Class is not key value coding-compliant [duplicate]

Question

I know the meaning of this error, but I'm really struggling with it, and I need someone's help :

2010-09-21 15:03:11.562 Stocks[5605:207] *** Terminating app due to uncaught 
exception 'NSUnknownKeyException', reason: '[<NSObject 0x499fb20> 
setValue:forUndefinedKey:]: this class is not key value coding-compliant 
for the key actionText.'

There is my code here :

AlertCell.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>


@interface AlertCell : UITableViewCell {
    IBOutlet UILabel *actionText;
}

@property (retain, nonatomic) UILabel *actionText;

@end

And

AlertCell.m

@implementation AlertCell
@synthesize actionText;
   
- (void)dealloc {
    [actionText release];
    [super dealloc];
}
   
@end

The problem happens just there :

- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    static NSString *CellIdentifier = @"Cell";
    
    AlertCell *cell = 
      (AlertCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
    if (cell == nil) {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"AlertCell" 
                                                         owner:nil 
                                                       options:nil];
        for (id oneObject in nib) {
            if ([oneObject isKindOfClass:[UITableViewCell class]]) {
                cell = (AlertCell *)oneObject;
                break;
            }
        }
    }    
    
    
    cell.actionText.text = [arrayAlert objectAtIndex:indexPath.row];
    return cell;
}

On this line :

NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"AlertCell" 
                                             owner:nil 
                                           options:nil];

As asked, here is my header for the TableViewCOntroller :

#import <UIKit/UIKit.h>


@interface AlertesViewController : UITableViewController {
    NSMutableArray *arrayAlert;
}

And you can see my XIB file (as XML): http://pastebin.com/FDVzLYZu

@end

Can anyone help me ? Thanks a lot !

Can you show your header file for your UITableViewController as well? I suspect that you are setting the wrong object as "File's Owner" for the AlertCell — falconcreek
– falconcreek, Commented Sep 21, 2010 at 14:26

theprof · Accepted Answer · 2011-07-21 05:15:11Z

102

you probably based your code on a web tutorial such as the one at http://www.e-string.com/content/custom-uitableviewcells-interface-builder or http://www.icodeblog.com/2009/05/24/custom-uitableviewcell-using-interface-builder/

Your problem (and I'm 99% sure this is where you tripped up, I just made the same mistake) is that in interface builder you linked your IBOutlets from File's Owner when you should link them from the cell view. This is why you are getting the errors.

answered Jul 21, 2011 at 5:15

theprof

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8 Comments

Isaac Over a year ago

THAT's the only enlightening answer among tons of misleading ones in this and other threads. THANKS! :D

Tom Redman Over a year ago

I followed that exact tutorial and had the exact problem. This fix worked for me. Thanks a lot :)

1amtoo1337 Over a year ago

WOW! I have been debugging this problem for some time. Your answer finally saved me ;). Thanks a lot. I have run into this problem before and went to very very extreme measures to work around it, eventhough I knew the methods to get it working were a bit ugly. THANKS!!!

software evolved Over a year ago

Just to be perfectly clear about this: In IB, the "file owner" is going to refer to the ViewController that will show the custom cell. Usually you link interface objects to outlets there. NOT FOR CUSTOM CELLS! In the property inspector, select the custom cell, and set the "custom class" property to the class name that will have the outlets. Then attach interface objects to the .h of the class file, NOT File's Owner.

Suran Over a year ago

Please accept this as the correct answer! The 2nd para with 2 lines is enough to solve this problem! By the way @theprof, thanks a lot!

|

dannywartnaby · Accepted Answer · 2010-09-21 15:19:38Z

84

There are a couple of options to resolve this - i'll let you decide which is the most appropriate.

The reason it's failing is because the owner is being passed as nil. You're binding the actionText outlet to the file's owner in IB, but then when loading the nib, the owner is nil. I'd guess that when loading with a nil owner behind the scenes an NSObject is used, which is why you're getting the key/value error.

My previous advice to pass the cell as the owner would also fail as I didn't know how the Nib is constructed; the cell is nil as you've yet to create it (and dequeue is passing nil back, so even pass cell as the owner is still essentially passing nil).

Two options:

Instantiate a new cell in your -cellForRowAtIndexPath:(NSIndexPath *)indexPath implementation, and pass that new cell as the owner (but i'd guess that this isn't the best solution for you)
Or, and I'd suggest this is the better solution, change the binding of actionText in your nib file to the Alert Cell and not the file's owner (You have File's Owner and an Alert Cell - bind the UILabel to the actionText outlet of the Alert Cell, and not the File's owner, which is what's being done at present) - I suspect this is what you want. With that in mind file's owner can become an NSObject again.

