blocks|key|926568|text|使用下面这行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926569|myButton.contentHorizontalAlignment+=+UIControlContentHorizontalAlignmentCenter;|code-block|syntax|javascript|926570|这应该使内容居中(水平)。|926571|如果您还想将标签内的文本设置为居中，请使用：|926572|[labelOne+setTextAlignment:UITextAlignmentCenter];|offset|length|style|CODE|926573|如果您想使用IB，我这里有一个小示例，它链接在XCode+4中，但应该提供足够详细信息(还请记住，在属性屏幕的顶部显示属性选项卡。您可以在XCode+3.x中找到相同的选项卡：|926574|📷|atomic|926575|​|926576|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/fc4206ff4859143e8243eba09299152a.png|imageAlt^0|0|0|0|0|0|1E|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1A|8|@$M|1B|N|1C|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|1E|8|@]|9|@$M|1F|N|1G|1|1H]]|A|$]]|$1|V|3|W|5|6|7|1I|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|Y|$Z|$5|10|11|12|A|$13|14|15|-4]]]]

Use the line:

<pre><code>myButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
</code></pre>

This should center the content (horizontally).

And if you want to set the text inside the label to the center as well, use:

<code>[labelOne setTextAlignment:UITextAlignmentCenter];</code>

If you want to use IB, I've got a small example here which is linked in XCode 4 but should provide enough detail (also mind, on top of that properties screen it shows the property tab. You can find the same tabs in XCode 3.x):
<img src="https://i.stack.imgur.com/1igTb.png" alt="enter image description here">

blocks|key|926618|text|对于UIButton，您应该使用：-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926619|​|926620|[btn+setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];|code-block|syntax|javascript|926621|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|$]]

For UIButton you should use:-

<pre><code>[btn setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];
</code></pre>

blocks|key|926854|text|适用于ios+8和Swift|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926855|btn.titleLabel.textAlignment+=+NSTextAlignment.Center|offset|length|style|CODE|926856|或|926857|btn.titleLabel.textAlignment+=+.Center|926858|entityMap^0|0|0|1H|0|0|0|12|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

For ios 8 and Swift

<code>btn.titleLabel.textAlignment = NSTextAlignment.Center
</code>

or

<code>btn.titleLabel.textAlignment = .Center
</code>

blocks|key|710476|text|对于正在使用iOS+6或更高版本的用户，UITextAlignmentCenter已被弃用。现在是NSTextAlignmentCenter|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710477|例如：mylabel.textAlignment+=+NSTextAlignmentCenter;可以完美地工作。|offset|length|style|CODE|710478|entityMap^0|0|3|1A|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

For those of you who are now using iOS 6 or higher, UITextAlignmentCenter has been deprecated. It is now NSTextAlignmentCenter

EXAMPLE: <code>mylabel.textAlignment = NSTextAlignmentCenter;</code> Works perfectly.

blocks|key|710660|text|假设btn引用UIButton，要将多行标题更改为水平居中，您可以在iOS+6或更高版本中使用以下语句：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710661|self.btn.titleLabel.textAlignment+=+NSTextAlignmentCenter;|code-block|syntax|javascript|710662|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|$]]

Assuming that btn refers to a UIButton, to change a multi-line caption to be centered horizontally, you can use the following statement in iOS 6 or later:

<pre><code>self.btn.titleLabel.textAlignment = NSTextAlignmentCenter;
</code></pre>

blocks|key|710893|text|对于Swift+4：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710894|@IBAction+func+myButton(sender:+AnyObject)+{
++++sender.titleLabel?.textAlignment+=+NSTextAlignment.center
++++sender.setTitle("Some+centered+String",+for:UIControlState.normal)
}|code-block|syntax|javascript|710895|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|$]]

For Swift 4:
<pre><code>@IBAction func myButton(sender: AnyObject) {
 sender.titleLabel?.textAlignment = NSTextAlignment.center
 sender.setTitle(&quot;Some centered String&quot;, for:UIControlState.normal)
}
</code></pre>

blocks|key|926753|text|iOS6中不推荐使用UITextAlignmentCenter|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|926754|相反，您可以使用以下代码：|926755|btn.titleLabel.textAlignment=NSTextAlinmentCenter;|926756|entityMap^0|A|L|0|0|0|1E|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

<code>UITextAlignmentCenter</code> is deprecated in iOS6

Instead you can use this code:

<code>btn.titleLabel.textAlignment=NSTextAlinmentCenter;</code>

blocks|key|926985|text|适用于Swift+3.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926986|btn.titleLabel?.textAlignment+=+.center|code-block|syntax|javascript|926987|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|$]]

For Swift 3.0

<pre><code>btn.titleLabel?.textAlignment = .center
</code></pre>

blocks|key|926964|text|试着这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926965|yourButton.contentVerticalAlignment+=+UIControlContentVerticalAlignmentCenter;
yourButton.contentHorizontalAlignment+=+UIControlContentHorizontalAlignmentCenter;|code-block|syntax|javascript|926966|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 Like this : 

<pre><code>yourButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
yourButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
</code></pre>

blocks|key|927079|text|你可以在故事板中做到这一点。选择您的按钮。设置换行符“Word+Wrap”，将标题“Plain”设置为“Attributed”。选择“居中对齐”。此部分是重要的=>单击...(更多)按钮。并将换行模式选择为“字符换行”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|927080|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|$]]

You can do this from storyboard.
Select your button. Set Line Break 'Word Wrap', Set your title 'Plain' to 'Attributed'. 
Select 'Center alignment'. This part is important => Click ...(More) Button. And select line breaking mode to 'Character Wrap'.

blocks|key|710763|text|UIButton不支持setTextAlignment。因此您需要使用setContentHorizontalAlignment来实现按钮文本对齐|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710764|供您参考|710765|[buttonName+setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];|code-block|syntax|javascript|710766|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|$]]

UIButton will not support setTextAlignment. So You need to go with setContentHorizontalAlignment for button text alignment 

For your reference 

<pre><code>[buttonName setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];
</code></pre>

I can't set the title of UIButton using IB as center. My title is multi line. It is giving like this one <img src="https://i.stack.imgur.com/fbyTL.png" alt="enter image description here">

But I want like this one <img src="https://i.stack.imgur.com/iSmeP.png" alt="enter image description here">

I have given space in this but I don't want to do that. As it is not aligned exactly for some cases and I know there is a property of UILabel to set the alignment but I don't want to write a code for that.. just want to set everything from IB.

Thanks

How to make UIButton's text alignment center? Using IB

以IB为中心不能设置UIButton的标题。我的标题是多行。它是像这样给予的​但是我想要像这样的​我已经在这方面给出了空间，但我不想那样做。因为它在某些情况下并不是完全对齐的，我知道UILabel有一个属性可以设置对齐，但我不想为此编写代码。只想从IB设置所有内容。谢谢

问如何使UIButton的文本居中对齐？使用IB
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