[iPhone] this class is not key value coding-compliant for the key view

Question

Level 1

24 points

[iPhone] this class is not key value coding-compliant for the key view

I hope somebody can help me, I'm totally lost on this:

I've used IB to create a simple and basic view. I've set the File's Owner Identity to my ViewControllers class. My ViewController subclasses UIViewController. I've connected File's Owner view to the View created with IB.

When I launch the application crashes with:

* Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIApplication 0x44a000> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key view.'

I believe what this means is that the class (my ViewController) has no property for "view", so when the IB create view awakes it cannot connect to the ViewController's view property.

If I delete the connection from the actual View to File's Onwer view I don't get the exception. However, I do need programmatic access to the View.

Can anybody help? I don't know what else I could have forgotten. As far as I know I don't have to synthesize the view property or anything, I don't even have to create an IBOutlet as all of that is inherited from UIViewController.

Please help.

iMac, Mac OS X (10.5.4), iPhone 2.1

Posted on Sep 16, 2008 7:25 AM

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Answer 1

jerbeers

Level 2

300 points

Sep 19, 2008 8:17 AM in response to BeSharp

If you can run without the view connected and don't get an exception, something is wrong. When the UIViewController loads and you try to display it, it uses the view to know what to show. Double check your class and connections. If you don't find the problem, post more information and we'll try to figure it out.

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Answer 2

sabernar

Level 1

0 points

Nov 2, 2008 8:23 AM in response to jerbeers

I'm having the same problem. I have a TabBarController with two tabs. If I don't set the views to load in Interface Builder, the app opens successfully. If I set one of the tabs to load a View (which I know works because I've tested it independently), the app crashes with:

* Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x30d8b0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key button.'

Any ideas? Am I missing a connection somewhere?

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Answer 3

sabernar

Level 1

0 points

Nov 2, 2008 9:10 AM in response to sabernar

Problem solved. I had to set the Class Identity to the name of the class that is loaded in. I thought that specifying the nib file was enough, but it looks like you need to also set the class for the tab view.

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Answer 4

Latcarf

Level 1

11 points

Dec 1, 2008 12:32 AM in response to sabernar

This one stumped me a bit too.

To elaborate on sabernar's resolution, if you have a TabBarController with a view that's loaded from a nib, you must set the "Class Identity" of the "Tab View Controller Identity" to the same controller class you've set the "File's Owner" to in the nib that loads the actual view.

That's clear as mud... You have to set the Class Identity in two places, not just in the nib of the view you are loading, but also in the TabBarController nib. I hope this helps someone.

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Answer 5

Jan 22, 2009 6:40 AM in response to Latcarf

This is absolutely useful. You just presumably saved me hours or days of difficulties. Thanks for posting the solution.

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Answer 6

Tyrins

Level 1

0 points

Mar 6, 2009 1:34 AM in response to moss2apple

Wow, that' s awesome, I encountered the same problem with ya today when trying implement Pickers in Tabbar, and can't figure out why, the debugger just throw back such vague message and guess what ? I spent like 3 hours banging my head against the wall wonder why it's not working, I using XCode 2.2.1, my debugger wont work ( program won't stop at break points for what ever I tried ), and not very friendly with those newbie like me - really don't know where are all the Apple's software developer 1337 ? As I remembered, all the good ones goes for the hardware, "the rest" goes for the software =)), but thanks again, thanks, and again, click the tab bar, set both the class and nib file would get rid of the errors, if it would help some one, the credit goes to the two above, say thanks to them, like me. Have a nice day guys, I 'ma happy 😀.

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Answer 7

Brooks R

Level 1

0 points

May 16, 2009 1:03 PM in response to BeSharp

I'm having this exact problem working though the Mark and LaMarche Beginning iPhone Development book.

Sorry, but I'm not understanding what to fix. I get that something has to be set in two places. I'm having this error in one project with a text box.

Please explain exactly where and what I need to change. The object is called statusText.

Thanks

2009-05-16 15:52:32.267 ButtonFun[981:20b] Unknown class ButtonFunViewController in Interface Builder file.
2009-05-16 15:52:32.271 ButtonFun[981:20b] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x525cd0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key statusText.'

Message was edited by: Brooks R

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Answer 8

Jun 7, 2009 4:29 PM in response to Latcarf

I just tried my first Tab Bar Controller and before I found this thread, I wasted 3 hours control dragging everything I could think of to fix this error. Thank you so much.

For posterity, in my case the error read "this class is not key value coding-compliant for the key controller"

Thank you again

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Answer 9

Jun 12, 2009 10:11 AM in response to sabernar

Thank you for this post, it solved my problem. I appreciate it.

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Answer 10

killean

Level 1

0 points

Jul 29, 2009 8:25 AM in response to Latcarf

Thanks, I was stuck at the exact problem, your answer saved me lots of time 🙂

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Answer 11

Sep 8, 2009 7:16 PM in response to BeSharp

Sabernar and latcarf,

You guys rule!!! I spent hours on this also until I saw your post. I was getting ready to dump an entire day of work and start over. Thanks.

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Answer 12

Dec 16, 2009 12:41 AM in response to BeSharp

Latcarf's solution worked for me too. I had a Navigation Controller loading a NIB and I just used the class of the "File's Owner" from the NIB at the Navigation Controller.

Thanks a lot!

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Answer 13

Dec 16, 2009 10:16 AM in response to Latcarf

Thanks ever so much. Incredibly useful and saved me pulling my hair out.

Cheers!

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Answer 14

Hopka

Level 1

0 points

Jan 25, 2010 6:34 AM in response to Latcarf

Thanks, that also solved it for me!

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