------- Original answer kept below as the file's owner class is also a common cause for this error -------

It suggests that you've 'instantiated' an AlertCell in InterfaceBuilder, and you're binding something to actiontext, but the class isn't set to AlertCell, it's still NSObject?

Take a look at the class text box on the identify tab of the tool palette for that object in Interface Builder. The class should be AlertCell, but i'd guess it's still set to NSObject.

As an aside, and feel free to ignore this advice, but there are a couple of extra things i'd encourage you to do, purely from an Objective C expectations/conventions point of view:

Name your files after your class (upper case the first character of the filename).
Prefix your class names; two uppercase characters, typically your initials (i'd name it DWAlertCell, for example).

edited Sep 21, 2010 at 15:19

answered Sep 21, 2010 at 13:36

dannywartnaby

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12 Comments

Rob Over a year ago

Unfortunately, I think that's not the problem. In IB, I can see the type of "File Owner" and "Alert Cell" set to "Alert Cell". Have you any another idea ?

Rob Over a year ago

Sorry for the typo error, my class files are capitalized ! I'll correct it soon. I'll try to prefix my class names, but I think that won't solve my current issue.

dannywartnaby Over a year ago

Truthfully i'm sure it's your IB config - i've hit this myself a couple of times. The other things i'd suggest (and without knowing the wider project, this may not be the cause), the owner of the loaded nib should really be the cell you've instantiated: [[NSBundle mainBundle] loadNibNamed:@"AlertCell" owner:cell options:nil]. Without an owner i'm not sure where the actionText outlet will be bound to.

Rob Over a year ago

Even if I set cell as the owner of the nib loaded, it failed :/

dannywartnaby Over a year ago

Can you share your nib file? The problem is loading your nib, i'm convinced the problem is with the way it's configured in IB.

|

Deepend · Accepted Answer · 2014-10-19 19:40:08Z

7

I had the same problem, and I could not find the mentioned variable/element in any file. I followed the following steps.

Environment: Xcode 6

Go to the Xib file, and right click (Ctrl+Mouse Click) on each UI element to see its associations.
In its referencing outlets section, you will be able to locate the erroneous association.
Remove that association
Clean the solution and build folder
Reset Simulator
Rebuild and run the project.

edited Oct 19, 2014 at 19:40

Deepend

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answered Oct 19, 2014 at 19:00

Muhammad Umar

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Comments

Baljeet Singh · Accepted Answer · 2014-10-12 07:48:31Z

5

check UIControl Referencing OutLet Property Name from nib/StoryBoard File

answered Oct 12, 2014 at 7:48

Baljeet Singh

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Comments

user2063513 · Accepted Answer · 2013-02-18 08:02:21Z

4

Make sure select cell to put custom class not File's Owner to add custom class on right side top and if You have done so, Before you make any changes remove outlet connection and then remove custom class from File's Owner and add Class to Cell view

answered Feb 18, 2013 at 8:02

user2063513

Comments

Tatarasanu Victor · Accepted Answer · 2012-10-09 12:06:12Z

3

Maybe it helps: Indentity Inspector when you have selected file's owner - UITableViewCell, when you have selected the cell inside Objects Your custom cell nane

answered Oct 9, 2012 at 12:06

Tatarasanu Victor

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Comments

Mário Carvalho · Accepted Answer · 2012-08-02 11:24:02Z

2

After 2 hours on this, I realized that i forgot to

@synthesize tableView = _tableView;

Hope it helps.

Mário

answered Aug 2, 2012 at 11:24

Mário Carvalho

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Comments

Gank · Accepted Answer · 2015-01-15 06:20:50Z

0

#import <UIKit/UIKit.h>

@interface ReceptionDetailCell : UITableViewCell

@property (weak, nonatomic) IBOutlet UILabel *productName;

@property (weak, nonatomic) IBOutlet UILabel *billType;

@property (weak, nonatomic) IBOutlet UILabel *bookTime;

@property (weak, nonatomic) IBOutlet UILabel *doctorName;

@property (weak, nonatomic) IBOutlet UILabel *downBillManName;




@end

Checkout out the Cell code and storyboard setting, whether they are all exist, maybe you have changed their names.

answered Jan 15, 2015 at 6:20

Gank

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