NSUnknownKeyException setValue:forUndefinedKey:

Question

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key buttonOfFirstView.'

Why do I get this error? I am trying to make a table cell though XIB. After I add this code it throws the above exception.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *CellIdentifier = @"MyCell";

    MyTableViewCell *cell = (MyTableViewCell*) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        NSArray *arrayCellXib = [[NSBundle mainBundle] loadNibNamed:@"MyTableViewCell" 
                                                              owner:self 
                                                            options:nil];

....
} 
.....

return cell;
}

How to resolve it?

a button inside table cell IBOutlet UIButton buttonOfFirstView; — gauravds, May 31 '12 at 06:51
I solved it, changed file owner to NSObject an problem has been solved. Why I dont know. But it is running fine. — gauravds, May 31 '12 at 07:25

score 49 · Accepted Answer · answered May 31 '12 at 06:42

49

Check your references of your outlets in your XIB, one of them is probably referencing a property (buttonOfFirstView) that does not exist anymore

answered May 31 '12 at 06:42

iTukker

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score 2 · Answer 2 · edited Oct 30 '19 at 15:38

2

Set File's Owner class to NSObject and set UITableViewCell class to your custom class in XIB. It will solve the issue.

edited Oct 30 '19 at 15:38

Ronan Boiteau

9,608
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answered Oct 04 '14 at 19:48

Augustine P A

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iOS Developer · Answer 3 · 2012-05-31T06:54:07.240

1

This is exactly an issue related to the key buttonOfFirstView in your case.If it is a button it may be connected wrongly in any of your xibs

edited May 31 '12 at 06:54

answered May 31 '12 at 06:42

iOS Developer

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I didn't get u, please explain more – gauravds May 31 '12 at 06:51
If it is not working,just rename your button.And connect it properly. – iOS Developer May 31 '12 at 06:56
not work for me, same exceptions – gauravds May 31 '12 at 07:04
have u synthesized ur button? – iOS Developer May 31 '12 at 07:09
u shud import MyTableViewCell in ur table view – iOS Developer May 31 '12 at 07:14
refer this http://stackoverflow.com/questions/2242517/nsunknownkeyexception-exception-raised-applicaton-crashes – iOS Developer May 31 '12 at 07:15

score 0 · Answer 4 · answered Aug 08 '13 at 19:55

0

Quit the iOS simulator. Make sure you save the project and then quit xCode and restart and everything will be fine. I did that and it worked for me. that's if everything else is hooked up correctly.

answered Aug 08 '13 at 19:55

kRon Host

1

score 0 · Answer 5 · answered Sep 03 '13 at 17:45

0

you need to clean your project: go to Product -> Clean

this works for me

answered Sep 03 '13 at 17:45

Matias Elorriaga

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NSUnknownKeyException setValue:forUndefinedKey:

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