blocks|key|1734518|text|您将收到错误，因为没有名为loginButton的属性。检查您的.xib文件。几乎可以肯定的是，指定loginButton的FinalViewWithSending对象(很可能是文件的所有者)的链接是错误的，即使它不存在于类代码中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1734519|entityMap^0|6|3|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|$]]

You are getting the error because there is no property called loginButton. Check your .xib file. There is almost certainly a bad link to a FinalViewWithSending object (likely File's Owner) that specifies loginButton even though it doesn't exist in the class code.

blocks|key|4345314|text|菲利普·米尔斯是对的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4345315|在这里，对于任何搜索的人来说，答案是编辑故事板并删除任何指向指定的未定义键的链接。你必须在外部编辑器中编辑序列图像板文件:右键单击层次结构中的序列图像板列表，然后单击“在查找器中显示”或其他选项。在文本编辑器中打开，通过搜索删除所述链接，保存并返回到Xcode。没有更多的问题。|4345316|当您不正确地从视图控制器中删除某些内容时，就会发生这种情况。|4345317|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|$]]

Phillip Mills is correct.

The answer here, for anyone searching, is to edit the storyboard and remove any link to the undefined key specified. You have to edit the storyboard file in an external editor: Right click on the storyboard listing in the hierarchy and then click on "show in finder" or what have you. Open in a text editor, remove said links by searching, save and return to Xcode. No more issue.

This happens when you remove something from the view controller improperly.

blocks|key|2233210|text|同意这一点-菲利普·米尔斯是正确的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2233211|有人提到在文本编辑器中打开故事板--这是不必要的。|2233212|只需单击情节提要，转到Connections+Inspector。如果你有一个有问题的插座，你会在插座旁边看到一个感叹号。把它删掉。|2233213|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|$]]

Agreeing here - Phillip Mills is correct.

Someone mentioned opening the storyboard up in a text editor - this isn't necessary.

Just click on the storyboard, go to the Connections Inspector. If you've got a problematic outlet, you'll see an exclamation marker next to the outlet. Delete it.

blocks|key|2233408|text|因为这是这个错误的第一个搜索结果，所以我决定为像我这样的菜鸟写一个答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2233409|如果你使用Ctrl键从按钮拖动连接，这会在你的ViewController中生成代码，然后你只删除代码而不删除连接，那么你就会得到这个错误。|2233410|我得到这个错误是因为我意外地添加了几个按钮作为插座，而我想将它们添加为动作。我删除了生成的代码，但错误的连接仍然存在。|2233411|要查找并移除它们，请查看->实用工具->显示连接检查器|2233412|然后单击您拥有的不同按钮，并单击x以删除不良连接。|2233413|​|2233414|📷|atomic|offset|length|2233415|2233416|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/291cfce2152a63a9086abac5dfe7b41f.png|imageAlt^0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|16|8|@]|9|@$O|17|P|18|1|19]]|A|$]]|$1|Q|3|K|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

Since this is the first search result for this error, I decided to write an answer for rookies like me. 

You are going to get this error if you have Ctrl dragged connections from Buttons which generates code in your ViewController and then you delete just the code without removing the connection. 

I got this error because I had accidently added a few buttons as Outlets, when I wanted to add them as Actions. I deleted the code that got generated but the bad connections were still there. 

To find and remove them, View->Utilities->Show Connections Inspector

Then click through the different buttons you have and click the x to remove the bad connections. 

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

blocks|key|5762386|text|如果您有任何本地化，请在所有故事板中搜索错误链接(展开故事板以查找本地化的故事板)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5762387|这就是我的处境。我正在寻找一个故事板中的坏链接，它们在本地化的那个中。|5762388|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|$]]

If you have any localizations, search for bad links in all the storyboards (expand storyboard to find localized storyboards).

This was my situation. I was looking for bad links in one storyboard and they were in the localized one.

blocks|key|4345542|text|您可以尝试我用来解决setValue:forUndefinedKey:]:问题的方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4345543|​|4345544|📷|atomic|4345545|4345546|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/7e511d33cad1b748342fe5f879c1bcab.png|imageAlt^0|A|R|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|K|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]]]

You can try the way I used to fix my <code>setValue:forUndefinedKey:]:</code> problem.

