blocks|key|411912|text|首先，您应该知道UIButton内部已经有一个UILabel。您可以使用–setTitle:forState:设置它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|411913|您的示例的问题在于，您需要将UILabel的numberOfLines属性设置为默认值1以外的值。您还应该检查lineBreakMode属性。|411914|entityMap^0|10|J|0|M|D|1J|D|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

First of all, you should be aware that UIButton already has a UILabel inside it. You can set it using <code>–setTitle:forState:</code>.

The problem with your example is that you need to set UILabel's <code>numberOfLines</code> property to something other than its default value of 1. You should also review the <code>lineBreakMode</code> property.

blocks|key|4477051|text|虽然可以向控件添加子视图，但不能保证它会真正工作，因为控件可能不会期望它在那里，因此可能会表现不佳。如果可以，只需将标签添加为按钮的同级视图，并设置它的框架，使其与按钮重叠；只要它被设置为显示在按钮顶部，按钮就不会遮挡它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4477052|换句话说：|4477053|[button.superview+addSubview:myLabel];
myLabel.center+=+button.center;|code-block|syntax|javascript|4477054|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|$]]

Although it's okay to add a subview to a control, there's no guarantee it'll actually work, because the control might not expect it to be there and might thus behave poorly. If you can get away with it, just add the label as a sibling view of the button and set its frame so that it overlaps the button; as long as it's set to appear on top of the button, nothing the button can do will obscure it.

In other words:

<pre><code>[button.superview addSubview:myLabel];
myLabel.center = button.center;
</code></pre>

blocks|key|1073613|text|至于布伦特将标题UILabel作为兄弟视图的想法，在我看来这不是一个很好的想法。我一直在思考与UILabel的交互问题，因为它的触摸事件没有通过UIButton的视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1073614|另一方面，使用UILabel作为UIButton的子视图，我很高兴知道触摸事件将总是传播到UILabel的superview。|1073615|我确实采用了这种方法，没有注意到backgroundImage报告的任何问题。我在UIButton子类的-titleRectForContentRect:中添加了这段代码，但代码也可以放在UIButton+superview的绘图例程中，在这种情况下，您应该用UIButton的变量替换对self的所有引用。|1073616|#define+TITLE_LABEL_TAG+1234

-+(CGRect)titleRectForContentRect:(CGRect)rect
{+++
++++//+define+the+desired+title+inset+margins+based+on+the+whole+rect+and+its+padding
++++UIEdgeInsets+padding+=+[self+titleEdgeInsets];
++++CGRect+titleRect+=+CGRectMake(rect.origin.x++++%2B+padding.left,+
++++++++++++++++++++++++++++++++++rect.origin.x++++%2B+padding.top,+
++++++++++++++++++++++++++++++++++rect.size.width++-+(padding.right+%2B+padding.left),+
++++++++++++++++++++++++++++++++++rect.size.height+-+(padding.bottom+%2B+padding].top));

++++//+save+the+current+title+view+appearance
++++NSString+*title+=+[self+currentTitle];
++++UIColor++*titleColor+=+[self+currentTitleColor];
++++UIColor++*titleShadowColor+=+[self+currentTitleShadowColor];

++++//+we+only+want+to+add+our+custom+label+once;+only+1st+pass+shall+return+nil
++++UILabel++*titleLabel+=+(UILabel*)[self+viewWithTag:TITLE_LABEL_TAG];


++++if+(!titleLabel)+
++++{
++++++++//+no+custom+label+found+(1st+pass),+we+will+be+creating+&+adding+it+as+subview
++++++++titleLabel+=+[[UILabel+alloc]+initWithFrame:titleRect];
++++++++[titleLabel+setTag:TITLE_LABEL_TAG];

++++++++//+make+it+multi-line
++++++++[titleLabel+setNumberOfLines:0];
++++++++[titleLabel+setLineBreakMode:UILineBreakModeWordWrap];

++++++++//+title+appearance+setup;+be+at+will+to+modify
++++++++[titleLabel+setBackgroundColor:[UIColor+clearColor]];
++++++++[titleLabel+setFont:[self+font]];
++++++++[titleLabel+setShadowOffset:CGSizeMake(0,+1)];
++++++++[titleLabel+setTextAlignment:UITextAlignmentCenter];

++++++++[self+addSubview:titleLabel];
++++++++[titleLabel+release];
++++}

++++//+finally,+put+our+label+in+original+title+view's+state
++++[titleLabel+setText:title];
++++[titleLabel+setTextColor:titleColor];
++++[titleLabel+setShadowColor:titleShadowColor];

++++//+and+return+empty+rect+so+that+the+original+title+view+is+hidden
++++return+CGRectZero;
}|code-block|syntax|javascript|1073617|我确实花了一些时间，写了一些关于这个here的内容。在那里，我还指出了一个较短的解决方案，尽管它并不完全适合所有的场景，并且涉及一些私人视图黑客。在那里，您还可以下载一个可供使用的UIButton子类。|offset|length|1073618|entityMap|0|LINK|mutability|MUTABLE|url|http://unsolicitedfeedback.com/2009/03/09/how-to-set-a-multi-line-title-in-uibutton^0|0|0|0|0|I|4|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]]]]

As to Brent's idea of putting the title UILabel as sibling view, it doesn't seem to me like a very good idea. I keep thinking in interaction problems with the UILabel due to its touch events not getting through the UIButton's view. 

