGFloat+y+=+0;
++++do+{
++++++++length+=+CTTypesetterSuggestLineBreak(typesetter,+offset,+width);
++++++++CTLineRef+line+=+CTTypesetterCreateLine(typesetter,+CFRangeMake(offset,+length));

++++++++CGFloat+ascent,+descent,+leading;
++++++++CTLineGetTypographicBounds(line,+&ascent,+&descent,+&leading);

++++++++CFRelease(line);

++++++++offset+%2B=+length;
++++++++y+%2B=+ascent+%2B+descent+%2B+leading;
++++}+while+(offset+<+[attributedString+length]);

++++CFRelease(typesetter);

++++return+CGSizeMake(width,+ceil(y));
}|code-block|syntax|javascript|427098|感谢HADDAD+ISSA+>>>+http://haddadissa.blogspot.in/2010/09/compute-needed-heigh-for-fixed-width-of.html|offset|length|427099|entityMap|0|LINK|mutability|MUTABLE|url|http://haddadissa.blogspot.in/2010/09/compute-needed-heigh-for-fixed-width-of.html^0|0|0|0|0|I|2A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

@warrenm Sorry to say that framesetter method didn't work for me.

I got this.This function can help us to determine the frame size needed for a string range of an NSAttributedString in iphone/Ipad SDK for a given Width :

It can be used for a dynamic height of UITableView Cells

<pre><code>- (CGSize)frameSizeForAttributedString:(NSAttributedString *)attributedString
{
 CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedString((CFAttributedStringRef)attributedString);
 CGFloat width = YOUR_FIXED_WIDTH;

 CFIndex offset = 0, length;
 CGFloat y = 0;
 do {
 length = CTTypesetterSuggestLineBreak(typesetter, offset, width);
 CTLineRef line = CTTypesetterCreateLine(typesetter, CFRangeMake(offset, length));

 CGFloat ascent, descent, leading;
 CTLineGetTypographicBounds(line, &amp;ascent, &amp;descent, &amp;leading);

 CFRelease(line);

 offset += length;
 y += ascent + descent + leading;
 } while (offset &lt; [attributedString length]);

 CFRelease(typesetter);

 return CGSizeMake(width, ceil(y));
}
</code></pre>

Thanks to HADDAD ISSA >>> <a href="http://haddadissa.blogspot.in/2010/09/compute-needed-heigh-for-fixed-width-of.html" rel="noreferrer">http://haddadissa.blogspot.in/2010/09/compute-needed-heigh-for-fixed-width-of.html</a>

blocks|key|208943|text|textView.textContainerInset+=+UIEdgeInsetsZero;
NSString+*string+=+@"Some+string";
NSDictionary+*attributes+=+@{NSFontAttributeName:[UIFont+systemFontOfSize:12.0f],+NSForegroundColorAttributeName:[UIColor+blackColor]};
NSAttributedString+*attributedString+=+[[NSAttributedString+alloc]+initWithString:string+attributes:attributes];
[textView+setAttributedText:attributedString];
CGRect+textViewFrame+=+[textView.attributedText+boundingRectWithSize:CGSizeMake(CGRectGetWidth(self.view.frame)-8.0f,+9999.0f)+options:(NSStringDrawingUsesLineFragmentOrigin%7CNSStringDrawingUsesFontLeading)+context:nil];
NSLog(@"%25f",+ceilf(textViewFrame.size.height));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|208944|完美地工作在所有字体上！|unstyled|208945|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre class="lang-c prettyprint-override"><code>textView.textContainerInset = UIEdgeInsetsZero;
NSString *string = @"Some string";
NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:12.0f], NSForegroundColorAttributeName:[UIColor blackColor]};
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:string attributes:attributes];
[textView setAttributedText:attributedString];
CGRect textViewFrame = [textView.attributedText boundingRectWithSize:CGSizeMake(CGRectGetWidth(self.view.frame)-8.0f, 9999.0f) options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) context:nil];
NSLog(@"%f", ceilf(textViewFrame.size.height));
</code></pre>

