blocks|key|4574492|text|您可以通过NSString+UIKit+Additions中的各种sizeWithFont:方法来实现这一点。在您的示例中，最简单的变体应该足够了(因为您没有多行标签)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4574493|NSString+*someString+=+@"Hello+World";
UIFont+*yourFont+=+//+[UIFont+...]
CGSize+stringBoundingBox+=+[someString+sizeWithFont:yourFont];|code-block|syntax|javascript|4574494|这种方法有几种变体，例如。有些人考虑换行模式或最大大小。|4574495|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html^0|X|D|5|O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

You can do exactly that via the various <code>sizeWithFont:</code> methods in <a href="http://developer.apple.com/library/ios/documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html" rel="noreferrer">NSString UIKit Additions</a>. In your case the simplest variant should suffice (since you don't have multi-line labels):

<pre><code>NSString *someString = @"Hello World";
UIFont *yourFont = // [UIFont ...]
CGSize stringBoundingBox = [someString sizeWithFont:yourFont];
</code></pre>

There are several variations of this method, eg. some consider line break modes or maximum sizes.

blocks|key|4574445|text|由于sizeWithFont已被弃用，我将更新我的原始答案，以使用Swift+4和.size|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4574446|//:+Playground+-+noun:+a+place+where+people+can+play

import+UIKit

if+let+font+=+UIFont(name:+"Helvetica",+size:+24)+{
+++let+fontAttributes+=+[NSAttributedStringKey.font:+font]
+++let+myText+=+"Your+Text+Here"
+++let+size+=+(myText+as+NSString).size(withAttributes:+fontAttributes)
}|code-block|syntax|javascript|4574447|大小应为屏幕上“您的文本”的大小(以磅为单位)。|4574448|entityMap^0|2|C|15|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Since <code>sizeWithFont</code> is deprecated, I'm just going to update my original answer to using Swift 4 and <code>.size</code>

<pre><code>//: Playground - noun: a place where people can play

import UIKit

if let font = UIFont(name: "Helvetica", size: 24) {
 let fontAttributes = [NSAttributedStringKey.font: font]
 let myText = "Your Text Here"
 let size = (myText as NSString).size(withAttributes: fontAttributes)
}
</code></pre>

The size should be the onscreen size of "Your Text Here" in points.

blocks|key|1357894|text|sizeWithFont:现在已弃用，请改用sizeWithAttributes:：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1357895|UIFont+*font+=+[UIFont+fontWithName:@"Helvetica"+size:30];
NSDictionary+*userAttributes+=+@{NSFontAttributeName:+font,
+++++++++++++++++++++++++++++++++NSForegroundColorAttributeName:+[UIColor+blackColor]};
NSString+*text+=+@"hello";
...
const+CGSize+textSize+=+[text+sizeWithAttributes:+userAttributes];|code-block|syntax|javascript|1357896|entityMap^0|0|D|M|J|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

<code>sizeWithFont:</code> is now deprecated, use <code>sizeWithAttributes:</code> instead:

<pre><code>UIFont *font = [UIFont fontWithName:@"Helvetica" size:30];
NSDictionary *userAttributes = @{NSFontAttributeName: font,
 NSForegroundColorAttributeName: [UIColor blackColor]};
NSString *text = @"hello";
...
const CGSize textSize = [text sizeWithAttributes: userAttributes];
</code></pre>

blocks|key|242311|text|更新2019年9月|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242312|使用新的语法，This+answer是一种更简洁的方法。|offset|length|242313|原始答案|242314|基于Glenn+Howes'+excellent+answer，我创建了一个扩展来计算字符串的宽度。如果要设置UISegmentedControl的宽度，可以根据片段的标题字符串设置宽度。|style|CODE|242315|extension+String+{

++++func+widthOfString(usingFont+font:+UIFont)+->+CGFloat+{
++++++++let+fontAttributes+=+[NSAttributedString.Key.font:+font]
++++++++let+size+=+self.size(withAttributes:+fontAttributes)
++++++++return+size.width
++++}

++++func+heightOfString(usingFont+font:+UIFont)+->+CGFloat+{
++++++++let+fontAttributes+=+[NSAttributedString.Key.font:+font]
++++++++let+size+=+self.size(withAttributes:+fontAttributes)
++++++++return+size.height
++++}