<a href="https://i.stack.imgur.com/PDjub.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PDjub.png" alt="http://i.stack.imgur.com/PDjub.png"></a>

blocks|key|4345471|text|我也有同样的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4345472|我之前使用故事板建立了一个从文本字段到头文件的连接。后来我决定重命名我的对象的连接，不幸的是，我没有正确地断开连接。如果此问题与我的问题相同，则说明之前存在与按钮的连接，并且标题中的代码已被删除，但连接未被删除。|4345473|检查要连接到的视图中的对象连接。|4345474|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 the same problem:

I had previously made a connection using storyboards from a textfield to a header file. I later decided I wanted to rename my object's connection, unfortunately, I didn't break the connection properly. If this problem was the same as mine, a connection existed to a button previously, and the code in the header was deleted, but the connection was not.

Check the object connections in the view you are segueing to.

blocks|key|1736683|text|您可以使用关联的对象来避免子类化。至于setValue:forKey:和setValue:forUndefinedKey:，请查看头文件(NSKeyValueCoding.h)以了解详细信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1736684|根据您的描述，在您的界面构建器中找到newView，然后右键单击它，您将看到类似loginButton的异常。|1736685|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|$]]

You can use associated objects to avoid subclassing. As for the setValue:forKey: and setValue:forUndefinedKey:, take a look in the header file (NSKeyValueCoding.h) for details.

According to your description, 
Find newView in your interface builder and right click it, 
you will see something like loginButton which is abnormal.

blocks|key|4345458|text|今天我正在工作，我提出了同样的错误，我使用菲利普·米尔斯的响应是正确的，我在一个ViewController.xib中有一些标签没有分配链接，我有五个坏链接，一旦分配了链接，一切都正常，谢谢菲利普·米尔斯的回答。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4345459|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|$]]

Today I was working and I presented this same error, I used the response of Phillip Mills was correct and I had some labels in one ViewController.xib that were not being assigned links, i have five bad links, once assigned links, everything works perfectly, thanks answer of Phillip Mills.

blocks|key|1734606|text|转到FinalViewWithSending视图控制器的xib的连接检查器&删除对登录按钮的引用。在此之后，它将运行。试试看。:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1734607|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 the connection inspector of your xib of FinalViewWithSending view controller &amp; remove the reference of login button. After that it will run. Try It... :)

blocks|key|1734621|text|您可能在前面创建了LoginButton、Cmd%2BShift%2BF并找到了"LoginButton“，删除了引用的Outlet并重新构建。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1734622|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|$]]

Probably, you earlier created the LoginButton, Cmd+Shift+F and find the "LoginButton" and remove the Referencing Outlet and Re-build.

blocks|key|2233439|text|这个回复可能比问题提出的时间晚了，但我只是遇到了这个问题，我尝试了这里发布的所有解决方案，但都没有奏效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2233440|这是我的解决方案，可以帮助任何人在未来。|2233441|首先是问题，：我使用了一个自定义的单元格类并建立了我的连接，然后，我重新命名了我的自定义单元格类，运行了我的应用程序，但崩溃了，并返回了setValue：forUndefinedKey：]错误。|offset|length|style|BOLD|2233442|定制我的解决方案类:单击.xib文件，选择身份检查器，然后在Custom+class+->+中键入新命名的类。应用程序错误已解决。|2233443|entityMap^0|0|0|25|K|0|0|1A|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|$]]|$1|J|3|K|5|6|7|S|8|@$F|T|G|U|H|I]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

This reply might be late relative to the time the question was asked but I just had this issue and I tried all solution posted here but none worked.

Here is my solution which could help anyone in the future.

Firstly the problem, :I used a custom cell class and made my connections, everything worked fine with my app then, I renamed my custom cell class ran my app but crashed with setValue:forUndefinedKey:] error.

My solution : Clicked .xib file, selected Identity inspector and typed the new named class in Custom Class -> Class tag.
App error resolved.

<pre><code>FinalViewWithSending *newView = [[FinalViewWithSending alloc]initWithNibName:@"FinalViewWithSending" bundle:nil];
newView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:newView animated:YES]; //it crashes here with a thread 1 error, SIGABRT error..
</code></pre>

It says:

<pre><code>"Terminating app due to uncaught exception 'NSUnknownKeyException', 
reason: '[&lt;FinalViewWithSending 0x1bef70&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key loginButton.'"
</code></pre>

There is no variable called loginButton so Im not sure why i am getting an error...

Thank you

setValue:forUndefinedKey:]:

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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FinalViewWithSending *newView = [[FinalViewWithSending alloc]initWithNibName:@"FinalViewWithSending" bundle:nil];newView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;[self presentModalV

问setValue:forUndefinedKey:]：
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问setValue:forUndefinedKey:]：
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