Works on all fonts perfectly!

blocks|key|208984|text|++++NSDictionary+*stringAttributes+=+[NSDictionary+dictionaryWithObjectsAndKeys:
++++++++++++++++++++++++++++++++++++++[UIFont+systemFontOfSize:18],+NSFontAttributeName,
++++++++++++++++++++++++++++++++++++++[UIColor+blackColor],+NSForegroundColorAttributeName,
++++++++++++++++++++++++++++++++++++++nil];

++++NSAttributedString+*attributedString+=+[[NSAttributedString+alloc]+initWithString:myLabel.text+attributes:stringAttributes];
++++myLabel.attributedText+=+attributedString;+//this+is+the+key!

++++CGSize+maximumLabelSize+=+CGSizeMake+(screenRect.size.width+-+40,+CGFLOAT_MAX);

++++CGRect+newRect+=+[myLabel.text+boundingRectWithSize:maximumLabelSize
+++++++++++++++++++++++++++++++++++++++++++++++++++++++options:(NSStringDrawingUsesLineFragmentOrigin%7CNSStringDrawingUsesFontLeading)
++++++++++++++++++++++++++++++++++++++++++++++++++++attributes:stringAttributes+context:nil];

++++self.myLabelHeightConstraint.constant+=+ceilf(newRect.size.height);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|208985|我尝试了这个页面上的所有东西，但仍然有一个UILabel的格式不正确。实际上，在标签上设置attributedText最终解决了这个问题。|unstyled|208986|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> NSDictionary *stringAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
 [UIFont systemFontOfSize:18], NSFontAttributeName,
 [UIColor blackColor], NSForegroundColorAttributeName,
 nil];

 NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:myLabel.text attributes:stringAttributes];
 myLabel.attributedText = attributedString; //this is the key!

 CGSize maximumLabelSize = CGSizeMake (screenRect.size.width - 40, CGFLOAT_MAX);

 CGRect newRect = [myLabel.text boundingRectWithSize:maximumLabelSize
 options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
 attributes:stringAttributes context:nil];

 self.myLabelHeightConstraint.constant = ceilf(newRect.size.height);
</code></pre>

I tried everything on this page and still had one case for a UILabel that was not formatting correctly. Actually setting the attributedText on the label finally fixed the problem.

blocks|key|209002|text|如果你想通过截断尾部来获得边界框，this+question可以帮助你。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|209003|CGFloat+maxTitleWidth+=+200;

NSMutableParagraphStyle+*paragraph+=+[[NSMutableParagraphStyle+alloc]+init];
paragraph.lineBreakMode+=+NSLineBreakByTruncatingTail;

NSDictionary+*attributes+=+@{NSFontAttributeName+:+self.textLabel.font,
+++++++++++++++++++++++++++++NSParagraphStyleAttributeName:+paragraph};

CGRect+box+=+[self.textLabel.text
++++++++++++++boundingRectWithSize:CGSizeMake(maxTitleWidth,+CGFLOAT_MAX)
++++++++++++++options:(NSStringDrawingUsesLineFragmentOrigin+%7C+NSStringDrawingUsesFontLeading)
++++++++++++++attributes:attributes+context:nil];|code-block|syntax|javascript|209004|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/20631464/how-to-specify-nslinebreakmode-in-boundingrectwithsize^0|H|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

In case you'd like to get bounding box by truncating the tail, <a href="https://stackoverflow.com/questions/20631464/how-to-specify-nslinebreakmode-in-boundingrectwithsize">this question</a> can help you out.