On the other hand, with a UILabel as subview of the UIButton, I'm pretty confortable knowing that the touch events will always be propagated to the UILabel's superview.

I did take this approach and didn't notice any of the problems reported with backgroundImage. I added this code in the -titleRectForContentRect: of a UIButton subclass but the code can also be placed in drawing routine of the UIButton superview, which in that case you shall replace all references to self with the UIButton's variable.

<pre><code>#define TITLE_LABEL_TAG 1234

- (CGRect)titleRectForContentRect:(CGRect)rect
{ 
 // define the desired title inset margins based on the whole rect and its padding
 UIEdgeInsets padding = [self titleEdgeInsets];
 CGRect titleRect = CGRectMake(rect.origin.x + padding.left, 
 rect.origin.x + padding.top, 
 rect.size.width - (padding.right + padding.left), 
 rect.size.height - (padding.bottom + padding].top));

 // save the current title view appearance
 NSString *title = [self currentTitle];
 UIColor *titleColor = [self currentTitleColor];
 UIColor *titleShadowColor = [self currentTitleShadowColor];

 // we only want to add our custom label once; only 1st pass shall return nil
 UILabel *titleLabel = (UILabel*)[self viewWithTag:TITLE_LABEL_TAG];


 if (!titleLabel) 
 {
 // no custom label found (1st pass), we will be creating &amp; adding it as subview
 titleLabel = [[UILabel alloc] initWithFrame:titleRect];
 [titleLabel setTag:TITLE_LABEL_TAG];

 // make it multi-line
 [titleLabel setNumberOfLines:0];
 [titleLabel setLineBreakMode:UILineBreakModeWordWrap];

 // title appearance setup; be at will to modify
 [titleLabel setBackgroundColor:[UIColor clearColor]];
 [titleLabel setFont:[self font]];
 [titleLabel setShadowOffset:CGSizeMake(0, 1)];
 [titleLabel setTextAlignment:UITextAlignmentCenter];

 [self addSubview:titleLabel];
 [titleLabel release];
 }

 // finally, put our label in original title view's state
 [titleLabel setText:title];
 [titleLabel setTextColor:titleColor];
 [titleLabel setShadowColor:titleShadowColor];

 // and return empty rect so that the original title view is hidden
 return CGRectZero;
}
</code></pre>

I did take the time and wrote a bit more about this <a href="http://unsolicitedfeedback.com/2009/03/09/how-to-set-a-multi-line-title-in-uibutton" rel="nofollow noreferrer">here</a>. There, I also point a shorter solution, though it doesn't quite fit all the scenarios and involves some private views hacking. Also there, you can download an UIButton subclass ready to be used.

blocks|key|3630688|text|滚动您自己的按钮类。从长远来看，这是最好的解决方案。UIButton和其他UIKit类在自定义它们的方式上有很大限制。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3630689|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|$]]

Roll your own button class. It's by far the best solution in the long run. UIButton and other UIKit classes are very restrictive in how you can customize them.

blocks|key|1068666|text|有一种更简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068667|someButton.lineBreakMode+=+UILineBreakModeWordWrap;|code-block|syntax|javascript|1068668|(为iOS+3和更高版本编辑：)|1068669|someButton.titleLabel.lineBreakMode+=+UILineBreakModeWordWrap;|1068670|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|$]]

There is a much easier way:

<pre><code>someButton.lineBreakMode = UILineBreakModeWordWrap;
</code></pre>

(Edit for iOS 3 and later:)