++++func+sizeOfString(usingFont+font:+UIFont)+->+CGSize+{
++++++++let+fontAttributes+=+[NSAttributedString.Key.font:+font]
++++++++return+self.size(withAttributes:+fontAttributes)
++++}
}|code-block|syntax|javascript|242316|用法：|242317|++++//+Set+width+of+segmentedControl
++++let+starString+=+"⭐️"
++++let+starWidth+=+starString.widthOfString(usingFont:+UIFont.systemFont(ofSize:+14))+%2B+16
++++segmentedController.setWidth(starWidth,+forSegmentAt:+3)|242318|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/52378302/4475605|1|https://stackoverflow.com/a/1324429/4475605^0|0|7|B|0|0|0|1J|I|2|T|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@$D|1B|E|1C|J|K]]|9|@$D|1D|E|1E|1|1F]]|A|$]]|$1|L|3|M|5|N|7|1G|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|1I|8|@]|9|@]|A|$O|P]]|$1|U|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]]]

<h1>Update Sept 2019</h1>

<a href="https://stackoverflow.com/a/52378302/4475605">This answer</a> is a much cleaner way to do it using new syntax.

<h1>Original Answer</h1>

Based on <a href="https://stackoverflow.com/a/1324429/4475605">Glenn Howes' excellent answer</a>, I created an extension to calculate the width of a string. If you're doing something like setting the width of a <code>UISegmentedControl</code>, this can set the width based on the segment's title string.

<pre><code>extension String {

 func widthOfString(usingFont font: UIFont) -&gt; CGFloat {
 let fontAttributes = [NSAttributedString.Key.font: font]
 let size = self.size(withAttributes: fontAttributes)
 return size.width
 }

 func heightOfString(usingFont font: UIFont) -&gt; CGFloat {
 let fontAttributes = [NSAttributedString.Key.font: font]
 let size = self.size(withAttributes: fontAttributes)
 return size.height
 }

 func sizeOfString(usingFont font: UIFont) -&gt; CGSize {
 let fontAttributes = [NSAttributedString.Key.font: font]
 return self.size(withAttributes: fontAttributes)
 }
}
</code></pre>

usage:

<pre><code> // Set width of segmentedControl
 let starString = "⭐️"
 let starWidth = starString.widthOfString(usingFont: UIFont.systemFont(ofSize: 14)) + 16
 segmentedController.setWidth(starWidth, forSegmentAt: 3)
</code></pre>

blocks|key|1544266|text|Swift-5|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1544267|使用intrinsicContentSize查找文本的高度和宽度。|1544268|yourLabel.intrinsicContentSize.width|CODE|1544269|即使字符串之间有像"T+E+X+T"这样的自定义间距，这也是可行的|1544270|entityMap^0|0|7|0|0|0|10|0|9|9|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|S|8|@$9|T|A|U|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|N|$]]

<h1>Swift-5</h1>

Use intrinsicContentSize to find the text height and width. 

<code>yourLabel.intrinsicContentSize.width</code>

This will work even you have custom spacing between your string like "T E X T"

blocks|key|1358010|text|Swift+4.2中的Oneliner|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1358011|let+size+=+"abc".size(withAttributes:[.font:+UIFont.systemFont(ofSize:+18.0)])|code-block|syntax|javascript|1358012|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|$]]

<h3>Oneliner in Swift 4.2 </h3>
<pre><code>let size = &quot;abc&quot;.size(withAttributes:[.font: UIFont.systemFont(ofSize: 18.0)])
</code></pre>

blocks|key|1357971|text|Swift中的这个简单扩展工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1357972|extension+String+{
++++func+size(OfFont+font:+UIFont)+->+CGSize+{
++++++++return+(self+as+NSString).size(attributes:+[NSFontAttributeName:+font])
++++}
}|code-block|syntax|javascript|1357973|用法：|1357974|let+string+=+"hello+world!"
let+font+=+UIFont.systemFont(ofSize:+12)
let+width+=+string.size(OfFont:+font).width+//+size:+{w:+98.912+h:+14.32}|1357975|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This simple extension in Swift works well.