<pre><code>CGFloat maxTitleWidth = 200;

NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
paragraph.lineBreakMode = NSLineBreakByTruncatingTail;

NSDictionary *attributes = @{NSFontAttributeName : self.textLabel.font,
 NSParagraphStyleAttributeName: paragraph};

CGRect box = [self.textLabel.text
 boundingRectWithSize:CGSizeMake(maxTitleWidth, CGFLOAT_MAX)
 options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading)
 attributes:attributes context:nil];
</code></pre>

blocks|key|427237|text|由于某些原因，boundingRectWithSize总是返回错误的大小。我想出了一个解决方案。有一个用于UItextView+-sizeThatFits的方法，它返回文本集的适当大小。因此，不使用boundingRectWithSize，而是创建一个具有随机帧的UITextView，并使用相应的宽度和CGFLOAT_MAX高度调用其sizeThatFits。它返回具有适当高度的大小。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|427238|+++UITextView+*view=[[UITextView+alloc]+initWithFrame:CGRectMake(0,+0,+width,+10)];+++
+++view.text=text;
+++CGSize+size=[view+sizeThatFits:CGSizeMake(width,+CGFLOAT_MAX)];
+++height=size.height;+|code-block|syntax|javascript|427239|如果你在while循环中计算大小，不要忘了在自动释放池中添加，因为将有n个UITextView创建，如果我们不使用自动释放池，应用程序的运行时内存将增加。|427240|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For some reason, boundingRectWithSize always returns wrong size.
I figured out a solution.
There is a method for UItextView -sizeThatFits which returns the proper size for the text set.
So instead of using boundingRectWithSize, create an UITextView, with a random frame, and call its sizeThatFits with the respective width and CGFLOAT_MAX height.
It returns the size that will have the proper height.

<pre><code> UITextView *view=[[UITextView alloc] initWithFrame:CGRectMake(0, 0, width, 10)]; 
 view.text=text;
 CGSize size=[view sizeThatFits:CGSizeMake(width, CGFLOAT_MAX)];
 height=size.height; 
</code></pre>

If you are calculating the size in a while loop, do no forget to add that in an autorelease pool, as there will be n number of UITextView created, the run time memory of the app will increase if we do not use autoreleasepool.

blocks|key|427286|text|我注意到的一件事是，从(CGRect)boundingRectWithSize:(CGSize)size+options:(NSStringDrawingOptions)options+attributes:(NSDictionary+*)attributes+context:(NSStringDrawingContext+*)context返回的rect的宽度比我传入的要大。当发生这种情况时，我的字符串将被截断。我是这样解决的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|427287|NSString+*aLongString+=+...
NSInteger+width+=+//some+width;++++++++++++
UIFont+*font+=+//your+font;
CGRect+rect+=+[aLongString+boundingRectWithSize:CGSizeMake(width,+CGFLOAT_MAX)
++++++++++++++++++++++++++++++++++++++++options:(NSStringDrawingUsesFontLeading+%7C+NSStringDrawingUsesLineFragmentOrigin)
+++++++++++++++++++++++++++++++++++++attributes:@{+NSFontAttributeName+:+font,
+++++++++++++++++++++++++++++++++++++++++++++++++++NSForegroundColorAttributeName+:+[UIColor+whiteColor]}
++++++++++++++++++++++++++++++++++++++++context:nil];

if(rect.size.width+>+width)
{
++++return+rect.size.height+%2B+font.lineHeight;
}
return+rect.size.height;|code-block|syntax|javascript|427288|对于更多的上下文；我有多行文本，我正在尝试找到合适的高度来显示它。boundRectWithSize有时返回的宽度大于我指定的宽度，因此当我使用以前的宽度和计算出的高度来显示文本时，它会被截断。根据测试，当boundingRectWithSize使用了错误的宽度时，它会使高度缩短1行。因此，我将检查宽度是否较大，如果是，则添加字体的lineHeight以提供足够的空间来避免截断。|427289|entityMap^0|B|4H|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

One thing I was noticing is that the rect that would come back from <code>(CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)context</code> would have a larger width than what I passed in. When this happened my string would be truncated. I resolved it like this:

<pre><code>NSString *aLongString = ...
NSInteger width = //some width; 
UIFont *font = //your font;
CGRect rect = [aLongString boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX)
 options:(NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin)
 attributes:@{ NSFontAttributeName : font,
 NSForegroundColorAttributeName : [UIColor whiteColor]}
 context:nil];

if(rect.size.width &gt; width)
{
 return rect.size.height + font.lineHeight;
}
return rect.size.height;
</code></pre>

