blocks|key|1193318|text|这与Interface+Builder没有任何关系，这里发生的是Xcode没有从你的静态库中加载符号。要解决此问题，您需要将-all_load+-ObjC标志添加到Other+Linker+Flags键、项目(可能还有目标)构建设置中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1193319|由于Objective-C只为每个类生成一个符号，因此我们必须通过使用-ObjC标志来强制链接器加载类的成员，还必须通过添加-all_load链接器标志来强制包含静态库中的所有对象。如果您跳过这些标志，迟早会遇到unrecognized+selector的错误，或者得到其他异常，比如您在这里观察到的异常。|1193320|entityMap^0|1Q|F|2A|I|0|1Q|9|2Y|L|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|I|$]]

This doesn't really have anything to do with Interface Builder, what's happening here is the symbols aren't being loaded from your static library by Xcode. To resolve this problem you need to add the <code>-all_load -ObjC</code> flags to the <code>Other Linker Flags</code> key the Project (and possibly the Target) Build Settings. 

Since Objective-C only generates one symbol per class we must force the linker to load the members of the class too by using the -ObjC flag, and we must also force inclusion of all our objects from our static library by adding the <code>-all_load</code> linker flag. If you skip these flags sooner or later you will run into the error of <code>unrecognized selector</code> or get other exceptions such as the one you've observed here.

blocks|key|1194964|text|我今天在使用Swift的时候确实遇到了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194965|我将类Model.h+%2B+Model.m更改为Model.swift。此对象在接口生成器中与class+=+Model一起使用。|offset|length|style|CODE|1194966|一旦我替换了对象，这个类就不能再被加载了。|1194967|我要做的是将IB中的类引用从：|1194968|Class+=+Model
Module+=+|code-block|syntax|javascript|1194969|至|1194970|Class+=+Model
Module+=+<TARGETNAME>|1194971|您可以在构建设置中找到<TARGETNAME>。它也是在生成的Swift-Header中显示的名称：#import+"TARGETNAME-Swift.h"|1194972|entityMap^0|0|3|H|N|B|1A|D|0|0|0|0|0|0|B|C|1E|S|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]|$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|18|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|1A|8|@]|9|@]|A|$O|P]]|$1|U|3|V|5|6|7|1B|8|@$D|1C|E|1D|F|G]|$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|X|$]]

I did run into this problem today using Swift.

I changed a class <code>Model.h + Model.m</code> to a <code>Model.swift</code>. 
This object was used in Interface Builder with the <code>class = Model</code>. 

As soon as I replaced the object the class could no longer be loaded.

What I had to do was to change the class reference in IB from:

<pre><code>Class = Model
Module = 
</code></pre>

to 

<pre><code>Class = Model
Module = &lt;TARGETNAME&gt;
</code></pre>

You'll find the <code>&lt;TARGETNAME&gt;</code> in the build settings. It is also the name that shows up in your generated Swift-Header: <code>#import "TARGETNAME-Swift.h"</code>

blocks|key|1409222|text|去"ProjectName“，点击它，然后去”构建阶段“标签，然后点击”编译源代码“，然后点击"%2B”按钮，一个窗口就会出现，选择"MyClass.m“文件，然后点击”添加“，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409223|构建并运行项目，问题一定会得到解决|1409224|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|$]]

Go to the "ProjectName" , click on it , and then go the "Build phases" tab , and then click on the "compile sources" , and then click on "+" button , a window will appear , the choose "MyClass.m" file and then click "add" ,

Build the Project and Run it , the problem will surely get solved out

blocks|key|1408557|text|这是Xcode4缓存问题，只需删除/Users/your_user/Library/Application+Support/iPhone+Simulator/4.3/Applications/下的所有文件夹|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1408558|另外，如果你在你的iPhone上有同样的问题，在运行之前删除旧的应用程序...|1408559|祝好运。帕斯夸尔|1408560|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|$]]

It's a Xcode4 cache problem, just delete all folders under
/Users/your_user/Library/Application Support/iPhone Simulator/4.3/Applications/

Also if you have the same issue testing on your iPhone, delete the old app before running it...

