I'm trying to link a UILabel with an IBOutlet created in my class.
My application is crashing with the following error.
What does this mean?
How can I fix it?
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x6e36ae0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key XXX.'
You may have a bad connection in your xib.
I've had this error many times. While TechZen's answer is absolutely right in this case, another common cause is when you change the name of a IBOutlet property in your .h/.m which you've already connected up to File's Owner in the nib.
From your nib:
Select the object in IB and go to the 'Connections Inspector'.
Under 'Referencing Outlets' make sure that your object isn't still connected to the old property name... if it is, click the small 'x' to delete the reference and build again.
Another common cause if you are using Storyboard, your UIButton might have more then one assignings (Solution is almost the same as for nib):
Open your storyboard and right click the UIButton
You will see that there is more than one assign/ref to this button.
Remove one of the "Main..." greyed windows with the small "x":
Your view controller may have the wrong class in your xib.
I downloaded your project.
The error you are getting is
'NSUnknownKeyException', reason: '[<UIViewController 0x3927310> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key string.'
It is caused by the Second view controller in MainWindow.xib having a class of UIViewController instead of SecondView. Changing to the correct class resolves the problem.
By the way, it is bad practice to have names like "string" in Objective-C. It invites a runtime naming collision. Avoid them even in once off practice apps. Naming collisions can be very hard to track down and you don't want to waste the time.
Another possible reason for this error: when copying & pasting elements from one controller into another, Xcode somehow keeps that link to the original controller, even after editing & relinking this element into the new controller.
Another possible reason for this error:
Bad Outlet.
You have either removed or renamed an outlet name in your .h file.
Remove it in .xib or .storyboard file's Connection Inspector.
One more possible reason
(In my case) Extension of UIView with bindable properties and setting values for those bindable properties (i.e. shadow, corner radius etc.) then remove those properties from UIView extension (for some reason) but the following <userDefinedRuntimeAttributes> remained in xml (of foo.storyboard):
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="color" keyPath="shadowColor">
<color key="value" white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
</userDefinedRuntimeAttribute>
<userDefinedRuntimeAttribute type="number" keyPath="shadowOpacity">
<real key="value" value="50"/>
</userDefinedRuntimeAttribute>
<userDefinedRuntimeAttribute type="point" keyPath="shadowOffset">
<point key="value" x="5" y="5"/>
</userDefinedRuntimeAttribute>
<userDefinedRuntimeAttribute type="number" keyPath="shadowRadius">
<real key="value" value="16"/>
</userDefinedRuntimeAttribute>
<userDefinedRuntimeAttribute type="number" keyPath="borderWidthValue">
<real key="value" value="0.0"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
Solution: Right click on foo.storyboard > Open as Source Code > search by keyPath (i.e. shadowRadius) > Delete the </userDefinedRuntimeAttributes> that causing the problem
Sometimes this has to do with your "Inherit From Target" That value has to be set. With single target apps you can just select Inherit From Target. If you have more then one target select the desired target.
I had this error when I was trying to implement a custom ViewCell for a table. When I highlighted View controller for the XIB and connected to the elements in the CellView caused the error " this class is not key value coding-compliant for the key" once I deleted these it got rid of the error.
Delete the connections in the below image.
Just make sure that you only have the connections with the Table View Cell. To check click on table view cell and in INSPECTOR look for your connections.
I had to delete the app from the simulator/iPhone to get rid of this error.
If it is an iPhone only app, not a universal one, make sure the following field is empty:
Targets > Summary > iPhone/iPod Deployment Info > Main Interface
If you specify an xib there it crashes.
This error indicates that an already connected Interface Builder object is removed/renamed in its owner's source (File's Owner).
Control-click on the Files's Owner in the Interface Builder if you see a exclamation mark you need to fix that.
In the picture below you can see that "aRemovedView" has an exclamation mark on its right, that's because I removed the IBOutlet view object while it was already connected in the IB.
This gives the following error:
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key aRemovedView.'
I had the same problem and while TechZen's answer may indeed be amazing I found it hard to apply to my situation.
