blocks|key|28561|text|将换行模式设置为自动换行，将行数设置为0|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|28562|//+Swift
textLabel.lineBreakMode+=+.byWordWrapping
textLabel.numberOfLines+=+0

//+Objective-C
textLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
textLabel.numberOfLines+=+0;

//+C#+(Xamarin.iOS)
textLabel.LineBreakMode+=+UILineBreakMode.WordWrap;
textLabel.Lines+=+0;++|code-block|syntax|javascript|28563|恢复了旧答案(供参考和愿意支持iOS+6.0以下版本的开发人员使用)：|28564|textLabel.lineBreakMode+=+UILineBreakModeWordWrap;
textLabel.numberOfLines+=+0;|28565|另外:两个枚举值都屈从于0。|28566|entityMap^0|J|1|0|0|0|0|C|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

Set the line break mode to word-wrapping and the number of lines to <code>0</code>:
<pre><code>// Swift
textLabel.lineBreakMode = .byWordWrapping
textLabel.numberOfLines = 0

// Objective-C
textLabel.lineBreakMode = NSLineBreakByWordWrapping;
textLabel.numberOfLines = 0;

// C# (Xamarin.iOS)
textLabel.LineBreakMode = UILineBreakMode.WordWrap;
textLabel.Lines = 0; 
</code></pre>
Restored old answer (for reference and devs willing to support iOS below 6.0):
<pre><code>textLabel.lineBreakMode = UILineBreakModeWordWrap;
textLabel.numberOfLines = 0;
</code></pre>
On the side: both enum values yield to <code>0</code> anyway.

blocks|key|4148708|text|在IB中，将行数设置为0(允许不限制行数)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4148709|使用IB在文本字段中键入时，使用"alt-+return“插入一个回车符并转到下一行(或者您也可以复制已由行分隔的文本)。|4148710|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|$]]

In IB, set number of lines to 0 (allows unlimited lines)

When typing within the text field using IB, use "alt-return" to insert a return and go to the next line (or you can copy in text already separated out by lines).

blocks|key|932087|text|我找到的最好的解决方案(对于一个本应在框架中解决的令人沮丧的问题)类似于vaychick的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|932088|只需在IB或code中将行数设置为0|932089|myLabel.numberOfLines+=+0;|code-block|syntax|javascript|932090|这将显示所需的线，但会重新定位标签，使其水平居中(以便1线和3线标签在其水平位置对齐)。要修复该添加，请执行以下操作：|932091|CGRect+currentFrame+=+myLabel.frame;
CGSize+max+=+CGSizeMake(myLabel.frame.size.width,+500);
CGSize+expected+=+[myString+sizeWithFont:myLabel.font+constrainedToSize:max+lineBreakMode:myLabel.lineBreakMode];+
currentFrame.size.height+=+expected.height;
myLabel.frame+=+currentFrame;|932092|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

The best solution I have found (to an otherwise frustrating problem that should have been solved in the framework) is similar to vaychick's.

Just set number of lines to 0 in either IB or code

<pre><code>myLabel.numberOfLines = 0;
</code></pre>

This will display the lines needed but will reposition the label so its centered horizontally (so that a 1 line and 3 line label are aligned in their horizontal position). To fix that add:

<pre><code>CGRect currentFrame = myLabel.frame;
CGSize max = CGSizeMake(myLabel.frame.size.width, 500);
CGSize expected = [myString sizeWithFont:myLabel.font constrainedToSize:max lineBreakMode:myLabel.lineBreakMode]; 
currentFrame.size.height = expected.height;
myLabel.frame = currentFrame;
</code></pre>

blocks|key|1329124|text|使用此选项可在UILabel中使用多行文本|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1329125|textLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
textLabel.numberOfLines+=+0;|code-block|syntax|javascript|1329126|Swift：|1329127|textLabel.lineBreakMode+=+.byWordWrapping
textLabel.numberOfLines+=+0|1329128|entityMap^0|7|7|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|$]]

Use this to have multiple lines of text in <code>UILabel</code>:

<pre><code>textLabel.lineBreakMode = NSLineBreakByWordWrapping;
textLabel.numberOfLines = 0;
</code></pre>

Swift:

<pre><code>textLabel.lineBreakMode = .byWordWrapping
textLabel.numberOfLines = 0
</code></pre>

blocks|key|932163|text|myUILabel.numberOfLines+=+0;
myUILabel.text+=+@"your+long+string+here";
[myUILabel+sizeToFit];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|932164|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>myUILabel.numberOfLines = 0;
myUILabel.text = @"your long string here";
[myUILabel sizeToFit];
</code></pre>

blocks|key|4148799|text|如果您必须使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4148800|myLabel.numberOfLines+=+0;|code-block|syntax|javascript|4148801|属性，也可以在代码中使用标准的换行符("\n")强制换行。|offset|length|style|CODE|4148802|entityMap^0|0|0|I|6|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you have to use the: 

<pre><code>myLabel.numberOfLines = 0;
</code></pre>

property you can also use a standard line break <code>("\n")</code>, in code, to force a new line.

blocks|key|29512|text|在使用NSString填充UILabel时，您可以使用\r转到下一行。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|29513|UILabel+*+label;


label.text+=+[NSString+stringWithFormat:@"%25@+\r+%25@",@"first+line",@"seconcd+line"];|code-block|syntax|javascript|29514|entityMap^0|3|8|D|7|R|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$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]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

You can use <code>\r</code> to go to next line while filling up the <code>UILabel</code> using <code>NSString</code>.

<pre><code>UILabel * label;


label.text = [NSString stringWithFormat:@"%@ \r %@",@"first line",@"seconcd line"];
</code></pre>

blocks|key|1329133|text|让我们试试这个|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1329134|textLabel.lineBreakMode+=+NSLineBreakModeWordWrap;+//+UILineBreakModeWordWrap+deprecated+++++
textLabel.numberOfLines+=+0;++++++++++++++++++++++++++|code-block|syntax|javascript|1329135|entityMap^0|0|7|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|$]]

lets try this

<pre><code>textLabel.lineBreakMode = NSLineBreakModeWordWrap; // UILineBreakModeWordWrap deprecated 
textLabel.numberOfLines = 0; 
</code></pre>

blocks|key|932050|text|textLabel.lineBreakMode+=+UILineBreakModeWordWrap;
textLabel.numberOfLines+=+0;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|932051|上面的解决方案在我的情况下不起作用。我是这样做的：|unstyled|932052|-+(CGFloat)tableView:(UITableView+*)tableView+heightForRowAtIndexPath:(NSIndexPath+*)indexPath
{
++++//+...

++++CGSize+size+=+[str+sizeWithFont:[UIFont+fontWithName:@"Georgia-Bold"+size:18.0]+constrainedToSize:CGSizeMake(240.0,+480.0)+lineBreakMode:UILineBreakModeWordWrap];
++++return+size.height+%2B+20;
}

-+(UITableViewCell+*)tableView:(UITableView+*)tableView+cellForRowAtIndexPath:(NSIndexPath+*)indexPath
{
++++UITableViewCell+*cell+=+[tableView+dequeueReusableCellWithIdentifier:CellIdentifier];

++++if+(cell+==+nil)
++++{
++++++++//+...
++++++++cell.textLabel.lineBreakMode+=+UILineBreakModeWordWrap;
++++++++cell.textLabel.numberOfLines+=+0;
++++++++cell.textLabel.font+=+[UIFont+fontWithName:@"Georgia-Bold"+size:18.0];
++++}

++++//+...

++++UILabel+*textLabel+=+[cell+textLabel];
++++CGSize+size+=+[text+sizeWithFont:[UIFont+fontWithName:@"Georgia-Bold"+size:18.0]
++++++++++++++++++++++++++++++++++++++++constrainedToSize:CGSizeMake(240.0,+480.0)
++++++++++++++++++++++++++++++++++++++++++++lineBreakMode:UILineBreakModeWordWrap];

++++cell.textLabel.frame+=+CGRectMake(0,+0,+size.width+%2B+20,+size.height+%2B+20);

++++//...
}|932053|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>textLabel.lineBreakMode = UILineBreakModeWordWrap;
textLabel.numberOfLines = 0;
</code></pre>

The solution above does't work in my case. I'm doing like this:

<pre><code>- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
 // ...

