blocks|key|210608|text|-+(CGFloat)heightStringWithEmojis:(NSString*)str+fontType:(UIFont+*)uiFont+ForWidth:(CGFloat)width+{

//+Get+text
CFMutableAttributedStringRef+attrString+=+CFAttributedStringCreateMutable(kCFAllocatorDefault,+0);
CFAttributedStringReplaceString+(attrString,+CFRangeMake(0,+0),+(CFStringRef)+str+);
CFIndex+stringLength+=+CFStringGetLength((CFStringRef)+attrString);

//+Change+font
CTFontRef+ctFont+=+CTFontCreateWithName((__bridge+CFStringRef)+uiFont.fontName,+uiFont.pointSize,+NULL);
CFAttributedStringSetAttribute(attrString,+CFRangeMake(0,+stringLength),+kCTFontAttributeName,+ctFont);

//+Calc+the+size
CTFramesetterRef+framesetter+=+CTFramesetterCreateWithAttributedString(attrString);
CFRange+fitRange;
CGSize+frameSize+=+CTFramesetterSuggestFrameSizeWithConstraints(framesetter,+CFRangeMake(0,+0),+NULL,+CGSizeMake(width,+CGFLOAT_MAX),+&fitRange);

CFRelease(ctFont);
CFRelease(framesetter);
CFRelease(attrString);

return+frameSize.height+%2B+10;

}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|210609|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>- (CGFloat)heightStringWithEmojis:(NSString*)str fontType:(UIFont *)uiFont ForWidth:(CGFloat)width {

// Get text
CFMutableAttributedStringRef attrString = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);
CFAttributedStringReplaceString (attrString, CFRangeMake(0, 0), (CFStringRef) str );
CFIndex stringLength = CFStringGetLength((CFStringRef) attrString);

// Change font
CTFontRef ctFont = CTFontCreateWithName((__bridge CFStringRef) uiFont.fontName, uiFont.pointSize, NULL);
CFAttributedStringSetAttribute(attrString, CFRangeMake(0, stringLength), kCTFontAttributeName, ctFont);

// Calc the size
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(attrString);
CFRange fitRange;
CGSize frameSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, 0), NULL, CGSizeMake(width, CGFLOAT_MAX), &amp;fitRange);

CFRelease(ctFont);
CFRelease(framesetter);
CFRelease(attrString);

return frameSize.height + 10;

}
</code></pre>

blocks|key|210704|text|感谢@SergiSolanellas！下面是一个采用attributedString的版本，缩短了方法，因为文本和字体已经设置好了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|210705|//
//+Given+an+attributed+string+that+may+have+emoji+characters+and+the+width+of+
//+the+display+area,+return+the+required+display+height.
//
-+(CGFloat)heightForAttributedStringWithEmojis:(NSAttributedString+*)attributedString+forWidth:(CGFloat)width+{
++++CTFramesetterRef+framesetter+=+CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attributedString);
++++CFRange+fitRange;
++++CGSize+frameSize+=+CTFramesetterSuggestFrameSizeWithConstraints(framesetter,+CFRangeMake(0,+0),+NULL,+CGSizeMake(width,+CGFLOAT_MAX),+&fitRange);

++++CFRelease(framesetter);

++++return+frameSize.height;
}|code-block|syntax|javascript|210706|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|$]]

Thank you @SergiSolanellas! Here's a version that takes an attributedString, shortening the method because the text and font are already set.

<pre><code>//
// Given an attributed string that may have emoji characters and the width of 
// the display area, return the required display height.
//
- (CGFloat)heightForAttributedStringWithEmojis:(NSAttributedString *)attributedString forWidth:(CGFloat)width {
 CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attributedString);
 CFRange fitRange;
 CGSize frameSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, 0), NULL, CGSizeMake(width, CGFLOAT_MAX), &amp;fitRange);

 CFRelease(framesetter);

 return frameSize.height;
}
</code></pre>

blocks|key|210792|text|我正在使用UILabel|type|unstyled|depth|inlineStyleRanges|entityRanges|data|210793|大小(_sizeThatFits:+CGSize)+->+CGSize|210794|这对我很管用。|210795|我的代码|210796|let+tempLabel+=+UILabel()
tempLabel.font+=+font
tempLabel.attributedText+=+attText
tempLabel.numberOfLines+=+0
let+size+=+tempLabel.sizeThatFits(CGSize(width:+200,+height:CGFloat.greatestFiniteMagnitude))|code-block|syntax|javascript|210797|作为代码，您需要分配三个属性。|210798|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I am use UILabel 

sizeThatFits(_ size: CGSize) -> CGSize

It work for me.

my code

<pre><code>let tempLabel = UILabel()
tempLabel.font = font
tempLabel.attributedText = attText
tempLabel.numberOfLines = 0
let size = tempLabel.sizeThatFits(CGSize(width: 200, height:CGFloat.greatestFiniteMagnitude))
</code></pre>

as the code, you need to assign three property.

In a <code>UITableView</code> that needs to display a long list of chatlike conversations, often containing emojis, a size calculation error occurs.

My problem is, that if a string is just the right length, and I use <code>sizeWithFont</code>, I on my first measurement using <code>sizewithfont</code> get an incorrect length of the string, causing a "linebreak".

I assume that it is because the string ":-)" is broader than the actual smiley icon.

The evidence can be seen here :

<img src="https://i.stack.imgur.com/sggw2.png" alt="Using &lt;code&gt;SizeWithFont&lt;/code&gt;">

Now, over at some other stacks, some claim that <code>sizeWithFont</code> will only account for the string, not the Emoji, which for me doesn't make sense, since it gets it right "eventually"...

But they propose using sizeToFit instead, so I decided to give it a go.

<img src="https://i.stack.imgur.com/sOnCj.png" alt="Using SizeToFit">

Bam, same result.

Does anyone know how to counter this ? Is there a <code>boolean</code> to check if "Label is done being emoji-processed" so i can skip that call ?

Running the same line twice does nothing, it seems the view needs to be drawn, before <code>sizeWithFont</code> realises its mistake.

The shown column is run in a <code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath</code> segment, on a custom cell. I can replicate the error on a perfectly regular UITableViewCell as well, so that doesn't seem to be it.

Emojis messing with obj-c's sizeWithFont math

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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在需要显示一长串类似聊天的对话(通常包含表情符号)的UITableView中，会出现大小计算错误。我的问题是，如果一个字符串的长度恰到好处，并且我使用了sizeWithFont，那么在我第一次使用sizewithfont进行测量时，我得到的字符串长度是不正确的，这会导致“换行”。我假设这是因为字符串":-)“比实际的笑...

问表情符号扰乱了obj-c的sizeWithFont数学
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