Bad Access on storing NSUserDefaults

Question

I'm using the following code to save a number in NSUserDefaults:

NSUserDefaults *prefs = [[NSUserDefaults standardUserDefaults]retain];
NSNumber *num = [[NSNumber alloc]initWithInt:indexPath.row];
[prefs setValue:num forKey:@"randomkeyhere"];

Only at some points I get a

EXC_BAD_ACESS (code=2).

Am I doing anything wrong? Is this undefined behavior or something of that sort? I'm wondering why I only get it sometimes and not always.

so crazy , you retainning a Singleton – cloosen Jul 29 '12 at 06:08 — cloosen, Jul 29 '12 at 06:08

The Kraken · Accepted Answer · 2012-07-29T06:47:22.267

1

NSUserDefaults standardUserDefaults is a singleton object managed by iOS. It is not a new object that you initiate. Get rid of the retain.

Also, try setting a breakpoint in the method to see exactly where the program is crashing. Post the error's from the console below:

edited Jul 29 '12 at 06:47

answered Jul 29 '12 at 06:34

The Kraken

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Did that, same thing happening. And thanks for the feedback, I'm new to iOS programming. Do you have any idea why this is only happening from time to time though? – Kgrover Jul 29 '12 at 06:44
never mind, I was able to debug it, it was an error somewhere else. – Kgrover Jul 29 '12 at 06:49
Awesome, glad you got it figured out. – The Kraken Jul 29 '12 at 06:51

score 0 · Answer 2 · edited May 23 '17 at 10:34

0

in the singleton , the retain is like this

- (id)retain
{
    return self;
}

so , the retainCount will not add 1.

you can look at this :

singleton in objective c

edited May 23 '17 at 10:34

Community

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answered Jul 29 '12 at 06:47

cloosen

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Bad Access on storing NSUserDefaults

2 Answers2

singleton in objective c