 CGSize size = [str sizeWithFont:[UIFont fontWithName:@"Georgia-Bold" size:18.0] constrainedToSize:CGSizeMake(240.0, 480.0) lineBreakMode:UILineBreakModeWordWrap];
 return size.height + 20;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

 if (cell == nil)
 {
 // ...
 cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
 cell.textLabel.numberOfLines = 0;
 cell.textLabel.font = [UIFont fontWithName:@"Georgia-Bold" size:18.0];
 }

 // ...

 UILabel *textLabel = [cell textLabel];
 CGSize size = [text sizeWithFont:[UIFont fontWithName:@"Georgia-Bold" size:18.0]
 constrainedToSize:CGSizeMake(240.0, 480.0)
 lineBreakMode:UILineBreakModeWordWrap];

 cell.textLabel.frame = CGRectMake(0, 0, size.width + 20, size.height + 20);

 //...
}
</code></pre>

blocks|key|4149234|text|Swift+3|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4149235|将动态文本信息的行数设置为零，这对于变化的文本将很有用。|4149236|var+label+=+UILabel()
let+stringValue+=+"A+label\nwith\nmultiline+text."
label.text+=+stringValue
label.numberOfLines+=+0
label.lineBreakMode+=+.byTruncatingTail+//+or+.byWrappingWord
label.minimumScaleFactor+=+0.8+.+//+It+is+not+required+but+nice+to+have+a+minimum+scale+factor+to+fit+text+into+label+frame|code-block|syntax|javascript|4149237|​|4149238|📷|atomic|4149239|4149240|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/6a58715138f069fa21127d548aae1090.png|imageAlt^0|0|7|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|16|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|R|3|N|5|6|7|1B|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]]]

Swift 3
 Set number of lines zero for dynamic text information, it will be useful for varying text.

<pre><code>var label = UILabel()
let stringValue = "A label\nwith\nmultiline text."
label.text = stringValue
label.numberOfLines = 0
label.lineBreakMode = .byTruncatingTail // or .byWrappingWord
label.minimumScaleFactor = 0.8 . // It is not required but nice to have a minimum scale factor to fit text into label frame
</code></pre>

<img src="https://i.stack.imgur.com/ej8F9.png" alt="enter image description here">

blocks|key|4149146|text|使用故事边框:选择标签将行数设置为零……Or+Refer+this|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4149147|​|4149148|📷|atomic|4149149|4149150|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/446405/adjust-uilabel-height-depending-on-the-text?rq=1|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/4a1e2af33c682c66db5592384bf6c96f.png|imageAlt^0|K|D|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|I|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|S|N|T|C|$U|V|W|-4]]]]

Use story borad : select the label to set number of lines to zero......<a href="https://stackoverflow.com/questions/446405/adjust-uilabel-height-depending-on-the-text?rq=1">Or Refer this</a> 

<a href="https://i.stack.imgur.com/CYBQL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CYBQL.png" alt="enter image description here"></a>

blocks|key|932266|text|尝试使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|932267|lblName.numberOfLines+=+0;
[lblName+sizeToFit];|code-block|syntax|javascript|932268|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|$]]

Try using this:

<pre><code>lblName.numberOfLines = 0;
[lblName sizeToFit];
</code></pre>

blocks|key|1331453|text|UILabel+*helpLabel+=+[[UILabel+alloc]+init];
NSAttributedString+*attrString+=+[[NSAttributedString+alloc]+initWithString:label];
helpLabel.attributedText+=+attrString;
//+helpLabel.text+=+label;

helpLabel.textAlignment+=+NSTextAlignmentCenter;
helpLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
helpLabel.numberOfLines+=+0;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1331454|由于某些原因，它在iOS+6中不能工作，不知道为什么。尝试使用属性文本和不使用属性文本。有什么建议吗。|unstyled|1331455|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>UILabel *helpLabel = [[UILabel alloc] init];
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:label];
helpLabel.attributedText = attrString;
// helpLabel.text = label;

helpLabel.textAlignment = NSTextAlignmentCenter;
helpLabel.lineBreakMode = NSLineBreakByWordWrapping;
helpLabel.numberOfLines = 0;
</code></pre>