Eventually I resolved the issue by linking the label via the Controller listed under Objects (highlighted in the image below) rather then via the File Owner.
Hope this helps.
in my case it was an error in the storyboard source code, follow these steps:
first open your story board as source code
search for <connections>
remove unwanted connections
For example:
<connections>
<outlet property="mapPostsView" destination="4EV-NK-Bhn" id="ubM-Z6-mwl"/>
<outlet property="mapView" destination="kx6-TV-oQg" id="4wY-jv-Ih6"/>
<outlet property="sidebarButton" destination="6UH-BZ-60q" id="8Yz-5G-HpY"/>
</connections>
As you see, these are connections between your code variables' names and the storyboard layout xml tags ;)
My fix was similar to Gerard Grundy's. In creating a custom UITableViewCell using an XIB, I had mistakenly applied the Custom Class name to the File's Owner instead of to the UITableViewCell. Applying the class to the UITableViewCell on the canvas and connecting my IBOutlet properties to it solved the issue.
You only need to specify IBOutlet once, the IBOutlet label your ivar is unnecessary.
Are you instantiating your NIB using your UIViewController? At some point you should be calling [SecondView initWithNibName:#"yourNibName" bundle:nil];
This was happening to me only when debugging on a device (iPhone). The iOS Simulator was working OK. Doing a "Product->Clean" from Xcode seemed to solve the problem, but I have no idea why.
I had exact same error message and thanks (!!) to Kira from http://www.idev101.com I was able to solve the challenge. I only found her site after googling and stacking over all these threads. I'm now posting here for the next one that comes to StackOverFlow and has the same challenge I had since that person will most likely come to this thread over Google.
I realized, that I wrongly made this:
UIViewController *deviceViewController = [[UIViewController alloc] initWithNibName:#"DeviceViewController" bundle:nil];
Instead of THIS:
DeviceViewController *deviceViewController = [[DeviceViewController alloc] initWithNibName:#"DeviceViewController" bundle:nil];
Where
DeviceViewController
Was the name of my Class also known as
DeviceViewController.h
DeviceViewController.m
You'll have to
"import DeviceViewController.h"
in your implementation (.m File) where you want to call e.g. another UIViewController.
I am absolutely not sorry if I am only stating the obvious for beginners like me and may get down votes as this is not exactly related to the question but I was searching 4 (?!?) hours straight now for the answer to these error message. If I can spare this to 1 or 2 people that'd be great :)
PS: For those interested in how the code continues for loading the other UIViewController:
[self presentViewController:deviceViewController animated:YES completion:nil];
It can come from the fact that you have control dragged and created an outlet or action, and forgot to delete it. Even if you deleted the code, or even if you have made enough cmd+Z, you'll need to go in the connection inspector of your storyboard and see if the action or outlet you created is still here or not.
Looking over the other answers it seems like there are a lot of things that can cause this error. Here is one more.
If you
have a custom view
added an #IBInspectable property
and then later deleted it
Then you may also get an error similar to
Failed to set (xxx) user defined inspected property on [Your Custom
View] ...: this class is not key value coding-compliant for the key
[xxx].
The solution is to delete the the old property.
Open the Identity inspector for your class, select the property name under User Defined Runtime Attributes, and press the minus button (-).
This happens to me when my view controller originally had an .xib file, but now is created programmatically.
Even though I have deleted the .xib file from this project. The users iPhone/iPad may contain an .xib files for this viewcontroller.
Attempting to load an .xib file usually causes this crash:
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x18afe0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key welcomeLabel.'
Solution when creating it programmatically may be this:
-(void)loadView {
// Ensure that we don't load an .xib file for this viewcontroller
self.view = [UIView new];
}
"Module" property of View Controller in the Identity Inspector might be different than what you expected. Also make sure that new classes are added to your target list.
I had a similar problem for a project that has two targets (with their own MainWindow XIB). The fundamental issue that caused this error for me was that the UIViewController class wasn't included in the second project's resource list. I.e. interface builder allowed me to specify it in MainWindow.xib, but at runtime the system couldn't locate the class.