For some more context; I had multi line text and I was trying to find the right height to display it in. boundRectWithSize was sometimes returning a width larger than what I would specify, thus when I used my past in width and the calculated height to display my text, it would truncate. From testing when boundingRectWithSize used the wrong width the amount it would make the height short by was 1 line. So I would check if the width was greater and if so add the font's lineHeight to provide enough space to avoid truncation.

blocks|key|209153|text|我在这些建议中没有任何一个是幸运的。我的字符串包含unicode项目符号，我怀疑它们会在计算中造成麻烦。我注意到UITextView可以很好地处理绘图，所以我希望利用它的计算。我做了以下工作，这可能没有NSString绘图方法那么理想，但至少它是准确的。与仅仅为了调用-sizeThatFits:而初始化UITextView相比，它也稍微更优化一些。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|209154|NSTextContainer+*textContainer+=+[[NSTextContainer+alloc]+initWithSize:CGSizeMake(width,+CGFLOAT_MAX)];
NSLayoutManager+*layoutManager+=+[[NSLayoutManager+alloc]+init];
[layoutManager+addTextContainer:textContainer];

NSTextStorage+*textStorage+=+[[NSTextStorage+alloc]+initWithAttributedString:formattedString];
[textStorage+addLayoutManager:layoutManager];

const+CGFloat+formattedStringHeight+=+ceilf([layoutManager+usedRectForTextContainer:textContainer].size.height);|code-block|syntax|javascript|209155|entityMap^0|3Q|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I didn't have luck with any of these suggestions. My string contained unicode bullet points and I suspect they were causing grief in the calculation. I noticed UITextView was handling the drawing fine, so I looked to that to leverage its calculation. I did the following, which is probably not as optimal as the NSString drawing methods, but at least it's accurate. It's also slightly more optimal than initialising a UITextView just to call <code>-sizeThatFits:</code>.

<pre><code>NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:CGSizeMake(width, CGFLOAT_MAX)];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
[layoutManager addTextContainer:textContainer];

NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:formattedString];
[textStorage addLayoutManager:layoutManager];

const CGFloat formattedStringHeight = ceilf([layoutManager usedRectForTextContainer:textContainer].size.height);
</code></pre>

blocks|key|209196|text|我发现首选的解决方案不处理换行符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|209197|我发现这种方法在所有情况下都有效：|209198|UILabel*+dummyLabel+=+[UILabel+new];
[dummyLabel+setFrame:CGRectMake(0,+0,+desiredWidth,+CGFLOAT_MAX)];
dummyLabel.numberOfLines+=+0;
[dummyLabel+setLineBreakMode:NSLineBreakByWordWrapping];
dummyLabel.attributedText+=+myString;
[dummyLabel+sizeToFit];
CGSize+requiredSize+=+dummyLabel.frame.size;|code-block|syntax|javascript|209199|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I've found that the preferred solution does not handle line breaks.

I've found this approach works in all cases:

<pre><code>UILabel* dummyLabel = [UILabel new];
[dummyLabel setFrame:CGRectMake(0, 0, desiredWidth, CGFLOAT_MAX)];
dummyLabel.numberOfLines = 0;
[dummyLabel setLineBreakMode:NSLineBreakByWordWrapping];
dummyLabel.attributedText = myString;
[dummyLabel sizeToFit];
CGSize requiredSize = dummyLabel.frame.size;
</code></pre>