For some reasons its not working for me in iOS 6 not sure why. Tried it with and without attributed text. Any suggestions.

blocks|key|1331692|text|方法1:|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1331693|extension+UILabel+{//Write+this+extension+after+close+brackets+of+your+class
++++func+lblFunction()+{
++++++++numberOfLines+=+0
++++++++lineBreakMode+=+.byWordWrapping//If+you+want+word+wraping
++++++++//OR
++++++++lineBreakMode+=+.byCharWrapping//If+you+want+character+wraping
++++}
}|code-block|syntax|javascript|1331694|现在像这样简单地调用|1331695|myLbl.lblFunction()//Replace+your+label+name+|1331696|例如：|1331697|Import+UIKit

class+MyClassName:+UIViewController+{//For+example+this+is+your+class.+

++++override+func+viewDidLoad()+{
++++super.viewDidLoad()

++++++++myLbl.lblFunction()//Replace+your+label+name+

++++}

}//After+close+of+your+class+write+this+extension.

extension+UILabel+{//Write+this+extension+after+close+brackets+of+your+class
++++func+lblFunction()+{
++++++++numberOfLines+=+0
++++++++lineBreakMode+=+.byWordWrapping//If+you+want+word+wraping
++++++++//OR
++++++++lineBreakMode+=+.byCharWrapping//If+you+want+character+wraping
++++}
}|1331698|方法2:|1331699|以编程方式|1331700|yourLabel.numberOfLines+=+0
yourLabel.lineBreakMode+=+.byWordWrapping//If+you+want+word+wraping
//OR
yourLabel.lineBreakMode+=+.byCharWrapping//If+you+want+character+wraping|1331701|方法3:|1331702|直通故事板|1331703|要显示设置为0(零)的多行，这将在标签中显示多行。|1331704|如果要显示n行，请设置n。|1331705|请参见下面的屏幕。|1331706|​|1331707|📷|atomic|1331708|1331709|如果要为标注设置最小字体大小，请单击自动收缩并选择最小字体大小选项|1331710|请参见下面的屏幕|1331711|1331712|1331713|1331714|在此设置最小字体大小|1331715|示例:9(在此图像中)|1331716|如果标签在此时获得更多文本，则标签文本将缩小到9|1331717|1331718|1331719|1331720|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/50e23986aa335e05d6054effa43bb094.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/fc41d475710fd5231351f4512a10643f.png|2|https://ask.qcloudimg.com/http-save/yehe-900000/907e9c7486d66224c091deea4b029a9d.png^0|0|4|0|0|0|0|0|0|0|4|0|0|0|0|4|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|1|1|0|0|0|0|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|27|8|@$9|28|A|29|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|2A|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|2B|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|2C|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|2D|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|2E|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|2F|8|@$9|2G|A|2H|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|2I|8|@]|D|@]|E|$]]|$1|W|3|X|5|H|7|2J|8|@]|D|@]|E|$I|J]]|$1|Y|3|Z|5|6|7|2K|8|@$9|2L|A|2M|B|C]]|D|@]|E|$]]|$1|10|3|11|5|6|7|2N|8|@]|D|@]|E|$]]|$1|12|3|13|5|6|7|2O|8|@]|D|@]|E|$]]|$1|14|3|15|5|6|7|2P|8|@]|D|@]|E|$]]|$1|16|3|17|5|6|7|2Q|8|@]|D|@]|E|$]]|$1|18|3|19|5|6|7|2R|8|@]|D|@]|E|$]]|$1|1A|3|1B|5|1C|7|2S|8|@]|D|@$9|2T|A|2U|1|2V]]|E|$]]|$1|1D|3|19|5|6|7|2W|8|@]|D|@]|E|$]]|$1|1E|3|1F|5|6|7|2X|8|@]|D|@]|E|$]]|$1|1G|3|1H|5|6|7|2Y|8|@]|D|@]|E|$]]|$1|1I|3|19|5|6|7|2Z|8|@]|D|@]|E|$]]|$1|1J|3|1B|5|1C|7|30|8|@]|D|@$9|31|A|32|1|33]]|E|$]]|$1|1K|3|19|5|6|7|34|8|@]|D|@]|E|$]]|$1|1L|3|1M|5|6|7|35|8|@]|D|@]|E|$]]|$1|1N|3|1O|5|6|7|36|8|@]|D|@]|E|$]]|$1|1P|3|1Q|5|6|7|37|8|@]|D|@]|E|$]]|$1|1R|3|19|5|6|7|38|8|@]|D|@]|E|$]]|$1|1S|3|1B|5|1C|7|39|8|@]|D|@$9|3A|A|3B|1|3C]]|E|$]]|$1|1T|3|19|5|6|7|3D|8|@]|D|@]|E|$]]|$1|1U|3|-4|5|6|7|3E|8|@]|D|@]|E|$]]]|1V|$1W|$5|1X|1Y|1Z|E|$20|21|22|-4]]|23|$5|1X|1Y|1Z|E|$20|24|22|-4]]|25|$5|1X|1Y|1Z|E|$20|26|22|-4]]]]