I.e. cmd-click on the UIViewController class in question and double-check that it's included in the 'Targets' tab.
Just to add to this, because I was getting this error as well. Going through all these answers most seem to apply to working with the UI and storyboard stuff. I know the original poster did seem to be working with the UI but when searching for possible reasons for this error mostly all questions lead back to this question with those others being closed as duplicates or simply having issues with connecting things in a storyboard so I will add my solution.
I was working on coding a web service in Swift 2. I had built all the needed proxy objects and stubs. As I looped through the returned XML I was dynamically instantiating my objects, which all came from NSObject and using setValue:forKey on them. Every time setValue:forKey tried to set a property it blew up with this error.
I had a switch statement for each type I was dealing with (e.g. Bool?, CShort?, String?) and for each XML node I went through and checked what the type was on the object and then converted the value to that type and attempted to set it with setValue:forKey.
Eventually I started commenting out all these setValue:forKey lines and found that my default switch statement case did work for String?.
I finally figured out that you can't use optional swift types with setValue:forKey unless they have a direct mapping to an Objective-C type like String? or NSNumber?. I ended up changing all CShort? types to NSNumber? since that has a direct mapping. For Bool? in my case it was fine for me to just use Bool and initialize it to false. Others may not have that luxury.
Anyway what a headache that was so hopefully this helps someone else who has a similar problem and keeps getting redirected to this question and saying to themselves, "I am not doing anything in UI!!".
So lastly to reiterate one more time Key-Value Coding does not work with optionals. Below I ended up finding somewhere but I forget where so to whoever posted this I apologize and would give credit if I remembered where I found this but it saved my life:
You cannot use KVC on an Optional Int property, because KVC is Cocoa /
Objective-C, and Objective-C cannot see an Optional Int - it is not
bridged to Objective-C. Objective-C can only see types that are
bridged to Objective-C:
class types that are derived from NSObject
class types that are exposed with #objc
Swift structs that are bridged
"this class is not key value coding-compliant for the key"
I know its a bit late but my answer is different so I thinks it needs to be posted, I was pushing the second controller in wrong way, Here is sample
Wrong Way to Push Controller
UIViewController* controller = [[UIViewController
alloc]initWithNibName:#"TempViewController" bundle:nil];
[self.navigationController pushViewController:controller animated:true];
Correct way
TempViewController* controller = [[TempViewController
alloc]initWithNibName:#"TempViewController" bundle:nil];
[self.navigationController pushViewController:controller animated:true];
I did not found any answer like above so may be it can help some one having same issue
That might be the case of referencing a component from Xib Interface that you have renamed or delete. Re-referencing works for me.
I just had this issue in my duplicated project and solved by checking 2 places:
1- Make sure you have the .m file in the list -> Project - Build Phases - Compile Sources
2- After that, go to interface builder (probably this is an error occures with only IB) and unlink all properties, labels, images, etc... Then re-link all. I have realized that I've removed an attribute but it was still linked in IB.
Hope it works for some.
Another "not compliant" issue I found was when I managed to have two copies of a class for some reason.
I was adding keys to the wrong copy. Interface Builder still saw the keys and let me hook up to them, but at runtime it was using the other copy of the class that didn't have the new keys.
To find which was the "right" copy I used XCode's cmd-click on the class name elsewhere to jump to the correct copy, then I killed off the bad unused copies (after bringing over my edits from the un-used copy first).
Moral of the story: duplicate class files are bad.
This error is something else!
Here is how i Fixed it. I'm using xcode Version 6.1.1 and using swift. I got this error every time my app tried to perform a segue to jump to the next screen. Here what I did.
Checked that the button was connected to the right action.(This wasn't the problem, but still good to check)
Check that the button does not have any additional actions or outlets that you may have created by mistake. (This wasn't the problem, but still good to check)
Check the logs and make sure that all the buttons in the NEXT SCREEN have the correct actions, and if there are any segues, make sure that they have a unique identifier. (This was the problem)
One of the segues did not have a unique identifier
One of the buttons had an action and two outlets that I created by mistake.