Good luck. Pascual

blocks|key|1410511|text|我的案例-在我的objective+c项目中尝试使用来自swift框架的类时，我得到了这个错误。解决方案是在Interface+builder/+Storyboard中添加类的Module+(swift框架)，如下所示。没别的了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410512|​|1410513|📷|atomic|offset|length|1410514|1410515|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/dc5733aa080055e53ef54dee2c82ad5c.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]]]]

My case - Trying to use a Class from a swift framework in my objective c project, I got this error. Solution was to add Module (swift framework) of the class in Interface builder/ Storyboard as shown below. Nothing else

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

blocks|key|1409104|text|转到构建阶段->编译源文件并添加新的.m文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409105|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|$]]

Go to Build Phases-> Compile Sources and add your new .m files.

blocks|key|1194501|text|在我的例子中，它显示了一个甚至不存在的类的错误！我怀疑这是故事板文件中被引用的东西。如果您不能识别错误中的类文件，请尝试执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194502|1)在sublime或其他好的编辑器中打开您的项目。搜索被引用的类。2)去掉上面写着|1194503|customClass="UnrecognizedClassName"|code-block|syntax|javascript|1194504|3)保存。4)返回xcode，清理项目，现在尝试运行。|1194505|对我很管用。|1194506|​|1194507|📷|atomic|offset|length|1194508|1194509|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/4823e4f7f7fdf53947e39fefc8efd7ad.png|imageAlt^0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|15|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|18|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|19|8|@]|9|@$R|1A|S|1B|1|1C]]|A|$]]|$1|T|3|N|5|6|7|1D|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11|12|-4]]]]

In my case it was showing an error for a class that didn't even exist! I suspected it was something that got borked in the storyboard file. If you don't recognize the class file in the error try this:

1) open your project in sublime or another good editor. Search for the class being referred to.
2) remove the whole bit that says

<pre><code>customClass="UnrecognizedClassName"
</code></pre>

3) save it. 
4) return to xcode and clean the project, and try running it now. 

worked for me.

<img src="https://i.stack.imgur.com/E9CPq.png" alt="enter image description here">

blocks|key|1193168|text|我通过从class.h和.m中复制文本，从项目中删除这些类文件，并使用"Add+File“创建具有相同名称的新class.h和.m文件来修复此问题。然后我将代码重新粘贴到新文件中，一切都运行得很好。不知何故，这些文件在创建时没有正确链接。在那之后，我不需要使用任何链接器标志。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1193169|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|$]]

I fixed this by copying the text from my class.h and .m, deleting those class files from the project, and creating new class.h and .m files with the same name using "Add File". Then I pasted the code back into the new files, and everything worked great. Somehow the files weren't linked correctly when they were created. I didn't need to use any linker flags after that.

blocks|key|1193789|text|我最终解决了这个问题，我忘了在我的.m文件中添加以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1193790|@implementation+MyTableViewCell

@end|code-block|syntax|javascript|1193791|这是因为我为表格单元格创建了一个占位符@接口，该接口连接到.xib文件中的一个元素，但接口构建器中存在一个错误，如果没有为类指定@实现，则无法找到它。|1193792|我已经完成了其他论坛中查看.xib源代码和查看MyTableViewCell的所有步骤，即使我在代码中注释掉了它。我试着重置模拟器。我甚至尝试将我的所有类拆分成与接口名称相同的单独文件，但在此之前什么都不起作用。|1193793|附注:根据我的经验，.h/.m文件的名称是否与@接口的名称不同并不重要。我有几个包含多个@接口的文件，它们工作得很好。|1193794|另外，我有一个更详细的解释，解释为什么UITableViewCell和UICollectionViewCell会在https://stackoverflow.com/a/22797318/539149中导致这个错误，以及如何在编译时使用registerClass:+forCellWithReuseIdentifier:来显示它。|offset|length|1193795|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/22797318/539149^0|0|0|0|0|0|1L|17|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

I FINALLY fixed this, I had forgotten to add the following code to my .m file:

<pre><code>@implementation MyTableViewCell

@end
</code></pre>

So it was being caused because I had made a placeholder @interface for my table cell, that had a connection to an element in the .xib file, but there is a bug in Interface Builder where if no @implementation is specified for a class, it can't find it.

I had gone through all of the steps from other forums of viewing the .xib as source and seeing MyTableViewCell even though I had commented it out of my code. I had tried resetting the simulator. I even tried breaking all of my classes up into separate files named the same as the interfaces, but nothing worked until this.