Method 1:

<pre><code>extension UILabel {//Write this extension after close brackets of your class
 func lblFunction() {
 numberOfLines = 0
 lineBreakMode = .byWordWrapping//If you want word wraping
 //OR
 lineBreakMode = .byCharWrapping//If you want character wraping
 }
}
</code></pre>

Now call simply like this 

<pre><code>myLbl.lblFunction()//Replace your label name 
</code></pre>

EX: 

<pre><code>Import UIKit

class MyClassName: UIViewController {//For example this is your class. 

 override func viewDidLoad() {
 super.viewDidLoad()

 myLbl.lblFunction()//Replace your label name 

 }

}//After close of your class write this extension.

extension UILabel {//Write this extension after close brackets of your class
 func lblFunction() {
 numberOfLines = 0
 lineBreakMode = .byWordWrapping//If you want word wraping
 //OR
 lineBreakMode = .byCharWrapping//If you want character wraping
 }
}
</code></pre>

Method 2:

Programmatically

<pre><code>yourLabel.numberOfLines = 0
yourLabel.lineBreakMode = .byWordWrapping//If you want word wraping
//OR
yourLabel.lineBreakMode = .byCharWrapping//If you want character wraping
</code></pre>

Method 3:

Through Story board

To display multiple lines set 0(Zero), this will display more than one line in your label.

If you want to display n lines, set n.

See below screen.

<a href="https://i.stack.imgur.com/HHEm6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HHEm6.png" alt="enter image description here"></a>

If you want to set minimum font size for label Click Autoshrink and Select Minimum Font Size option

See below screens

<a href="https://i.stack.imgur.com/hGDFi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hGDFi.png" alt="enter image description here"></a>

Here set minimum font size

EX: 9 (In this image)

If your label get more text at that time your label text will be shrink upto 9

<a href="https://i.stack.imgur.com/cHoi7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cHoi7.png" alt="enter image description here"></a>

blocks|key|28842|text|这些东西帮助了我|type|unstyled|depth|inlineStyleRanges|entityRanges|data|28843|更改UILabel的这些属性|28844|label.numberOfLines+=+0;
label.adjustsFontSizeToFitWidth+=+NO;
label.lineBreakMode+=+NSLineBreakByWordWrapping;|code-block|syntax|javascript|28845|在给出输入字符串时，使用\n在不同的行中显示不同的单词。|28846|示例：|28847|+NSString+*message+=+@"This+\n+is+\n+a+demo+\n+message+for+\n+stackoverflow"+;|28848|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

These things helped me 

Change these properties of UILabel 

<pre><code>label.numberOfLines = 0;
label.adjustsFontSizeToFitWidth = NO;
label.lineBreakMode = NSLineBreakByWordWrapping;
</code></pre>

And while giving input String use \n to display different words in different lines.