<pre><code>someButton.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
</code></pre>

blocks|key|412153|text|对于iOS+6和更高版本，请使用以下命令来允许多行：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|412154|button.titleLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
//+you+probably+want+to+center+it
button.titleLabel.textAlignment+=+NSTextAlignmentCenter;+//+if+you+want+to+
[button+setTitle:+@"Line1\nLine2"+forState:+UIControlStateNormal];|code-block|syntax|javascript|412155|适用于iOS+5及更低版本的使用以下命令来允许多行：|412156|button.titleLabel.lineBreakMode+=+UILineBreakModeWordWrap;
//+you+probably+want+to+center+it
button.titleLabel.textAlignment+=+UITextAlignmentCenter;
[button+setTitle:+@"Line1\nLine2"+forState:+UIControlStateNormal];|412157|2017，对于iOS9+forward，|412158|一般来说，只需要做这两件事：|412159|Break+the+>+Wrap"“|412160|choose+"Attributed+|ordered-list-item|412161|”换行“弹出式select+"Word+Wrap”|412162|412163|412164|entityMap^0|0|Q|0|0|E|C|0|0|0|J|0|0|0|7|C|1|0|P|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1E|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1F|8|@]|D|@]|E|$]]|$1|U|3|V|5|W|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|X|3|Y|5|W|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|11|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|12|$]]

For iOS 6 and above, use the following to allow multiple lines:

<pre><code>button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
// you probably want to center it
button.titleLabel.textAlignment = NSTextAlignmentCenter; // if you want to 
[button setTitle: @"Line1\nLine2" forState: UIControlStateNormal];
</code></pre>

For iOS 5 and below use the following to allow multiple lines:

<pre><code>button.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
// you probably want to center it
button.titleLabel.textAlignment = UITextAlignmentCenter;
[button setTitle: @"Line1\nLine2" forState: UIControlStateNormal];
</code></pre>

2017, for iOS9 forward,

generally, just do these two things:

<ol>
<li>choose "Attributed Text"</li>
<li>on the "Line Break" popup select "Word Wrap"</li>
</ol>

blocks|key|412192|text|重申罗杰·诺兰的建议，但使用明确的代码，这是一般的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412193|button.titleLabel?.numberOfLines+=+0|code-block|syntax|javascript|412194|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|$]]

To restate Roger Nolan's suggestion, but with explicit code, this is the general solution:

<pre><code>button.titleLabel?.numberOfLines = 0
</code></pre>

blocks|key|3630847|text|它工作得很完美。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3630848|要在Plist这样的配置文件中使用它，需要使用CDATA来编写多行标题，如下所示：|3630849|<string><![CDATA[Line1
Line2]]></string>|code-block|syntax|javascript|3630850|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|$]]

It works perfectly.

Add to use this with config file like Plist, you need to use CDATA to write the multilined title, like this:

<pre><code>&lt;string&gt;&lt;![CDATA[Line1
Line2]]&gt;&lt;/string&gt;
</code></pre>

blocks|key|4477360|text|对于那些正在使用Xcode+4的故事板的用户，您可以单击该按钮，在属性检查器下的右侧Utilities窗格中，您将看到一个换行选项。选择Word+Wrap，您就可以开始工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4477361|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|$]]

For those who are using Xcode 4's storyboard, you can click on the button, and on the right side Utilities pane under Attributes Inspector, you'll see an option for Line Break. Choose Word Wrap, and you should be good to go.

blocks|key|1073795|text|对于IOS+6：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1073796|button.titleLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
button.titleLabel.textAlignment+=+NSTextAlignmentCenter;|code-block|syntax|javascript|1073797|作为|1073798|UILineBreakModeWordWrap+and+UITextAlignmentCenter|1073799|在IOS+6及更高版本中已被弃用。|1073800|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

For IOS 6 :

<pre><code>button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
button.titleLabel.textAlignment = NSTextAlignmentCenter;
</code></pre>

As 

<pre><code>UILineBreakModeWordWrap and UITextAlignmentCenter
</code></pre>

are deprecated in IOS 6 onwards..

blocks|key|3631063|text|这里的答案告诉你如何以编程方式实现多行按钮标题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3631064|我只想补充一点，如果你使用的是故事板，你可以在按钮标题字段中输入Ctrl%2BEnter强制换行。|3631065|HTH|3631066|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|$]]

Answers here tell you how to achieve multiline button title programmatically. 

I just wanted to add that if you are using storyboards, you can type [Ctrl+Enter] to force a newline on a button title field. 

HTH

blocks|key|3631094|text|如果在iOS+6上使用自动布局，则可能还需要设置preferredMaxLayoutWidth属性：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3631095|button.titleLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
button.titleLabel.textAlignment+=+NSTextAlignmentCenter;
button.titleLabel.preferredMaxLayoutWidth+=+button.frame.size.width;|code-block|syntax|javascript|3631096|entityMap^0|O|N|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|$]]

If you use auto-layout on iOS 6 you might also need to set the <code>preferredMaxLayoutWidth</code> property:

<pre><code>button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
button.titleLabel.textAlignment = NSTextAlignmentCenter;
button.titleLabel.preferredMaxLayoutWidth = button.frame.size.width;
</code></pre>

blocks|key|412453|text|使用自动布局在iOS7上左对齐：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412454|button.titleLabel.lineBreakMode+=+NSLineBreakByWordWrapping;
button.titleLabel.textAlignment+=+NSTextAlignmentLeft;
button.contentHorizontalAlignment+=+UIControlContentHorizontalAlignmentLeft;|code-block|syntax|javascript|412455|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|$]]