blocks|key|427359|text|Add+Following+methods+in+ur+code+for+getting+correct+size+of+attribute+string+
1.
++++-+(CGFloat)findHeightForText:(NSAttributedString+*)text+havingWidth:(CGFloat)widthValue+andFont:(UIFont+*)font
+{
++++UITextView+*textView+=+[[UITextView+alloc]+init];
++++[textView+setAttributedText:text];
++++[textView+setFont:font];
++++CGSize+size+=+[textView+sizeThatFits:CGSizeMake(widthValue,+FLT_MAX)];
++++return+size.height;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|427360|}|unstyled|427361|2.+Call+on+heightForRowAtIndexPath+method
+++++int+h+=+[self+findHeightForText:attrString+havingWidth:yourScreenWidth+andFont:urFont];|427362|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>Add Following methods in ur code for getting correct size of attribute string 
1.
 - (CGFloat)findHeightForText:(NSAttributedString *)text havingWidth:(CGFloat)widthValue andFont:(UIFont *)font
 {
 UITextView *textView = [[UITextView alloc] init];
 [textView setAttributedText:text];
 [textView setFont:font];
 CGSize size = [textView sizeThatFits:CGSizeMake(widthValue, FLT_MAX)];
 return size.height;
</code></pre>

}

<pre><code>2. Call on heightForRowAtIndexPath method
 int h = [self findHeightForText:attrString havingWidth:yourScreenWidth andFont:urFont];
</code></pre>

blocks|key|209221|text|我来的有点晚--但我一直在尝试找到一种方法，找到适合属性字符串的边界框，使其成为焦点环，就像在Finder中编辑文件一样。当字符串末尾有空格或字符串中有多个空格时，我尝试的所有操作都失败了。与CTFramesetterCreateWithAttributedString一样，boundingRectWithSize在这一点上也失败了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|209222|使用NSLayoutManager，下面的代码似乎在我到目前为止发现的所有情况下都能做到这一点，并返回一个完美绑定字符串的rect。额外的好处:如果你选择了文本，那么选择的边缘就会一直延伸到返回的矩形的边界。下面的代码使用来自NSTextView的layoutManager。|209223|NSLayoutManager*+layout+=+[self+layoutManager];
NSTextContainer*+container+=+[self+textContainer];

CGRect+focusRingFrame+=+[layout+boundingRectForGlyphRange:NSMakeRange(0,+[[self+textStorage]+length])+inTextContainer:container];|code-block|syntax|javascript|209224|entityMap^0|2O|13|3U|K|0|2|F|35|A|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

Im a little late to the game - but I have been trying to figure out a way that works to find the bounding box that will fit around an attributed string to make a focus ring like editing a file in Finder does. everything I had tried failed when there are spaces at the end of the string or multiple spaces inside the string. <code>boundingRectWithSize</code> fails miserably for this as well as <code>CTFramesetterCreateWithAttributedString</code>. 

Using a <code>NSLayoutManager</code> the following code seems to do the trick in all the cases I have found so far and returns a rect that perfectly bounds the string. Bonus: if you select the text the edges of the selection go right up to the bounds of the rect returned. The code below uses the layoutManager from a <code>NSTextView</code>.

<pre><code>NSLayoutManager* layout = [self layoutManager];
NSTextContainer* container = [self textContainer];

CGRect focusRingFrame = [layout boundingRectForGlyphRange:NSMakeRange(0, [[self textStorage] length]) inTextContainer:container];
</code></pre>

blocks|key|427420|text|事实证明，NSAttributedString的每个部分都必须有一个至少包含NSFontAttributeName和NSForegroundColorAttributeName集的字典集，如果您希望boundingRectWithSize实际工作的话！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|427421|我在任何地方都没有看到这方面的记录。|427422|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Turns out that EVERY part of an NSAttributedString must have a dictionary set with at least NSFontAttributeName and NSForegroundColorAttributeName set, if you wish boundingRectWithSize to actually work! 