P.S. in my experience, it doesn't matter if the names of the .h/.m files are different from the names of the @interface. I have several files containing more than one @interface and they work fine.

P.P.S. I have a more detailed explanation of why UITableViewCell and UICollectionViewCell cause this error at <a href="https://stackoverflow.com/a/22797318/539149">https://stackoverflow.com/a/22797318/539149</a> along with how to reveal it at compile-time using registerClass: forCellWithReuseIdentifier:.

blocks|key|1408368|text|不仅在项目设置中，而且在目标设置中，您还必须添加-all_load+-ObjC标志。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1408369|Core-Plot:+Unknown+class+CPLayerHostingView+in+Interface+Builder+file|offset|length|1408370|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2431187/core-plot-unknown-class-cplayerhostingview-in-interface-builder-file/3012320#3012320^0|0|0|1X|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Not only in project settings, but in Target setting also u have to add -all_load -ObjC flags..

<a href="https://stackoverflow.com/questions/2431187/core-plot-unknown-class-cplayerhostingview-in-interface-builder-file/3012320#3012320">Core-Plot: Unknown class CPLayerHostingView in Interface Builder file</a>

blocks|key|1193435|text|只需删除MyClass.m和.h，并将它们添加到项目中，这对我来说是可行的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1193436|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|$]]

Just remove the MyClass.m and .h and add them to project again is work for me.

blocks|key|1409031|text|我有‘界面生成器文件中的未知类类’，并将其追踪到一个故事书场景中，在身份检查器顶部的favouritesButton字段中，有问题的按钮有一个虚假的自定义类"favouritesButton“。我的意思是将该值放入下一个字段:身份标签。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409032|将其更改为"UIButton“解决了问题。|1409033|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|$]]

I had 'Unknown class favouritesButton in Interface Builder file' and tracked it down to a storybook scene where the button in question had a bogus custom class of "favouritesButton" in the Class field at the top of the Identity Inspector. I meant to put that value in the next field: Identity Label. 

Changing this to "UIButton" solved the problem.

blocks|key|1410091|text|我在Swift遇到了这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410092|将.xib文件移动到项目的Base.lproj文件夹中可以消除此错误。|1410093|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|$]]

I ran into this in Swift.

Moving the .xib file into the project's Base.lproj folder got rid of this error.

blocks|key|1408704|text|今天，当我在Xcode4下将我的aaLuminate应用程序转换为通用应用程序时，突然出现了这个错误。这个应用程序基于实用程序模板，最初是在Xcode3下构建的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1408705|为了节省时间，我将iPhone的主视图和侧视图复制到通用应用程序上的适当名称。我遇到了“接口生成器文件中存在未知的类x”错误。在我的例子中，它在XIB文件或目标中是空的。|1408706|出于其他原因，我还复制了aaLuminate-Info.plist文件-它有一个旧密钥"Main+nib+file+base+name“设置为MainWindow。|1408707|一旦我删除了这个键，它就解决了这个问题！|1408708|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|$]]

I had this error crop up today when converting my aaLuminate app to Universal under Xcode 4. 
This app is based on the utility template and was originally built under Xcode 3. 

To save time I copied the iPhone Main and Flipside Views across to appropriate names on the Universal app. I experienced the "Unknown class x in Interface Builder file" error. In my case it was nothing in the XIB files or targets.

I had also copied the aaLuminate-Info.plist file across for other reasons - this had an old key "Main nib file base name" set to MainWindow.

As soon as I deleted this key it fixed the problem!

blocks|key|1408832|text|在我的例子中，我得到这个错误是因为我试图通过创建一个新项目，然后删除几个源文件，并从正在工作的项目复制同名的源文件来保存一些工作。我还复制了查找RootViewController的MainStoryBoard文件。然而，当我从上一个产品中删除了原始的RootViewController，然后添加到RootViewController中时，很明显，Add+Files操作未能按照上面的建议“选中”目标框。只需查看所有newley导入的".m“文件，并确保选中了目标成员资格框，就一切正常。我认为发生的事情是故事板文件正在寻找一个被“排除”在链接之外的类，因为目标成员资格没有被选中。确保在文件检查器中的目标成员中指定了目标所需的文件。谢谢，帕特！(见上)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1408833|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|$]]