Left align on iOS7 with autolayout:

<pre><code>button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
button.titleLabel.textAlignment = NSTextAlignmentLeft;
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
</code></pre>

blocks|key|1068916|text|选择的答案是正确的，但如果您更喜欢在Interface+Builder中执行此类操作，则可以执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068917|​|1068918|📷|atomic|offset|length|1068919|1068920|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/46ba268e70047ec3bc55954396d499ab.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

The selected answer is correct but if you prefer to do this sort of thing in Interface Builder you can do this:

<img src="https://i.stack.imgur.com/Qk9Bg.png" alt="pic">

blocks|key|1073910|text|将lineBreakMode设置为NSLineBreakByWordWrapping+(在IB或code中)会使按钮标签多行，但不会影响按钮的框架。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1073911|如果按钮有动态标题，有一个诀窍:将隐藏的UILabel与相同的字体，并将其高度与按钮的高度与布局；当设置文本按钮和标签和自动布局将使所有的工作。|1073912|便笺|offset|length|style|BOLD|1073913|单行按钮的固有尺寸高度大于标签的高度，因此为了防止标签的高度收缩，它的垂直内容拥抱优先级必须大于按钮的垂直内容压缩阻力。|1073914|entityMap^0|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@$F|Q|G|R|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

Setting lineBreakMode to NSLineBreakByWordWrapping (either in IB or code) makes button label multiline, but doesn't affect button's frame.

If button has dynamic title, there is one trick: put hidden UILabel with same font and tie it's height to button's height with layout; when set text to button and label and autolayout will make all the work.

Note

Intrinsic size height of one-line button is bigger than label's, so to prevent label's height shrink it's vertical Content Hugging Priority must be greater than button's vertical Content Compression Resistance.

blocks|key|3631359|text|如果要添加标题以多行居中的按钮，请设置该按钮的界面生成器设置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3631360|[|3631361|📷|atomic|offset|length|3631362|]|3631363|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/af72308cfa761f0947a9483b3c83476a.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|V|8|@]|9|@$G|W|H|X|1|Y]]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R|S|-4]]]]

If you want to add a button with the title centered with multiple lines, set your Interface Builder's settings for the button:

[<img src="https://i.stack.imgur.com/xZaOC.png" alt="here">]

blocks|key|1068981|text|如果您使用自动布局。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068982|button.titleLabel?.adjustsFontSizeToFitWidth+=+true
button.titleLabel?.numberOfLines+=+2|code-block|syntax|javascript|1068983|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|$]]

If you use auto-layout.

<pre><code>button.titleLabel?.adjustsFontSizeToFitWidth = true
button.titleLabel?.numberOfLines = 2
</code></pre>

blocks|key|4477695|text|SWIFT+3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4477696|button.titleLabel?.lineBreakMode+=+.byWordWrapping
button.titleLabel?.textAlignment+=+.center++
button.setTitle("Button\nTitle",for:+.normal)|code-block|syntax|javascript|4477697|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|$]]

<h1>SWIFT 3</h1>
<pre><code>button.titleLabel?.lineBreakMode = .byWordWrapping
button.titleLabel?.textAlignment = .center 
button.setTitle(&quot;Button\nTitle&quot;,for: .normal)
</code></pre>

blocks|key|4477703|text|self.btnError.titleLabel?.lineBreakMode+=+NSLineBreakMode.byWordWrapping

self.btnError.titleLabel?.textAlignment+=+.center

self.btnError.setTitle("Title",+for:+.normal)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4477704|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>self.btnError.titleLabel?.lineBreakMode = NSLineBreakMode.byWordWrapping

self.btnError.titleLabel?.textAlignment = .center

self.btnError.setTitle("Title", for: .normal)
</code></pre>

blocks|key|4477720|text|您必须添加以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4477721|buttonLabel.titleLabel.numberOfLines+=+0;|code-block|syntax|javascript|4477722|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 have to add this code:

<pre><code>buttonLabel.titleLabel.numberOfLines = 0;
</code></pre>

blocks|key|1069017|text|swift+4.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1069018|btn.titleLabel?.lineBreakMode+=+.byWordWrapping
btn.titleLabel?.textAlignment+=+.center
btn.setTitle(+"Line1\nLine2",+for:+.normal)|code-block|syntax|javascript|1069019|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 4.0

