CODEWITHSUNDEEP
iphoneobjective-ciosnsmutabledictionary
Novarg
Novarg

Reputation: 7450

SIGABRT after setting an object to NSMutableDictionary

The topic says it all. I have a dictionary of dictionaries(yes, it's a dictionaryception!) stored in NSUserDefaults. For some strage reason I get SIGABRT at main.m just right after setting an object to the dictionary. Here's the code:

planDict = [[NSUserDefaults standardUserDefaults]objectForKey:[NSString stringWithFormat:@"Plan_%@", self.planName]];
pageOne = [planDict objectForKey:@"Page_1"];
pageTwo = [planDict objectForKey:@"Page_2"];
pageThree = [planDict objectForKey:@"Page_3"];
[pageOne setObject:@"The Object" forKey:@"First Key"];
[pageOne setObject:@"The Other Object" forKey:@"Second Key"];
//other setters

I've debugged it and it went well till the line [pageOne setObject:@"TheObject" forKey:@"First Key"];. When I stepped over it just crashed(SIGABRT in main.m).

Here's the log right before the crash:

(gdb) po planDict
{
  "Page_1" =     {
  };
  "Page_2" =     {
  };
  "Page_3" =     {
  };
}
(gdb) po pageOne
{
}
(gdb) po pageTwo
{
}
(gdb) po pageThree
{
}

Any help would be appreciated, thank you.

Upvotes: 1

Views: 638

Answers (2)

Tejesh Alimilli
Tejesh Alimilli

Reputation: 1800

I think the real problem is in saving the dictionaries, have you saved mutable dictionary? you are being given an immutable dictionary, so you have to create a mutable copy to it.

Upvotes: 1

thebarcodeproject
thebarcodeproject

Reputation: 565

The dictionary returned by asking NSUserDefaults will be an immutable dictionary, as will any dictionaries within dictionaries etc.

So SETTING an object on the immutable dictionary will indeed throw a SIGABRT error as the object returned does not understand the method you sent to it.

You will want to create a mutable copy of the dictionary instead, and make a mutable copy of each contained dictionary within that dictionary.

Hope that sorts out your error.

Upvotes: 4

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