In my case I got this error because I'd tried to save some work by creating a new project and then deleting several of the source files and copying over the source files of the same name from the working project. I also copied my MainStoryBoard file which was looking for my RootViewController. However, when I had deleted the original RootViewController and then added in the RootViewController from the previous product, evidently the Add Files operation failed to "check" the target box as suggested above. By merely visting all of the newley imported ".m" files and making sure that the target membership box was checked, all was well. I think what was happening was that the storyboard file was looking for a class that had been "excluded" from the link because the target membership was unchecked. Making sure the required files for the target are so designated in the target membership in the file inspector did the trick. Thanks Pat! (see above)

blocks|key|1193545|text|在我的例子中，这是因为我在.h文件中声明了UITableView单元格的子类的一个子类(两个子类的声明都在同一个.h文件中)，但是忘记了在.m文件中为第二个子类创建一个空实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1193546|不要忘记实现您在.h文件中声明的子类的任何子类！听起来很简单，但很容易忘记，因为如果您使用的是每个.h/.m文件的一个类，那么Xcode将为您做这件事。|1193547|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 my case it was because I declared a subclass of a subclass of a UITableView cell in the .h file (the declaration of both subclasses were in the same .h file), but forgot to make an empty implementation of that second subclass in the .m file.

don't forget to implement any subclass of a subclass you declare in the .h file! sounds simple, but easy to forget because Xcode will do this for you if you are working with one class per .h/.m file.

blocks|key|1194092|text|我有“接口生成器中的未知类RateView”，其中RateView是UIView的子类。我将一个自定义类放到了我的故事板场景中，并将UIView类字段更改为RateView。尽管如此，这个错误还是出现了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194093|为了进行调试，我将类的名称更改为RateView2，并将除UIView的Custom+class字段之外的所有引用都更改为匹配。错误消息仍然像以前一样出现，其中RateView是缺少的类。这确认了错误消息与Custom+class字段的值有关。我将此值更改为RateView2，错误消息更改为"Unknown+class+RateView2+in+Interface+Builder“。各种各样的进步。|1194094|最后，我在文件检查器中检查了源代码文件本身。在那里，我发现源代码文件(我从教程中复制的)与我的Target没有关联。换句话说，它没有Target成员资格。我选中了使类的源代码文件成为目标应用程序成员的复选框，错误消息消失了。|1194095|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|$]]

I had "Unknown class RateView in Interface Builder" where RateView was a subclass of UIView. I had dropped a UIView onto my Storyboard scene and changed the Custom class field to RateView. Still, this error appeared.

To debug, I changed the name of my class to RateView2 and changed all references to match except the Custom class field of the UIView. The error message still appeared as before with RateView as the missing class. This confirmed that the error message was related to the value of the Custom class field. I changed this value to RateView2 and the error message changed to "Unknown class RateView2 in Interface Builder". Progress of sorts.

Finally, I inspected the source code files themselves in the File Inspector. There I discovered that the source code file (which I had copied from a tutorial) was not associated with my Target. In other words, it had no Target Membership. I checked the box that made the class's source code file a member of the target app and the error message went away.

blocks|key|1409568|text|在我的例子中，我删除了一个名为"viewController“的类，没有意识到它是用故事板的身份检查器选中的(在顶部的”自定义类“下)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409569|您只需在identity检查器的Custom+Class字段中为视图控制器选择正确的类，或者向项目中添加一个新类并选择该类作为Custom+class。|1409570|对我很管用！|1409571|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|$]]

In my case I had deleted a class called "viewController" not realising it was selected with the storyboard's identity inspector (under 'Custom Class' up the top).

You just have to simply select the correct class for the view controller in your identity inspector's Custom Class field or add a new class to your project and select that one as your Custom Class.

Worked for me!

blocks|key|1194235|text|我在目标中的构建阶段下添加了文件，问题得到了解决。有关添加文件的步骤，请参阅我的答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194236|Apple+Mach-O+Linker+error+(APActivityIcon)|offset|length|1194237|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/13239684/apple-mach-o-linker-error-apactivityicon/15791455#15791455^0|0|0|16|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I added the file Under Build Phase in Targets and the issue got resolved. For the steps to add the file, see my answer at:

<a href="https://stackoverflow.com/questions/13239684/apple-mach-o-linker-error-apactivityicon/15791455#15791455">Apple Mach-O Linker error (APActivityIcon)</a>

blocks|key|1409809|text|这让我有点抓狂，上面的建议都没有帮助我摆脱这个错误。幸运的是，我只有一个IB对象在使用这个类，所以我删除了它，然后用指定的同一个类重新添加了它。错误消失...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409810|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|$]]

This drove me nuts for a bit and none of the suggestions above helped me get rid of the error. Luckily I only had one IB object using the class so I just deleted it and added it back with the same class specified. Error went away...

blocks|key|1193354|text|我尝试了你们上面推荐的大多数解决方案，但都没有效果。在阅读了user776904的解决方案后，我怀疑我遇到了与从头重新构建应用程序相同的问题，但我复制了前一个项目的xib文件。我怀疑xib文件引用了导致我出错的旧项目，所以我简单地删除了我的mainwindow_ipad.xib文件，并从一个干净的新项目中复制了一个新文件。这就解决了这个问题。而且我还没有开始修改xib文件源代码中的一小部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1193355|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|$]]

I tried most of the solutions you guys suggested above but to no avail. After reading the solution from user776904's I suspected I was having the same issue as I had rebuilt my app from the ground up but copied the xib files from the previous project. I suspected the xib file had a reference to the old project that was causing my error so I simply deleted my mainwindow_ipad.xib file and copied in a new one from a clean new project. This solved it. And I was not game enough to start changing bits of the xib file in its source code.

blocks|key|1193891|text|从接口构建器/故事板引用到一个不可用的类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1193892|如果是已知的类，则不会进行链接。|1193893|如果不是一个类，或者只是一些字符，它可能是一个打字错误。在这种情况下，检查视图控制器中这个“未知类”的所有字段。在'Identity+Inspector‘中(在块'Custom+Class’中从左起第三个)是一个字段'Class‘，它可能包含错误的值。通常它会列出字段类型(UIView+/+UILabel等)。|1193894|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|$]]

From interface builder/storyboard is referred to a class that is not available.

If the is a known class it is not linked.

If the is not a class or just some characters it is probably a typo.
In that case check all the fields in the view controller for this 'unknown class'. 
In the 'Identity Inspector' (3rd from left in the block 'Custom Class' is one field
'Class' which probably contains the wrong value. Normally it lists the field type
(UIView / UILabel etc).

blocks|key|1409323|text|尽管更新了所有相关的.h和.m，但我在更改类名时看到了这个错误。结果，我错过了更新.storyboard文件中的'customClass‘值。这就解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409324|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|$]]

I saw this error when I changed a class name, despite updating all relevant .h and .m. Turned out, I had missed updating 'customClass' value in the .storyboard files. That resolved the problem.

blocks|key|1194301|text|这里有很多答案，但没有一个是解决方案，我追踪到控制器具有无效自定义类的storyBoard+(类在我重命名后不存在)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194302|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|$]]

A lot of answers here but none was the solution, 
I tracked it down to the storyBoard where the controller had an Invalid custom class (class does not exist after I renamed it)

blocks|key|1194340|text|当我创建了一个具有相同名称的新项目并在模拟器中运行它们时，我遇到了这个问题。我重命名了其中一个项目，删除了模拟器中的应用程序，然后运行了一个干净的重新构建。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194341|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|$]]

I had this issue when I had made a new project with the same name and had run them both in the simulator. I renamed one of the projects, deleted the app in the simulator, then ran a clean and re-build.

blocks|key|1194593|text|在我的例子中，我收到这个错误消息是因为我犯了一个非常愚蠢的错误:在接口构建器上，我想设置UITableViewCell的标识符，但我不小心在接口构建器的“自定义类”条目中键入了标识符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194594|我之前做了1000次细胞....|1194595|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 my case I get this error message by a very stupid mistake by me: on interface builder I wanted to set the identifier of a UITableViewCell, but I typed the identifier accidentally to the 'Custom class' entry in interface builder. 