<pre><code>btn.titleLabel?.lineBreakMode = .byWordWrapping
btn.titleLabel?.textAlignment = .center
btn.setTitle( "Line1\nLine2", for: .normal)
</code></pre>

blocks|key|3631512|text|我将jessecurry's+answer合并到STAButton中，这是我的STAControls开源库的一部分。我目前在我正在开发的一个应用程序中使用它，它可以满足我的需求。请随时打开关于如何改进它的问题，或发送给我拉请求。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3631513|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/1829420/347339|1|https://github.com/Stunner/STAControls/blob/master/STAControls/STAControls/Button/STAButton.h|2|https://github.com/Stunner/STAControls^0|2|J|0|O|9|1|13|B|2|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]|N|$5|G|H|I|C|$J|O]]]]

I incorporated <a href="https://stackoverflow.com/a/1829420/347339">jessecurry's answer</a> within <a href="https://github.com/Stunner/STAControls/blob/master/STAControls/STAControls/Button/STAButton.h" rel="nofollow noreferrer">STAButton</a> which is part of my <a href="https://github.com/Stunner/STAControls" rel="nofollow noreferrer">STAControls</a> open source library. I currently use it within one of the apps I am developing and it works for my needs. Feel free to open issues on how to improve it or send me pull requests.

blocks|key|3631580|text|在Xcode9.3中，可以像下面这样使用storyboard，|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3631581|​|3631582|📷|atomic|3631583|3631584|您需要将按钮标题textAlignment设置为居中|3631585|button.titleLabel?.textAlignment+=+.center|CODE|3631586|您不需要像下面这样用换行符(\n)设置标题文本，|3631587|button.setTitle("Good\nAnswer",for:+.normal)|3631588|只需设置标题，|3631589|button.setTitle("Good+Answer",for:+.normal)|3631590|这是结果，|3631591|3631592|3631593|3631594|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e7588baa8b1338d58b034f169f1f9f3e.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/51101239f6075f4beeadcfb21ceadc5e.png^0|K|A|0|0|0|1|0|0|0|0|0|16|0|0|0|18|0|0|0|17|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1H|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1I|8|@]|D|@$9|1J|A|1K|1|1L]]|E|$]]|$1|K|3|G|5|6|7|1M|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1N|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1O|8|@$9|1P|A|1Q|B|P]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1R|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1S|8|@$9|1T|A|1U|B|P]]|D|@]|E|$]]|$1|U|3|V|5|6|7|1V|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1W|8|@$9|1X|A|1Y|B|P]]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|10|3|G|5|6|7|20|8|@]|D|@]|E|$]]|$1|11|3|I|5|J|7|21|8|@]|D|@$9|22|A|23|1|24]]|E|$]]|$1|12|3|G|5|6|7|25|8|@]|D|@]|E|$]]|$1|13|3|-4|5|6|7|26|8|@]|D|@]|E|$]]]|14|$15|$5|16|17|18|E|$19|1A|1B|-4]]|1C|$5|16|17|18|E|$19|1D|1B|-4]]]]

In Xcode 9.3 you can do it by using storyboard like below,

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

You need to set button title textAlignment to center

<code>button.titleLabel?.textAlignment = .center</code>

You don't need to set title text with new line (\n) like below,

<code>button.setTitle("Good\nAnswer",for: .normal)</code>

Simply set title,

<code>button.setTitle("Good Answer",for: .normal)</code>

Here is the result,

<a href="https://i.stack.imgur.com/U0Uly.png" rel="noreferrer"><img src="https://i.stack.imgur.com/U0Uly.png" alt="enter image description here"></a>

blocks|key|1069096|text|如今，如果您确实需要在界面构建器中逐一访问此类内容，您可以使用如下所示的简单扩展来实现：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1069097|extension+UIButton+{
++++@IBInspectable+var+numberOfLines:+Int+{
++++++++get+{+return+titleLabel?.numberOfLines+??+1+}
++++++++set+{+titleLabel?.numberOfLines+=+newValue+}
++++}
}|code-block|syntax|javascript|1069098|然后，您可以简单地将numberOfLines设置为任何UIButton或UIButton子类的属性，就像它是一个标签一样。这同样适用于一大堆其他通常无法访问的值，例如视图图层的角半径，或者它投射的阴影的属性。|1069099|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|$]]

These days, if you really need this sort of thing to be accessible in interface builder on a case-by-case basis, you can do it with a simple extension like this:

<pre><code>extension UIButton {
 @IBInspectable var numberOfLines: Int {
 get { return titleLabel?.numberOfLines ?? 1 }
 set { titleLabel?.numberOfLines = newValue }
 }
}
</code></pre>

Then you can simply set numberOfLines as an attribute on any UIButton or UIButton subclass as if it were a label. The same goes for a whole host of other usually-inaccessible values, such as the corner radius of a view's layer, or the attributes of the shadow that it casts.