Example :

<pre><code> NSString *message = @"This \n is \n a demo \n message for \n stackoverflow" ;
</code></pre>

blocks|key|28693|text|UILabel+*labelName+=+[[UILabel+alloc]+initWithFrame:CGRectMake(0,+0,+100,+30)];
[labelName+sizeToFit];
labelName.numberOfLines+=+0;
labelName.text+=+@"Your+String...";
[self.view+addSubview:labelName];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|28694|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>UILabel *labelName = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 30)];
[labelName sizeToFit];
labelName.numberOfLines = 0;
labelName.text = @"Your String...";
[self.view addSubview:labelName];
</code></pre>

blocks|key|28720|text|你也可以通过Storyboard做到这一点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|28721|28722|在属性检查器中选择视图控制器上的标签|ordered-list-item|28723|，增加线选项的值(按Alt%2BCmd%2B4以显示属性并单击视图控制器中的标签并写入或粘贴您的文本|28724|调整标签大小和/或增加字体大小，以便可以显示整个文本|28725|28726|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

You can do that via the Storyboard too: 

<ol>
<li>Select the Label on the view controller</li>
<li>In the Attribute Inspector, increase the value of the Line option (Press Alt+Cmd+4 to show Attributes Inspector)</li>
<li>Double click the Label in the view controller and write or paste your text</li>
<li>Resize the Label and/or increase the font size so that the whole text could be shown</li>
</ol>

blocks|key|1331564|text|你应该试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1331565|-(CGFloat)dynamicLblHeight:(UILabel+*)lbl
{
++++CGFloat+lblWidth+=+lbl.frame.size.width;
++++CGRect+lblTextSize+=+[lbl.text+boundingRectWithSize:CGSizeMake(lblWidth,+MAXFLOAT)
+++++++++++++++++++++++++++++++++++++++++++++++options:NSStringDrawingUsesLineFragmentOrigin
++++++++++++++++++++++++++++++++++++++++++++attributes:@{NSFontAttributeName:lbl.font}
+++++++++++++++++++++++++++++++++++++++++++++++context:nil];
++++return+lblTextSize.size.height;
}|code-block|syntax|javascript|1331566|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|$]]

you should try this:

<pre><code>-(CGFloat)dynamicLblHeight:(UILabel *)lbl
{
 CGFloat lblWidth = lbl.frame.size.width;
 CGRect lblTextSize = [lbl.text boundingRectWithSize:CGSizeMake(lblWidth, MAXFLOAT)
 options:NSStringDrawingUsesLineFragmentOrigin
 attributes:@{NSFontAttributeName:lbl.font}
 context:nil];
 return lblTextSize.size.height;
}
</code></pre>

blocks|key|4149317|text|Swift+4：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4149318|label.lineBreakMode+=+.byWordWrapping

label.numberOfLines+=+0

label.translatesAutoresizingMaskIntoConstraints+=+false

label.preferredMaxLayoutWidth+=+superview.bounds.size.width+-+10+|code-block|syntax|javascript|4149319|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>label.lineBreakMode = .byWordWrapping

label.numberOfLines = 0

label.translatesAutoresizingMaskIntoConstraints = false

label.preferredMaxLayoutWidth = superview.bounds.size.width - 10 
</code></pre>

blocks|key|1331488|text|UILabel+*textLabel+=+[[UILabel+alloc]+initWithFrame:CGRectMake(0,+0,+150,+30)];
[textLabel+sizeToFit];
textLabel.numberOfLines+=+0;
textLabel.text+=+@"Your+String...";|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1331489|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>UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 150, 30)];
[textLabel sizeToFit];
textLabel.numberOfLines = 0;
textLabel.text = @"Your String...";
</code></pre>

blocks|key|932354|text|已经回答了，但您也可以在故事板中手动完成。在标签的属性检查器下，可以将换行符更改为换行(或字符换行)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|932355|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Already answered, but you can do it manually in the storyboard too. Under Attributes Inspector for the Label, you can change Line Breaks to Word Wrap (or character wrap).

