blocks|key|3894743|text|由于我已经创建了约束，所以答案是单击约束，然后查看实用程序栏(右边)。如下图所示，单击一项，然后确保“相对于边距”未选中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3894744|​|3894745|📷|atomic|offset|length|3894746|3894747|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/5a5306e9719356c9d9d73de87b2b983c.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]]]]

Since I had already created the constraints, the answer was to click on the constraint, and then look in the Utilities bar (on the right). As shown in the picture below, click on an item and then make sure that "relative to margin" is unchecked. 

<img src="https://i.stack.imgur.com/IS0Uj.png" alt="Relative to margin screenshot">

blocks|key|4191913|text|当您在Xcode+6中添加约束时，您有一个选项“约束到边距”，它创建了一个不同的约束，并且无法读取，例如在Xcode+5中。创建没有此选项的约束，并且警告应该消失。这个约束在iOS+8上是可用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4191914|​|4191915|📷|atomic|offset|length|4191916|4191917|如果您已经创建了约束，我们可以更改它，单击约束并编辑它。在选择第二项时，可以取消选中“相对保证金”选项(如GLee答案中所解释的)。|4191918|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/8ea2e868b7ecd797dfbdb658cf5b9cbb.png|imageAlt^0|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@$G|X|H|Y|1|Z]]|A|$]]|$1|I|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

When you add constraints in Xcode 6, you have the option "Constrain to margins" which create a different constraint and can't be read, for example, in Xcode 5.
Create the constraints without this options and the warnings should go away. This constraints will be available on iOS 8.

<img src="https://i.stack.imgur.com/I5dXj.png" alt="enter image description here">

If you have already created the constraints, we can change it clicking on the constraint and editing it. When selecting the second item, you can uncheck the "Relative to margin" option (as explained in the GLee answer.

blocks|key|4586626|text|如果您找不到警告的来源，可以使用这个grep来查找它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4586627|在项目目录中的终端中运行此命令：|4586628|grep+-C+6+-nr+Margin+.|code-block|syntax|javascript|4586629|6表示赛前和赛后要显示多少行上下文。|4586630|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you can't find where the warning is coming from you can use this grep to find it.

Run this in Terminal in your project directory:

<pre><code>grep -C 6 -nr Margin .
</code></pre>

The 6 says how many lines of context to show before and after the match.

blocks|key|4192035|text|按照Gasper的说法，将故事板作为源代码打开是非常有用的。以下是我解决这个问题的经验中的更多信息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4192036|在故事板源代码中，搜索“页边距”.You会看到这样的一行。
约束firstAttribute="trailingMargin“secondItem="Pgb-8w-IHT”secondAttribute=尾随“constant="8”nKP-uZ-7xm“/|ordered-list-item|4192037|查找其中一个属性的id+(上面示例中的PGB-8w-IHT)。|4192038|向上滚动以找到该约束属于哪个对象。类似于：
tableViewCell+contentMode="scaleToFill“selectionStyle=默认|4192039|切换回情节提要视图并显示“身份检查器”窗口。|4192040|在上面找到的对象的子视图中搜索标识检查器上的id+(Pgb-8w-IHT)。|4192041|一旦找到，检查约束以找到需要删除和重新创建的约束，而不需要选中约束到边距选项(使用constant=“作为提示”)。|4192042|4192043|4192044|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|U|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|W|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|X|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Y|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

As per Gasper Kolenc opening the storyboard as Source Code is very useful. Here is a bit more info from my experience fixing this problem:

<ol>
<li>In the storyboard source code search for "margin".You will see a line such as this.

constraint firstAttribute="trailingMargin" secondItem="Pgb-8w-IHT" secondAttribute="trailing" constant="8" id="nKP-uZ-7Xm"/</li>
<li>Find the id of one of the attributes (Pgb-8w-IHT in the example above).</li>
<li>Scroll up to find in which object this constraint belongs. Something like:

tableViewCell contentMode="scaleToFill" selectionStyle="default" </li>
<li>Switch back to storyboard view and show the identity inspector window.</li>
<li>Search through the subviews of the object you found above to find the id (Pgb-8w-IHT) on the identity inspector.</li>
<li>Once found inspect the constraints to find the one that needs to be deleted and recreated without the constrain to margins option selected (use the constant=" " as a hint". </li>
</ol>

blocks|key|4192068|text|在我的例子中，我不得不取消文件检查器中我的故事板中的“使用自动布局”，并重新执行我的应用程序中的所有约束，这是一个缩小/扩大红色矩形的旧方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4192069|Size类已经被禁用，目标是IOS+7.1。|4192070|但是，如果您有太多的视图控制器，并且已经完成了所有的约束，那么请好好考虑一下。禁用自动布局时，Xcode将清除所有自动约束并恢复到旧模型。那你必须再做一次所有的工作。|4192071|这是我处理该属性不可用警告的唯一方法。|4192072|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

In my case, I had to uncheck the "Use Auto Layout" from my storyboard in the File Inspector, and redo all the constraints in my app, the old way with that shrinking / enlarging red rectangle. 

Size Classes were already disabled and the target is IOS 7.1.

But think well if you have too many View Controllers, and had already made all your constraints. When you disable auto layout, Xcode clears all the automatic constraints and reverts to the old model. Then you have to do all the job again.

This was the only way I get rid of that Attribute Unavailable warning.

What's causing this warning in the interface builder?

Attribute Unavailable
Layout attributes relative to the layout margin on iOS versions prior to 8.0.

I'm using the XCode 6 Beta. The warnings are pointing to lines in the xml source that do not concern attributes.

Attribute Unavailable warning on iOS versions prior to 8.0

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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是什么导致了界面构建器中的警告？属性不可用的布局属性相对于8.0之前的iOS版本的布局裕度。我用的是XCode 6Beta。这些警告指向xml源中与属性无关的行。

问在8.0之前的iOS版本中的属性不可用警告
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