blocks|key|1074155|text|我遇到了自动布局的问题，在启用多行后，结果是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1074156|📷|atomic|offset|length|1074157|所以titleLabel的大小不会影响按钮的大小|style|CODE|1074158|我添加了基于contentEdgeInsets的Constraints+(在本例中，contentEdgeInsets是(10，10，10，10)+)|1074159|在调用makeMultiLineSupport()之后|1074160|1074161|希望它能帮助你(swift+5.0)：|1074162|extension+UIButton+{

++++func+makeMultiLineSupport()+{
++++++++guard+let+titleLabel+=+titleLabel+else+{
++++++++++++return
++++++++}
++++++++titleLabel.numberOfLines+=+0
++++++++titleLabel.setContentHuggingPriority(.required,+for:+.vertical)
++++++++titleLabel.setContentHuggingPriority(.required,+for:+.horizontal)
++++++++addConstraints([
++++++++++++.init(item:+titleLabel,
++++++++++++++++++attribute:+.top,
++++++++++++++++++relatedBy:+.greaterThanOrEqual,
++++++++++++++++++toItem:+self,
++++++++++++++++++attribute:+.top,
++++++++++++++++++multiplier:+1.0,
++++++++++++++++++constant:+contentEdgeInsets.top),
++++++++++++.init(item:+titleLabel,
++++++++++++++++++attribute:+.bottom,
++++++++++++++++++relatedBy:+.greaterThanOrEqual,
++++++++++++++++++toItem:+self,
++++++++++++++++++attribute:+.bottom,
++++++++++++++++++multiplier:+1.0,
++++++++++++++++++constant:+contentEdgeInsets.bottom),
++++++++++++.init(item:+titleLabel,
++++++++++++++++++attribute:+.left,
++++++++++++++++++relatedBy:+.greaterThanOrEqual,
++++++++++++++++++toItem:+self,
++++++++++++++++++attribute:+.left,
++++++++++++++++++multiplier:+1.0,
++++++++++++++++++constant:+contentEdgeInsets.left),
++++++++++++.init(item:+titleLabel,
++++++++++++++++++attribute:+.right,
++++++++++++++++++relatedBy:+.greaterThanOrEqual,
++++++++++++++++++toItem:+self,
++++++++++++++++++attribute:+.right,
++++++++++++++++++multiplier:+1.0,
++++++++++++++++++constant:+contentEdgeInsets.right)
++++++++++++])
++++}

}|code-block|syntax|javascript|1074163|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/7dc5354eae5cb8658f53f1741308d641.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/fc6bd4fd6ce7093eb53bd2684e15c36c.png^0|0|0|1|0|0|2|A|0|6|H|O|B|0|3|M|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|18|8|@]|9|@$E|19|F|1A|1|1B]]|A|$]]|$1|G|3|H|5|6|7|1C|8|@$E|1D|F|1E|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1F|8|@$E|1G|F|1H|I|J]|$E|1I|F|1J|I|J]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1K|8|@$E|1L|F|1M|I|J]]|9|@]|A|$]]|$1|O|3|C|5|D|7|1N|8|@]|9|@$E|1O|F|1P|1|1Q]]|A|$]]|$1|P|3|Q|5|6|7|1R|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1S|8|@]|9|@]|A|$U|V]]|$1|W|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13|14|-4]]|15|$5|Z|10|11|A|$12|16|14|-4]]]]

I had an issue with auto-layout, after enabling multi-line the result was like this: 
<a href="https://i.stack.imgur.com/AdaOn.png" rel="noreferrer"><img src="https://i.stack.imgur.com/AdaOn.png" alt="enter image description here"></a> 
so the <code>titleLabel</code> size doesn't affect the button size 
I've added <code>Constraints</code> based on <code>contentEdgeInsets</code> (in this case contentEdgeInsets was (10, 10, 10, 10) 
after calling <code>makeMultiLineSupport()</code>: 
<a href="https://i.stack.imgur.com/xz0Z3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xz0Z3.png" alt="enter image description here"></a> 
hope it helps you (swift 5.0): 

<pre class="lang-swift prettyprint-override"><code>extension UIButton {

 func makeMultiLineSupport() {
 guard let titleLabel = titleLabel else {
 return
 }
 titleLabel.numberOfLines = 0
 titleLabel.setContentHuggingPriority(.required, for: .vertical)
 titleLabel.setContentHuggingPriority(.required, for: .horizontal)
 addConstraints([
 .init(item: titleLabel,
 attribute: .top,
 relatedBy: .greaterThanOrEqual,
 toItem: self,
 attribute: .top,
 multiplier: 1.0,
 constant: contentEdgeInsets.top),
 .init(item: titleLabel,
 attribute: .bottom,
 relatedBy: .greaterThanOrEqual,
 toItem: self,
 attribute: .bottom,
 multiplier: 1.0,
 constant: contentEdgeInsets.bottom),
 .init(item: titleLabel,
 attribute: .left,
 relatedBy: .greaterThanOrEqual,
 toItem: self,
 attribute: .left,
 multiplier: 1.0,
 constant: contentEdgeInsets.left),
 .init(item: titleLabel,
 attribute: .right,
 relatedBy: .greaterThanOrEqual,
 toItem: self,
 attribute: .right,
 multiplier: 1.0,
 constant: contentEdgeInsets.right)
 ])
 }