blocks|key|4149066|text|在此函数中，传递要在label中分配的字符串，并传递字体大小来代替self.activityFont，传递label+width来代替235，现在您可以根据字符串获得标签高度。它会工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4149067|-(float)calculateLabelStringHeight:(NSString+*)answer
{
++++CGRect+textRect+=+[answer+boundingRectWithSize:+CGSizeMake(235,+10000000)+options:NSStringDrawingUsesLineFragmentOrigin+attributes:@{NSFontAttributeName:self.activityFont}+context:nil];
++++return+textRect.size.height;

}|code-block|syntax|javascript|4149068|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|$]]

In this function pass string that you want to assign in label and pass font size in place of self.activityFont and pass label width in place of 235, now you get label height according to your string.
it will work fine. 

<pre><code>-(float)calculateLabelStringHeight:(NSString *)answer
{
 CGRect textRect = [answer boundingRectWithSize: CGSizeMake(235, 10000000) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.activityFont} context:nil];
 return textRect.size.height;

}
</code></pre>

blocks|key|932490|text|在下面的代码或情节提要中设置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|932491|Label.lineBreakMode+=+NSLineBreakByWordWrapping；Label.numberOfLines+=+0；|932492|请不要忘记为标签设置左、右、上和下约束，否则它将不起作用。|932493|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|$]]

Set below either in code or in storyboard itself

Label.lineBreakMode = NSLineBreakByWordWrapping;
Label.numberOfLines = 0;

and please don't forget to set left, right, top and bottom constraints for label otherwise it won't work.

blocks|key|932819|text|哦，在2021年，我被一个标签文本困住了，一个小时内无法更改行，然后意识到我忘记设置标签的宽度，WTF。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|932820|let+stepLabel:+UILabel+=+{
++++let+label+=+UILabel()
++++label.translatesAutoresizingMaskIntoConstraints+=+false
++++label.textAlignment+=+.center
++++label.lineBreakMode+=+.byWordWrapping
++++label.numberOfLines+=+0
++++label.text+=+"Put+your+device+and+computer+under+same+Wi-Fi+network."
++++
++++return+label
}()

override+func+viewDidLoad()+{
++++super.viewDidLoad()
++++
++++view.backgroundColor+=+.white
++++view.addSubview(stepLabel)

++++NSLayoutConstraint.activate([
++++++++stepLabel.centerXAnchor.constraint(equalTo:+view.centerXAnchor),
++++++++stepLabel.centerYAnchor.constraint(equalTo:+view.centerYAnchor),
++++++++stepLabel.widthAnchor.constraint(equalTo:+view.widthAnchor,+multiplier:+0.7)
++++])
}|code-block|syntax|javascript|932821|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|$]]

Oh, in 2021 I'm trapped by a label text unable to change lines for 1 hour, then realize I forget to set label's width, WTF.
<pre><code>let stepLabel: UILabel = {
 let label = UILabel()
 label.translatesAutoresizingMaskIntoConstraints = false
 label.textAlignment = .center
 label.lineBreakMode = .byWordWrapping
 label.numberOfLines = 0
 label.text = &quot;Put your device and computer under same Wi-Fi network.&quot;
 
 return label
}()

override func viewDidLoad() {
 super.viewDidLoad()
 
 view.backgroundColor = .white
 view.addSubview(stepLabel)

 NSLayoutConstraint.activate([
 stepLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
 stepLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor),
 stepLabel.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.7)
 ])
}
</code></pre>

blocks|key|4149309|text|在C#上，这对我在UITableViewCell内部是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4149310|++++++++UILabel+myLabel+=+new+UILabel();
++++++++myLabel.Font+=+UIFont.SystemFontOfSize(16);
++++++++myLabel.Lines+=+0;
++++++++myLabel.TextAlignment+=+UITextAlignment.Left;
++++++++myLabel.LineBreakMode+=+UILineBreakMode.WordWrap;
++++++++myLabel.MinimumScaleFactor+=+1;
++++++++myLabel.AdjustsFontSizeToFitWidth+=+true;