<pre><code>extension String {
 func size(OfFont font: UIFont) -&gt; CGSize {
 return (self as NSString).size(attributes: [NSFontAttributeName: font])
 }
}
</code></pre>

Usage:

<pre><code>let string = "hello world!"
let font = UIFont.systemFont(ofSize: 12)
let width = string.size(OfFont: font).width // size: {w: 98.912 h: 14.32}
</code></pre>

blocks|key|4574775|text|如果你很难通过multiline+support获得text+width，那么你可以使用下面的代码(Swift+5)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4574776|func+width(text:+String,+height:+CGFloat)+->+CGFloat+{
++++let+attributes:+[NSAttributedString.Key:+Any]+=+[
++++++++.font:+UIFont.systemFont(ofSize:+17)
++++]
++++let+attributedText+=+NSAttributedString(string:+text,+attributes:+attributes)
++++let+constraintBox+=+CGSize(width:+.greatestFiniteMagnitude,+height:+height)
++++let+textWidth+=+attributedText.boundingRect(with:+constraintBox,+options:+[.usesLineFragmentOrigin,+.usesFontLeading],+context:+nil).width.rounded(.up)

++++return+textWidth
}|code-block|syntax|javascript|4574777|如果需要，也可以用同样的方法来查找文本高度(只需切换constraintBox实现)：|4574778|let+constraintBox+=+CGSize(width:+maxWidth,+height:+.greatestFiniteMagnitude)|4574779|下面是一个支持多行的统一函数，用于获取文本大小：|4574780|func+labelSize(for+text:+String,+maxWidth:+CGFloat,+maxHeight:+CGFloat)+->+CGSize+{
++++let+attributes:+[NSAttributedString.Key:+Any]+=+[
++++++++.font:+UIFont.systemFont(ofSize:+17)
++++]

++++let+attributedText+=+NSAttributedString(string:+text,+attributes:+attributes)

++++let+constraintBox+=+CGSize(width:+maxWidth,+height:+maxHeight)
++++let+rect+=+attributedText.boundingRect(with:+constraintBox,+options:+[.usesLineFragmentOrigin,+.usesFontLeading],+context:+nil).integral

++++return+rect.size
}|4574781|用法：|4574782|let+textSize+=+labelSize(for:+"SomeText",+maxWidth:+contentView.bounds.width,+maxHeight:+.greatestFiniteMagnitude)
let+textHeight+=+textSize.height.rounded(.up)
let+textWidth+=+textSize.width.rounded(.up)|4574783|entityMap^0|7|H|V|5|1E|7|0|0|0|0|A|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1C|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|W|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|X|$]]

If you're struggling to get text width with multiline support, so you can use the next code (Swift 5):

<pre><code>func width(text: String, height: CGFloat) -&gt; CGFloat {
 let attributes: [NSAttributedString.Key: Any] = [
 .font: UIFont.systemFont(ofSize: 17)
 ]
 let attributedText = NSAttributedString(string: text, attributes: attributes)
 let constraintBox = CGSize(width: .greatestFiniteMagnitude, height: height)
 let textWidth = attributedText.boundingRect(with: constraintBox, options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil).width.rounded(.up)

 return textWidth
}
</code></pre>

And the same way you could find text height if you need to (just switch the constraintBox implementation):

<pre><code>let constraintBox = CGSize(width: maxWidth, height: .greatestFiniteMagnitude)
</code></pre>

Or here's a unified function to get text size with multiline support:

<pre><code>func labelSize(for text: String, maxWidth: CGFloat, maxHeight: CGFloat) -&gt; CGSize {
 let attributes: [NSAttributedString.Key: Any] = [
 .font: UIFont.systemFont(ofSize: 17)
 ]

 let attributedText = NSAttributedString(string: text, attributes: attributes)

 let constraintBox = CGSize(width: maxWidth, height: maxHeight)
 let rect = attributedText.boundingRect(with: constraintBox, options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil).integral

 return rect.size
}
</code></pre>

Usage:

<pre><code>let textSize = labelSize(for: "SomeText", maxWidth: contentView.bounds.width, maxHeight: .greatestFiniteMagnitude)
let textHeight = textSize.height.rounded(.up)
let textWidth = textSize.width.rounded(.up)
</code></pre>

blocks|key|242342|text|对于Swift+5.4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|242343|extension+String+{
++++func+SizeOf_String(+font:+UIFont)+->+CGSize+{
++++++++let+fontAttribute+=+[NSAttributedString.Key.font:+font]
++++++++let+size+=+self.size(withAttributes:+fontAttribute)++//+for+Single+Line
+++++++return+size;
++++}
}|code-block|syntax|javascript|242344|像这样使用它。|242345|++++++++let+Str+=+"ABCDEF"
++++++++let+Font+=++UIFont.systemFontOfSize(19.0)
++++++++let+SizeOfString+=+Str.SizeOfString(font:+Font!)|242346|entityMap^0|2|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