}
</code></pre>

blocks|key|1069173|text|在Swift+5.0和Xcode+10.2中|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1069174|//UIButton+extension
extension+UIButton+{
+++++//UIButton+properties
+++++func+btnMultipleLines()+{
+++++++++titleLabel?.numberOfLines+=+0
+++++++++titleLabel?.lineBreakMode+=+.byWordWrapping
+++++++++titleLabel?.textAlignment+=+.center++++++++
+++++}
}|code-block|syntax|javascript|1069175|在ViewController调用中，如下所示|1069176|button.btnMultipleLines()//This+is+your+button|1069177|entityMap^0|1|9|B|A|0|0|1|E|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

In Swift 5.0 and Xcode 10.2

<pre><code>//UIButton extension
extension UIButton {
 //UIButton properties
 func btnMultipleLines() {
 titleLabel?.numberOfLines = 0
 titleLabel?.lineBreakMode = .byWordWrapping
 titleLabel?.textAlignment = .center 
 }
}
</code></pre>

In your ViewController call like this

<pre><code>button.btnMultipleLines()//This is your button
</code></pre>

blocks|key|4478087|text|Swift+5，用于UIButton中的多行文本|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4478088|++let+button+=+UIButton()
++button.titleLabel?.lineBreakMode+=+.byWordWrapping
++button.titleLabel?.textAlignment+=+.center
++button.titleLabel?.numberOfLines+=+0+//+for+Multi+line+text|code-block|syntax|javascript|4478089|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 5 , For multi Line text in UIButton

<pre><code> let button = UIButton()
 button.titleLabel?.lineBreakMode = .byWordWrapping
 button.titleLabel?.textAlignment = .center
 button.titleLabel?.numberOfLines = 0 // for Multi line text
</code></pre>

blocks|key|4478124|text|要将标题标签的间距固定到按钮上，请在setTitle之前设置titleEdgeInsets和其他属性：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4478125|++++let+button+=+UIButton()
++++button.titleLabel?.lineBreakMode+=+.byWordWrapping
++++button.titleLabel?.numberOfLines+=+0
++++button.titleEdgeInsets+=+UIEdgeInsets(top:+10,+left:+10,+bottom:+20,+right:+20)
++++button.setTitle("Dummy+button+with+long+long+long+long+long+long+long+long+title",+for:+.normal)|code-block|syntax|javascript|4478126|附注:我测试过不需要设置titleLabel?.textAlignment，并且标题在.natural中对齐。|CODE|4478127|entityMap^0|1E|1|0|0|0|1J|17|8|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|S|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|M]]|D|@]|E|$]]|$1|N|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|O|$]]

To fix title label's spacing to the button, set titleEdgeInsets and other properties before setTitle:
<pre><code> let button = UIButton()
 button.titleLabel?.lineBreakMode = .byWordWrapping
 button.titleLabel?.numberOfLines = 0
 button.titleEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 20, right: 20)
 button.setTitle(&quot;Dummy button with long long long long long long long long title&quot;, for: .normal)
</code></pre>
P.S. I tested setting titleLabel?.textAlignment is not necessary and the title aligns in <code>.natural</code>.

blocks|key|4478186|text|添加按钮约束和子视图。这就是我如何在我的项目中做到这一点，让我们说它像这样容易得多。我几乎99%25的时间都是通过编程来实现的..因为这对我来说容易多了。故事板有时真的会出问题1：https://i.stack.imgur.com/5ZSwl.png|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4478187|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/5ZSwl.png^0|2G|Z|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Adding Buttons constraints and subviews. This is how i do it in my projects, lets say its much easier like this. I literally 99% of my time making everything programmatically.. Since its much easier for me. Storyboard can be really buggy sometimes
[1]: <a href="https://i.stack.imgur.com/5ZSwl.png" rel="nofollow noreferrer">https://i.stack.imgur.com/5ZSwl.png</a>