Delete any additional outlets and make sure that you the segues to the next screen have unique identifiers.
Cheers,
In my case. I didn't have missing outlets in xib-files after merging.
Shift + Command + K
solved my problem. I cleaned my project and rebuilt.
I had the same symptom. The root cause was that the "Target Membership" for my source file was not set to the correct target. I assume that means my class wouldn't get built and included in my app.
To correct it:
Highlight your .m file.
In the right pane, select the File Inspector.
Under the "Target Membership" section, make sure the appropriate build target is checked.
Hope this helps somebody out there.
If you have a custom UIViewController subclass with IBOutlets that are causing problems the only set of steps I found to actually get rid of the error were
.1 Change the class to UIViewController
.2 Disconnect all the outlets (they will all have the yellow warning triangle now) - it may be enough just to disconnect the problematic outlet(s).
.3 Do all the standard steps - ↑⌘K, delete Derived Data (, prayer mats, worry beads)
.4 Launch the app - go to the problematic scene.
.5 Kill the app, go back to Interface Builder change the class back to your custom class name.
.6 Reconnect your outlets.
Launch the app & this will normally have cleared up the key-value compliance issues.
In my case it was the module that was specified to the wrong target. Simply deleting the module name and checking Inherit Module from target did the trick.
In my case, this was caused by referencing the wrong Nib:
BMTester *viewController = [[BMTester alloc] initWithNibName:#"WrongNibName" bundle:nil];
I was getting this error with storyboards. The above solution didn't seem to be the problem so I ended up deleting the view controller and adding it back in again (and of course reconnecting the segue and reassigning the class) which fixed it. I don't know what it really was, but I had renamed the associated view controller class shortly before this started, so maybe that had hosed something.
for the past few days i keep on getting this error everytime i run a build in xCode:
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIApplication 0x1dd4a1c0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key playBtn.'
at the begining it was in something i have made.
than i deleted it and it was still there - in an object (like this playBtn here) that did not exist anymore.
and now - in every single app i am trying to debug.
if on my iphone or in the simulator - the same.
i just can't run anything now !!
*clean doesn't work ! *
what do i do? i can't work like this..
notice:
solved. it was a problem with the appdelegate.m
thanks for who helped.
Check your IBOutlet connections in your XIB
You said playBtn does not exists, so check if connection still exist for the same, They will show ! mark in place of dot in connections.
I bet that You've got your File's Owner stuff messed up in your xibs.One of your views is set up to be the playBtn of the the File's Owner. However, when it's time to unarchive the nib, the owner doesn't have an playBtn property, so the unarchiving is failing.
Two Things you can do :
1) Check your "Connections Inspector" tab for the view that's throwing the error.
Remove all the Outlet Connections and re-connect all the Outlets.
2)
GoodLuck !!!
The problem is that you are indirectly (presumably when one of your nibs is unpacked) calling -setValue:forKey: on your UIApplication.
You can reproduce this issue by creating a new empty iPhone project and adding the following line to your app delegate's -application:didFinishLaunchingWithOptions:.
[[UIApplication sharedApplication] setValue:[[UIButton alloc] init] forKey:#"playBtn"];
Without a backtrace or even a complete log, it's hard to be sure, but it looks quite likely that you are having the same issue that is described here.
I solved it.
it was a problem with the appdelegate.m with the uitabbar.
thanks for who helped and those who tried :)
I am getting a strange crash due to NSLocalizedString. -[CFString retain]: message sent to deallocated instance 0x3c6ad0.
I am sure it's due to the NSLocalizedString as when I replace it with static string. everything goes fine. Here is the line where I got the error.
[_backButton setTitle:NSLocalizedString(sBackButtonDefaultTitle, nil) forState:UIControlStateNormal];
The sBackButtonDefaultTitle is "Back".
What makes it random is that it crashes sometimes and sometimes not.