For Swift 5.4
<pre><code>extension String {
 func SizeOf_String( font: UIFont) -&gt; CGSize {
 let fontAttribute = [NSAttributedString.Key.font: font]
 let size = self.size(withAttributes: fontAttribute) // for Single Line
 return size;
 }
}
</code></pre>
Use it like...
<pre><code> let Str = &quot;ABCDEF&quot;
 let Font = UIFont.systemFontOfSize(19.0)
 let SizeOfString = Str.SizeOfString(font: Font!)
</code></pre>

blocks|key|1358034|text|Swift+4|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1358035|extension+String+{
++++func+SizeOf(_+font:+UIFont)+->+CGSize+{
++++++++return+self.size(withAttributes:+[NSAttributedStringKey.font:+font])
++++}
}|code-block|syntax|javascript|1358036|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|$]]

Swift 4

<pre><code>extension String {
 func SizeOf(_ font: UIFont) -&gt; CGSize {
 return self.size(withAttributes: [NSAttributedStringKey.font: font])
 }
}
</code></pre>

blocks|key|1544180|text|这是针对swift+2.3版本的。你可以得到字符串的宽度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1544181|var+sizeOfString+=+CGSize()
if+let+font+=+UIFont(name:+"Helvetica",+size:+14.0)
++++{
++++++++let+finalDate+=+"Your+Text+Here"
++++++++let+fontAttributes+=+[NSFontAttributeName:+font]+//+it+says+name,+but+a+UIFont+works
++++++++sizeOfString+=+(finalDate+as+NSString).sizeWithAttributes(fontAttributes)
++++}|code-block|syntax|javascript|1544182|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|$]]

This is for swift 2.3 Version. You can get the width of string.

<pre><code>var sizeOfString = CGSize()
if let font = UIFont(name: "Helvetica", size: 14.0)
 {
 let finalDate = "Your Text Here"
 let fontAttributes = [NSFontAttributeName: font] // it says name, but a UIFont works
 sizeOfString = (finalDate as NSString).sizeWithAttributes(fontAttributes)
 }
</code></pre>

blocks|key|242763|text|我不确定这有多有效，但我写了这个函数，它返回适合给定宽度的字符串的磅大小：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242764|func+fontSizeThatFits(targetWidth:+CGFloat,+maxFontSize:+CGFloat,+font:+UIFont)+->+CGFloat+{
++++var+variableFont+=+font.withSize(maxFontSize)
++++var+currentWidth+=+self.size(withAttributes:+[NSAttributedString.Key.font:variableFont]).width

++++while+currentWidth+>+targetWidth+{
++++++++variableFont+=+variableFont.withSize(variableFont.pointSize+-+1)
++++++++currentWidth+=+self.size(withAttributes:+[NSAttributedString.Key.font:variableFont]).width
++++}

++++return+variableFont.pointSize
}|code-block|syntax|javascript|242765|它的用法如下：|242766|textView.font+=+textView.font!.withSize(textView.text!.fontSizeThatFits(targetWidth:+view.frame.width,+maxFontSize:+50,+font:+textView.font!))|offset|length|style|CODE|242767|entityMap^0|0|0|0|0|3Y|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Not sure how efficient this is, but I wrote this function that returns the point size that will fit a string to a given width:

<pre class="lang-swift prettyprint-override"><code>func fontSizeThatFits(targetWidth: CGFloat, maxFontSize: CGFloat, font: UIFont) -&gt; CGFloat {
 var variableFont = font.withSize(maxFontSize)
 var currentWidth = self.size(withAttributes: [NSAttributedString.Key.font:variableFont]).width

 while currentWidth &gt; targetWidth {
 variableFont = variableFont.withSize(variableFont.pointSize - 1)
 currentWidth = self.size(withAttributes: [NSAttributedString.Key.font:variableFont]).width
 }

 return variableFont.pointSize
}
</code></pre>

And it would be used like this:

<code>textView.font = textView.font!.withSize(textView.text!.fontSizeThatFits(targetWidth: view.frame.width, maxFontSize: 50, font: textView.font!))</code>

blocks|key|4574729|text|我的代码是扩展UIFont：(这是Swift+4.1)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4574730|extension+UIFont+{


++++public+func+textWidth(s:+String)+->+CGFloat
++++{
++++++++return+s.size(withAttributes:+[NSAttributedString.Key.font:+self]).width
++++}

}+//+extension+UIFont|code-block|syntax|javascript|4574731|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|$]]

The way I am doing it my code is to make an extension of UIFont: (This is Swift 4.1)

<pre><code>extension UIFont {


 public func textWidth(s: String) -&gt; CGFloat
 {
 return s.size(withAttributes: [NSAttributedString.Key.font: self]).width
 }

} // extension UIFont
</code></pre>

blocks|key|1358221|text|带有Swift5的SwiftUI|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1358222|在SwiftUI中，您找不到一种简单的方法将UIFont转换为字体。因此，之前的答案可能不起作用。您可以在overlay()修饰符中使用GeometryReader{+geometryProxy+in+}来获取文本大小。请注意，如果不在overlay()中使用它，视图将扩展到尽可能多的内容。|1358223|如果您想要将变量传递出去，可能需要编写一个View扩展函数来执行此操作。|1358224|Text("Lat.:+\(latitude),+Lon.:+\(longitude)+")
++++.font(Font.custom("ChalkboardSE-Light",size:+20))
++++.overlay(
++++GeometryReader{+geometryProxy+in
++++++++Image("button_img")
+++++++++++++.resizable()
+++++++++++++.frame(width:+10+,+height:+10)
+++++++++++++.offset(x:+geometryProxy.size.width)
+++++++++++++.extensionFunction{+//...+}
++++++++++++++})|code-block|syntax|javascript|1358225|几天前，我从另一个线程复制了扩展函数。|1358226|extension+View{
++++func+extensionFunction(_+closure:()+->+Void)+->+Self{
++++++++closure()
++++++++return+self
++++}
++++
}|1358227|entityMap^0|9|7|0|0|1H|1W|Y|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|T|$]]

SwiftUI with Swift5
In SwiftUI, you could not find an easy way to convert UIFont to Font. So the previous answers may not work.
You could use GeometryReader{ geometryProxy in } inside the overlay() modifier to get the Text size. Be careful that if you don't use it inside overlay(), the View will expand to as much as it can.
If you want to pass the variable out, you may need to write a View extension function to do so.
<pre><code>Text(&quot;Lat.: \(latitude), Lon.: \(longitude) &quot;)
 .font(Font.custom(&quot;ChalkboardSE-Light&quot;,size: 20))
 .overlay(
 GeometryReader{ geometryProxy in
 Image(&quot;button_img&quot;)
 .resizable()
 .frame(width: 10 , height: 10)
 .offset(x: geometryProxy.size.width)
 .extensionFunction{ //... }
 })
 
</code></pre>
I copied the extension function from another thread a couple days ago.
<pre><code>extension View{
 func extensionFunction(_ closure:() -&gt; Void) -&gt; Self{
 closure()
 return self
 }
 
}
</code></pre>

I have a UILabel that displays some chars. Like "x", "y" or "rpm". How can I calculate the width of the text in the label (it does not ues the whole available space)? This is for automatic layouting, where another view will have a bigger frame rectangle if that UILabel has a smaller text inside. Are there methods to calculate that width of the text when a UIFont and font size is specified? There's also no line-break and just one single line.

How to calculate the width of a text string of a specific font and font-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。

页面排版不美观，阅读体验差。

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我有一个可以显示一些字符的UILabel。例如"x“、"y”或"rpm“。如何计算标签中文本的宽度(它不会占用整个可用空间)？这是为了自动布局，如果另一个UILabel里面有较小的文本，那么另一个视图将有一个更大的框架矩形。当指定了UIFont和字体大小时，是否有计算文本宽度的方法？也没有换行，只有一行。

问如何计算特定字体和字体大小的文本字符串的宽度？
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回答 14

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问如何计算特定字体和字体大小的文本字符串的宽度？EN

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问如何计算特定字体和字体大小的文本字符串的宽度？
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