blocks|key|4478235|text|在2021年的iOS+15中，苹果首次通过UIButton.Configuration接口正式支持多行UIButtons。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4478236|4478237|+UIButton.Configuration|blockquote|4478238|4478239|指定按钮及其内容的外观和行为的配置。|4478240|4478241|​|4478242|📷|atomic|4478243|4478244|这个新的应用编程接口在What's+new+in+UIKit和会话中都进行了探索：|4478245|4478246|与UIKit按钮系统相遇|4478247|4478248|每个应用程序都使用按钮。使用iOS+15，您可以采用更新的样式来创建华丽的按钮，轻松地融入到您的界面中。我们将探索使创建不同类型的按钮变得更容易的功能，学习如何提供更丰富的交互，并探索如何在使用Mac+Catalyst时获得出色的按钮。|4478249|https://developer.apple.com/videos/play/wwdc2021/10064/|4478250|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/uikit/uibutton/configuration|1|2|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/38a8ee10d6390e73c24b86adf3bbadff.png|imageAlt|3|https://developer.apple.com/videos/play/wwdc2021/10059/|4^0|L|M|0|0|0|1|M|1|0|0|0|0|0|0|1|2|0|0|B|J|3|0|0|0|0|0|0|1J|4|0^^$0|@$1|2|3|4|5|6|7|1J|8|@]|9|@$A|1K|B|1L|1|1M]]|C|$]]|$1|D|3|-4|5|6|7|1N|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|1O|8|@]|9|@$A|1P|B|1Q|1|1R]]|C|$]]|$1|H|3|-4|5|6|7|1S|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|1T|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|1U|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|1V|8|@]|9|@]|C|$]]|$1|N|3|O|5|P|7|1W|8|@]|9|@$A|1X|B|1Y|1|1Z]]|C|$]]|$1|Q|3|M|5|6|7|20|8|@]|9|@]|C|$]]|$1|R|3|S|5|6|7|21|8|@]|9|@$A|22|B|23|1|24]]|C|$]]|$1|T|3|-4|5|6|7|25|8|@]|9|@]|C|$]]|$1|U|3|V|5|G|7|26|8|@]|9|@]|C|$]]|$1|W|3|-4|5|6|7|27|8|@]|9|@]|C|$]]|$1|X|3|Y|5|6|7|28|8|@]|9|@]|C|$]]|$1|Z|3|10|5|6|7|29|8|@]|9|@$A|2A|B|2B|1|2C]]|C|$]]|$1|11|3|-4|5|6|7|2D|8|@]|9|@]|C|$]]]|12|$13|$5|14|15|16|C|$17|18]]|19|$5|14|15|16|C|$17|18]]|1A|$5|1B|15|1C|C|$1D|1E|1F|-4]]|1G|$5|14|15|16|C|$17|1H]]|1I|$5|14|15|16|C|$17|10]]]]

In iOS 15 in 2021, Apple for the first time officially supports multi-line UIButtons via the <a href="https://developer.apple.com/documentation/uikit/uibutton/configuration" rel="nofollow noreferrer">UIButton.Configuration</a> API.
<blockquote>
<h3><a href="https://developer.apple.com/documentation/uikit/uibutton/configuration" rel="nofollow noreferrer">UIButton.Configuration</a></h3>
A configuration that specifies the appearance and behavior of a button and its contents.
</blockquote>
<a href="https://i.stack.imgur.com/KW92R.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KW92R.png" alt="UIButton.Configuration" /></a>
This new API is explored in <a href="https://developer.apple.com/videos/play/wwdc2021/10059/" rel="nofollow noreferrer">What's new in UIKit</a> as well as the session:
<blockquote>
<h3>Meet the UIKit button system</h3>
Every app uses Buttons. With iOS 15, you can adopt updated styles to create gorgeous buttons that fit effortlessly into your interface. We'll explore features that make it easier to create different types of buttons, learn how to provide richer interactions, and discover how you can get great buttons when using Mac Catalyst.
<a href="https://developer.apple.com/videos/play/wwdc2021/10064/" rel="nofollow noreferrer">https://developer.apple.com/videos/play/wwdc2021/10064/</a>
</blockquote>

I have the following code...

<pre><code>UILabel *buttonLabel = [[UILabel alloc] initWithFrame:targetButton.bounds];
buttonLabel.text = @"Long text string";
[targetButton addSubview:buttonLabel];
[targetButton bringSubviewToFront:buttonLabel];
</code></pre>

...the idea being that I can have multi-line text for the button, but the text is always obscured by the backgroundImage of the UIButton. A logging call to show the subviews of the button shows that the UILabel has been added, but the text itself cannot be seen. Is this a bug in UIButton or am I doing something wrong?

How do you add multi-line text to a UIButton?

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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我有以下代码...UILabel *buttonLabel = [[UILabel alloc] initWithFrame:targetButton.bounds];buttonLabel.text = @"Long text string";[targetButton addSubview:buttonLabel]...

问如何将多行文本添加到UIButton？
EN

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问如何将多行文本添加到UIButton？EN