EDIT:
The sBackButtonDefaultTitle is defined in a header file
#define sBackButtonDefaultTitle #"Back"
The header is, of course, imported into the .m file.
EDIT:
More details...this back button title is used application-wide. In almost every controller. However, the crash only happens AFTER pushing certain controller.
This controller contains a web view. If I tap the Back button, the controller is poped. No crash. But If I push any controller with the same "Back" button, the application crashing, giving the error I illustrated above.
It's really mysterious. I hope someone can help me fix it.
Surely because you're sBackButtonDefaultTitle has been deallocated when you call NSLocalizedString.
I guess it's an auto-released string.
You may want to check with NSZombie enabled, to be sure.
You may need to retain the sBackButtonDefaultTitle string, when you create it, and release it after the NSLocalizedString call.
This crash is due to sBackButtonDefaultTitle getting released before that point in your code. Check to make sure you are retaining it when you take possession of it and that you are releasing it after using it in that line of code.
A good reason of using NSLocalizedString is to support more than one languages for your app. NSLocalizedString usually goes well with string resource file so that the system can dynamically decide with language it should use to populate your UI. I never tried to use the NSLocalizedString as the way you do, but I can tell you use a string resource file will definitely work. Take a look at Apple's Guidelines for Internationalization
and string resource file
Hope it helps.
A description of the problem is as follows:
I have a view, say, view A. To enter certain data, I have an alert,with a text field inside it, which pops up. Once the user enters data into the text field, i have an alertView:didDismissWithButtonIndex: function as follows :
- (void)alertView:(UIAlertView *)alertView:didDismissWithButtonIndex:(NSInteger)buttonIndex {
[ amountEntered resignFirstResponder]; //dismiss keyboard
if (buttonIndex == 1) { //OK clicked, do something
if(lblShowTypedText.text)
data.investmentAmount = lblShowTypedText.text ;
[myTable reloadData];
}
}
Then I have a submit button on my View A, which when clicked pops back to the previous view. Here is where my app crashes. There is no message in the console, however after many runs, I got one message like this:
* -[NSCFType alertView:didDismissWithButtonIndex:]: unrecognized selector sent to instance 0x3c4dce0
2010-06-24 15:33:22.970 BankingAppln[2895:207] CoreAnimation: ignoring exception: * -[NSCFType alertView:didDismissWithButtonIndex:]: unrecognized selector sent to instance 0x3c4dce0
Thus i have narrowed down the problem to the alertView:didDismissWithButtonIndex: function. If I do not call the alert, but directly pop back to the previous view, everything is fine.
I must be doing something wrong in my alertView:didDismissWithButtonIndex: function.
Pls help!!
A few things to check:
You set the delegate of the AlertView to the right class (View A)?
Your class (View A) implements the UIAlertViewDelegate protocol.
Probably not, but you never know: You're classname is not equal to a name in apple's private api (don't laugh, happened to me a week ago, costed me 2 hours to figure out)?
EDIT:
Another thing to check:
Your delegate method has the right return type (I think it's "void" in that case)?
Do you really have this method, alertView:didDismissWithButtonIndex:, in your class? and post the code when you call it as well
You need to post where you call the method..but from the error message you gave, the problem is you are calling your method incorrectly.
if it is a method you defined yourself with the implementation above use
[self alertView:myAlertView didDismissWithButtonIndex:myIndex];
also, in your declaration, you have a semicolon after the parameter alertView and you just need a space.
I faced a similar problem and it turns out that with Automatic Reference Counting in place, I needed to keep a reference to the popup around as a property so that it would not be reference collected. That much was fine but I got overzealous and started doing stuff like popup = nil; explicitly and that got me into trouble because some of the delegate methods for the popup were called after I had nil'ed out the reference that I was holding onto and now this popup was not around anymore and the framework crashed due to this little fact.
[__NSCFString alertView:didDismissWithButtonIndex:]: unrecognized selector sent to instance 0x9117c0
So I decided to simply keep allocating a new popup when it was needed and not explicitly nil'ing out the older references. This fixed the issue for me.