+++++++myLabel.InvalidateIntrinsicContentSize();
+++++++myLabel.Frame+=+new+CoreGraphics.CGRect(20,+mycell.ContentView.Frame.Y+%2B+20,+cell.ContentView.Frame.Size.Width+-+40,+mycell.ContentView.Frame.Size.Height);
+++++++myCell.ContentView.AddSubview(myLabel);|code-block|syntax|javascript|4149311|我想这里的重点是：|4149312|++++++++++++myLabel.TextAlignment+=+UITextAlignment.Left;
++++++++++++myLabel.LineBreakMode+=+UILineBreakMode.WordWrap;
++++++++++++myLabel.MinimumScaleFactor+=+1;
++++++++++++myLabel.AdjustsFontSizeToFitWidth+=+true;|4149313|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|$]]

On C#, this worked for me inside UITableViewCell.

<pre><code> UILabel myLabel = new UILabel();
 myLabel.Font = UIFont.SystemFontOfSize(16);
 myLabel.Lines = 0;
 myLabel.TextAlignment = UITextAlignment.Left;
 myLabel.LineBreakMode = UILineBreakMode.WordWrap;
 myLabel.MinimumScaleFactor = 1;
 myLabel.AdjustsFontSizeToFitWidth = true;

 myLabel.InvalidateIntrinsicContentSize();
 myLabel.Frame = new CoreGraphics.CGRect(20, mycell.ContentView.Frame.Y + 20, cell.ContentView.Frame.Size.Width - 40, mycell.ContentView.Frame.Size.Height);
 myCell.ContentView.AddSubview(myLabel);
</code></pre>

I think the point here is:-

<pre><code> myLabel.TextAlignment = UITextAlignment.Left;
 myLabel.LineBreakMode = UILineBreakMode.WordWrap;
 myLabel.MinimumScaleFactor = 1;
 myLabel.AdjustsFontSizeToFitWidth = true;
</code></pre>

blocks|key|1329205|text|此代码根据文本返回大小高度|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1329206|%2B+(CGFloat)findHeightForText:(NSString+*)text+havingWidth:(CGFloat)widthValue+andFont:(UIFont+*)font
+{
++++CGFloat+result+=+font.pointSize%2B4;
++++if+(text)+
{
++++++++CGSize+size;

++++++++CGRect+frame+=+[text+boundingRectWithSize:CGSizeMake(widthValue,+999)
++++++++++++++++++++++++++++++++++++++++++options:NSStringDrawingUsesLineFragmentOrigin
+++++++++++++++++++++++++++++++++++++++attributes:@{NSFontAttributeName:font}
++++++++++++++++++++++++++++++++++++++++++context:nil];
++++++++size+=+CGSizeMake(frame.size.width,+frame.size.height%2B1);
++++++++result+=+MAX(size.height,+result);+//At+least+one+row
++++}
++++return+result;
}|code-block|syntax|javascript|1329207|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 code is returning size height according to text

<pre><code>+ (CGFloat)findHeightForText:(NSString *)text havingWidth:(CGFloat)widthValue andFont:(UIFont *)font
 {
 CGFloat result = font.pointSize+4;
 if (text) 
{
 CGSize size;

 CGRect frame = [text boundingRectWithSize:CGSizeMake(widthValue, 999)
 options:NSStringDrawingUsesLineFragmentOrigin
 attributes:@{NSFontAttributeName:font}
 context:nil];
 size = CGSizeMake(frame.size.width, frame.size.height+1);
 result = MAX(size.height, result); //At least one row
 }
 return result;
}
</code></pre>

Is there a way to have multiple lines of text in <code>UILabel</code> like in the <code>UITextView</code> or should I use the second one instead?

Multiple lines of text in UILabel

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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有没有一种方法可以像UITextView一样在UILabel中使用多行文本，或者我应该使用第二行？

问UILabel中的多行文本
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回答 26

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回答 26

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问UILabel中的多行文本
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