I don't see that documented anywhere.

blocks|key|427454|text|好的，我花了很多时间来调试它。我发现boundingRectWithSize允许通过我的UITextView显示文本的最大文本高度低于框架大小。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|427455|在我的例子中，帧最多为140pt，但UITextView最多支持131pt的文本。|427456|我不得不手动解决这个问题，并硬编码“真正”的最大高度。|427457|以下是我的解决方案：|427458|-+(BOOL)textView:(UITextView+*)textView+shouldChangeTextInRange:(NSRange)range+replacementText:(NSString+*)text+{
++++NSString+*proposedText+=+[textView.text+stringByReplacingCharactersInRange:range+withString:text];
++++NSMutableAttributedString+*attributedText+=+[[NSMutableAttributedString+alloc]+initWithString:proposedText];
++++CGRect+boundingRect;
++++CGFloat+maxFontSize+=+100;
++++CGFloat+minFontSize+=+30;
++++CGFloat+fontSize+=+maxFontSize+%2B+1;
++++BOOL+fit;
++++NSLog(@"Trying+text:+\"%25@\"",+proposedText);
++++do+{
++++++++fontSize+-=+1;
++++++++//XXX+Seems+like+trailing+whitespaces+count+for+0.+find+a+workaround
++++++++[attributedText+addAttribute:NSFontAttributeName+value:[textView.font+fontWithSize:fontSize]+range:NSMakeRange(0,+attributedText.length)];
++++++++CGFloat+padding+=+textView.textContainer.lineFragmentPadding;
++++++++CGSize+boundingSize+=+CGSizeMake(textView.frame.size.width+-+padding+*+2,+CGFLOAT_MAX);
++++++++boundingRect+=+[attributedText+boundingRectWithSize:boundingSize+options:NSStringDrawingUsesLineFragmentOrigin%7CNSStringDrawingUsesFontLeading+context:nil];
++++++++NSLog(@"bounding+rect+for+font+%25f+is+%25@;+(max+is+%25f+%25f).+Padding:+%25f",+fontSize,+NSStringFromCGRect(boundingRect),+textView.frame.size.width,+148.0,+padding);
++++++++fit+=++boundingRect.size.height+<=+131;
++++}+while+(!fit+&&+fontSize+>+minFontSize);
++++if+(fit)+{
++++++++self.textView.font+=+[self.textView.font+fontWithSize:fontSize];
++++++++NSLog(@"Fit!");
++++}+else+{
++++++++NSLog(@"No+fit");
++++}
++++return+fit;
}|code-block|syntax|javascript|427459|entityMap^0|I|K|18|A|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|Z|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|10|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

Ok so I spent lots of time debugging this. I found out that the maximum text height as defined by <code>boundingRectWithSize</code> allowed to display text by my <code>UITextView</code> was lower than the frame size.

In my case the frame is at most 140pt but the UITextView tolerate texts at most 131pt.

I had to figure that out manually and hardcode the "real" maximum height.

Here is my solution:

<pre><code>- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
 NSString *proposedText = [textView.text stringByReplacingCharactersInRange:range withString:text];
 NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:proposedText];
 CGRect boundingRect;
 CGFloat maxFontSize = 100;
 CGFloat minFontSize = 30;
 CGFloat fontSize = maxFontSize + 1;
 BOOL fit;
 NSLog(@"Trying text: \"%@\"", proposedText);
 do {
 fontSize -= 1;
 //XXX Seems like trailing whitespaces count for 0. find a workaround
 [attributedText addAttribute:NSFontAttributeName value:[textView.font fontWithSize:fontSize] range:NSMakeRange(0, attributedText.length)];
 CGFloat padding = textView.textContainer.lineFragmentPadding;
 CGSize boundingSize = CGSizeMake(textView.frame.size.width - padding * 2, CGFLOAT_MAX);
 boundingRect = [attributedText boundingRectWithSize:boundingSize options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading context:nil];
 NSLog(@"bounding rect for font %f is %@; (max is %f %f). Padding: %f", fontSize, NSStringFromCGRect(boundingRect), textView.frame.size.width, 148.0, padding);
 fit = boundingRect.size.height &lt;= 131;
 } while (!fit &amp;&amp; fontSize &gt; minFontSize);
 if (fit) {
 self.textView.font = [self.textView.font fontWithSize:fontSize];
 NSLog(@"Fit!");
 } else {
 NSLog(@"No fit");
 }
 return fit;
}
</code></pre>

