blocks|key|4546887|text|最简单的解决方案是在-viewDidAppear:中运行该代码(在运行自动布局之后)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4546888|entityMap^0|A|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

The simplest solution is to just run that code in <code>-viewDidAppear:</code> (after autolayout has been run).

blocks|key|4546907|text|最佳时刻是在viewDidLayoutSubviews期间，因为它发生在viewDidAppear之前，所以您仍然可以在视图显示之前进行一些修改。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4546908|entityMap^0|6|L|10|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

The best moment is during the <code>viewDidLayoutSubviews</code> because it happens before the <code>viewDidAppear</code>so you still are able to do some modifications before the view is displayed.

blocks|key|40069|text|您可以只使用UIView方法intrinsicContentSize|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|40070|​|40071|📷|atomic|40072|40073|你可以读到关于https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/intrinsicContentSize的|40074|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2b630e7039a673bf656ff4f53714aac4.png|imageAlt|1|LINK|MUTABLE|url|https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/intrinsicContentSize^0|6|6|E|K|0|0|0|1|0|0|0|7|3P|1|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|K|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|N|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]|W|$5|X|R|Y|E|$Z|10]]]]

You could just use the <code>UIView</code> method <code>intrinsicContentSize</code>

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

which you can read about <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/intrinsicContentSize" rel="noreferrer">https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/intrinsicContentSize</a>

blocks|key|40098|text|在“获取实际大小代码”之前，插入以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|40099|[view+setNeedsLayout];
[view+layoutIfNeeded];|code-block|syntax|javascript|40100|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|$]]

Before your "getting real size code", insert the following code:

<pre><code>[view setNeedsLayout];
[view layoutIfNeeded];
</code></pre>

blocks|key|4547001|text|由于每个人都假设访问是通过UIViewController完成的，而不是在UIView子类中完成的，所以答案并不是真正有用的。获取UIView子类的正确大小的正确方法是在layoutSubviews中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4547002|entityMap^0|D|G|11|6|1T|6|2D|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

Since everybody assumes the access is done via a <code>UIViewController</code> and not inside a <code>UIView</code> subclass, the answers don't prove really useful. The correct way to get the correct size of a <code>UIView</code> subclass is in <code>layoutSubviews</code>.

blocks|key|40154|text|view+layoutIfNeed保存我。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|40155|使用此方法可在绘制前强制进行子视图布局。此方法使用接收消息的视图作为根视图，从根开始布局视图子树。|40156|调用此方法后，我可以在xib中获得自定义视图的实际大小。非常感谢@Allen和作者。|40157|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|$]]

[view layoutIfNeed] save me.

Use this method to force the layout of subviews before drawing. Using the view that receives the message as the root view, this method lays out the view subtree starting at the root.

After invoke this method, I can get actual size of custom view in xib.
Thanks a lot to @Allen and the author.

blocks|key|40216|text|这太棒了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|40217|如果你想在使用autolayout时不使用layoutsubviews方法来获取帧，可以使用这个方法：|40218|dispatch_async(dispatch_get_main_queue(),+%5E{
++++++++NSLog(@"View+frame:+%25@",+NSStringFromCGRect(view.frame));
++++})|code-block|syntax|javascript|40219|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|$]]

This is awesome.

If you want to get frame without using layoutsubviews method during autolayout usage, Use this one:

<pre><code>dispatch_async(dispatch_get_main_queue(), ^{
 NSLog(@"View frame: %@", NSStringFromCGRect(view.frame));
 })
</code></pre>

I'm a new developer iOS.

I use auto-layout.

I have a problem. I can not get real size of UIView after constraints.

Example, when I want get size of <code>UIView</code> with constraint

<pre><code>self.container.frame.size.height
</code></pre>

It alway return 550 for all device size. But I can see it have difference size when I run it on difference device.

Thanks

How to get real size UIView with autolayout

我是一个新的开发者iOS。我使用自动布局。我有个问题。在约束之后，我不能得到UIView的实际大小。例如，当我想要获取带约束的UIView的大小时self.container.frame.size.height对于所有设备大小，它总是返回550。但是当我在不同的设备上运行它时，我可以看到它有不同的大小。谢谢

问如何使用自动布局获得实际大小的UIView
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