I made cells 1000 times before....

blocks|key|1410043|text|如果您有多个StoryBoard和一个使用并不实际存在的StoryBoard，则会在运行时出现此“接口生成器文件中的未知类”错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410044|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|$]]

This “Unknown class in Interface Builder file” error at runtime come if you have more then one StoryBoard and one of the StoryBoard using the which is not really exists.

blocks|key|1410071|text|在我的例子中是一个拼写错误的"Custom+Class“名称。确保检查您定义的自定义类的故事板。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410072|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|$]]

In my case was a misspelling "Custom Class" name. Make sure that you check your storyboard for the custom classes that you defined.

blocks|key|1410159|text|在我的例子中，我使用了另一个项目的故事板。在查看了序列图像板文件xml+(例如，在TextWrangler中)之后，我注意到控制器的一个"customModule“xml属性值是错误的(它仍然引用旧项目)。手动更改此设置解决了此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410160|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|$]]

In my case I had used a storyboard from another project. After looking at the storyboard file xml (e.g. in TextWrangler) I noticed that one of the "customModule" xml attribute values for a controller was wrong (it was still referencing the old project). Manually changing this fixed the problem.

blocks|key|1410202|text|在我的例子中，定制的UIView类在一个嵌入式框架中。我将自定义项目头文件更改为“UIView”，并将其包含在主头文件中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410203|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|$]]

In my case, the custom UIView class is in an embedded framework. I changed the custom UIView header file to "project" to "public" and include it in the master header file.

blocks|key|1410236|text|我一次又一次地在使用WatchKit时遇到这个错误，似乎是因为在代码中有一个用户界面元素没有绑定到插座。我猜这在WatchKit中是必需的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410237|class+InterfaceController:+WKInterfaceController+{
++++@IBOutlet+weak+var+table:+WKInterfaceTable!
}|code-block|syntax|javascript|1410238|重要提示:只要连接最外层的元素即可。例如，如果您还试图为表中的某些内容提供连接，例如一行中的标签，您将得到一个编译器错误，指出outlet无效，并且无法连接到重复内容。|1410239|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|$]]

I keep having this error with WatchKit over and over again and it seems to be when there is a user interface element that isn't tied to an outlet in code. I guess this is required in WatchKit.

<pre><code>class InterfaceController: WKInterfaceController {
 @IBOutlet weak var table: WKInterfaceTable!
}
</code></pre>

Important note: just connect the outermost element. For instance if you try to also give a connection for something within the table like a label inside a row you will get a compiler error saying the outlet is invalid and cannot be connected to repeating content.

blocks|key|1195023|text|在我的例子中，问题是一个死的IBOutlet链接。一旦解决了这个问题，一切都恢复正常了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1195024|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|$]]

In my case problem was a dead IBOutlet link. Once this was fixed everything was good again.

blocks|key|1410562|text|在尝试了这里的大多数建议都没有成功之后，我只是重命名了我的类，然后在xib文件中手动重命名(以open作为源代码)。然后问题就消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410563|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|$]]

After trying most of the suggestions here wihtout success, I just renamed my class and then renamed it manually in the xib file (with open as source code). Problem then went away.

blocks|key|1410598|text|在我的例子中，找不到这个类，因为它是在框架内的扩展中定义的一个类，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410599|extension+Buttons+{
++++public+class+MyButton:+UIButton+{
++++++++//+...
++++}
}|code-block|syntax|javascript|1410600|当我从扩展中提取类时，故事板最终可以找到类(MyFrameworkButton)：|1410601|extension+Buttons+{
++++public+typealias+MyButton+=+MyFrameworkButton
}

public+class+MyFrameworkButton:+UIButton+{
++++//+...
}|1410602|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|$]]

In my case, the class couldn't be found because it was a classed defined in an extension inside the framework like so:

<pre><code>extension Buttons {
 public class MyButton: UIButton {
 // ...
 }
}
</code></pre>

When I extracted the class from the extension, the Storyboard could finally find the class (MyFrameworkButton): 

<pre><code>extension Buttons {
 public typealias MyButton = MyFrameworkButton
}

public class MyFrameworkButton: UIButton {
 // ...
}
</code></pre>

Even though Interface Builder is aware of a <code>MyClass</code>, I get an error when starting the application.

This happens when <code>MyClass</code> is part of a library, and does not happen if I compile the class directly in the application target.

"Unknown class <MyClass> in Interface Builder file" error at runtime

Objective-C

编译器

Swift

Xcode

即使接口生成器知道MyClass，我在启动应用程序时也会得到一个错误。当MyClass是库的一部分时，就会发生这种情况，如果我直接在应用程序目标中编译类，就不会发生这种情况。

问运行时出现“接口生成器文件中的未知类<MyClass>”错误
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