blocks|key|209317|text|遇到完全相同的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|209318|对我来说，这个问题是由TTTAttributedLabel解决的|offset|length|209319|%2B+(CGSize)sizeThatFitsAttributedString:(NSAttributedString+*)attributedString
+++++++++++++++++++++++withConstraints:(CGSize)size
++++++++++++++++limitedToNumberOfLines:(NSUInteger)numberOfLines|code-block|syntax|javascript|209320|方法，因为它提供了准确的结果。|209321|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/TTTAttributedLabel/TTTAttributedLabel^0|0|B|I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Encountered exactly same issue.
To me, the issue is solved by <a href="https://github.com/TTTAttributedLabel/TTTAttributedLabel" rel="nofollow noreferrer">TTTAttributedLabel</a>'s
<pre><code>+ (CGSize)sizeThatFitsAttributedString:(NSAttributedString *)attributedString
 withConstraints:(CGSize)size
 limitedToNumberOfLines:(NSUInteger)numberOfLines
</code></pre>
method, as it provide accurate result.

blocks|key|427517|text|David+Rees很好地总结了options，这里的许多答案都很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|427518|但有时当有特殊字符或多个空格时，大小似乎总是错误的。|427519|无效字符串的示例(对我来说)：|427520|"hello++++.+++.++world"|code-block|syntax|javascript|427521|我发现将NSAttributedString的kern设置为1有助于返回正确的大小。|style|CODE|427522|如下所示：|427523|NSAttributedString(
++++string:+"some+string",
++++attributes:+[
++++++++.font:+NSFont.preferredFont(forTextStyle:+.body),+
++++++++.kern:+1])|427524|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/44896950/4691224|1|https://developer.apple.com/documentation/foundation/nsattributedstring/key/1527891-kern^0|G|7|0|0|0|0|0|4|I|U|1|N|4|1|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1B|8|@$A|1C|B|1D|O|P]|$A|1E|B|1F|O|P]]|9|@$A|1G|B|1H|1|1I]]|C|$]]|$1|Q|3|R|5|6|7|1J|8|@]|9|@]|C|$]]|$1|S|3|T|5|J|7|1K|8|@]|9|@]|C|$K|L]]|$1|U|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]]]

Many of the answers here are great, David Rees summarises the <a href="https://stackoverflow.com/a/44896950/4691224">options</a> nicely.
But sometimes when there are special characters or multiple white spaces the size seemed to always be wrong.
Example of a not working string (for me):
<pre><code>&quot;hello . . world&quot;
</code></pre>
What I found out is that setting the <a href="https://developer.apple.com/documentation/foundation/nsattributedstring/key/1527891-kern" rel="nofollow noreferrer">kern</a> of the <code>NSAttributedString</code> to <code>1</code> helps returning the right size.
Like this:
<pre><code>NSAttributedString(
 string: &quot;some string&quot;,
 attributes: [
 .font: NSFont.preferredFont(forTextStyle: .body), 
 .kern: 1])
</code></pre>

I am trying to get the rect for an attributed string, but the boundingRectWithSize call is not respecting the size I pass in and is returning a rect with a single line height as opposed to a large height (it is a long string). I have experimented by passing in a very large value for the height and also 0 as in the code below, but the rect returned is always the same.

<pre><code>CGRect paragraphRect = [attributedText boundingRectWithSize:CGSizeMake(300,0.0)
 options:NSStringDrawingUsesDeviceMetrics
 context:nil];
</code></pre>

Is this broken, or do I need to do something else to have it returned a rect for wrapped text?

boundingRectWithSize for NSAttributedString returning wrong size

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。

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我正在尝试获取一个属性字符串的rect，但是boundingRectWithSize调用没有考虑到我传入的大小，并且返回一个单行高度的rect，而不是一个很大的高度(它是一个很长的字符串)。我在下面的代码中尝试了传入一个非常大的高度值和0，但返回的rect总是相同的。CGRect paragraphRect = [at...

问NSAttributedString的boundingRectWithSize返回错误的大小
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问NSAttributedString的boundingRectWithSize返回错误的大小EN