Terminating app due to uncaught exception 'NSInvalidArgumentException', NSUserDefaults?

Question

So I'm getting an issue with NSUserDefaults when saving an array. All my code works up until this point, but as soon as I tried to save the arrays in NSUserDefaults I started having issues, mostly that now for some reason it doesn't save.

- (IBAction)unwindToList:(UIStoryboardSegue *)segue
 {

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"MMMM dd, yyyy"];

AG_AddItemViewController *source = [segue sourceViewController];
AG_Storage *item = source.store;

NSDate *dateCreated = item.creationDate;



NSString *todayString = [dateFormat stringFromDate:self.todayDate];
NSString *dateCreatedString = [dateFormat stringFromDate:dateCreated];
NSString *tomorrowString = [dateFormat stringFromDate:self.tomorrowsDate];
NSString *yesterdayString = [dateFormat stringFromDate:self.yesterdaysDate];


//Set up file storage!

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];



if (item.itemName != nil) {

    if ([dateCreatedString isEqualToString:todayString]) {
        [self.mainArray addObject:item];
        [tableView reloadData];
        [defaults setObject:self.mainArray forKey:todayString];
        [defaults synchronize];

        NSLog(@"Saved");

    }
    else if ([dateCreatedString isEqualToString:tomorrowString]){
        [self.tomorrowArray addObject:item];
        [tableView reloadData];

        NSLog(@"THIS WORKED TOO :D");
    }
    else if ([dateCreatedString isEqualToString:yesterdayString]){
        [self.yesterdayArray addObject:item];
        [tableView reloadData];

        NSLog(@"THIS WORKED");
    }
    else{

    }
}
 }

mainarray and the other mutable arrays are all declared as properties in the interface, so they shouldn't be causing this issue.

2014-03-26 15:36:46.561 AgendaBk[32702:a0b] <AG_Storage: 0x8cc2c90>
     2014-03-26 15:36:46.563 AgendaBk[32702:a0b] Attempt to set a non-property-list object       (
     "<AG_Storage: 0x8cc2c90>"
     ) as an NSUserDefaults value for key March 26, 2014
     2014-03-26 15:36:46.565 AgendaBk[32702:a0b] *** Terminating app due to uncaught exception          'NSInvalidArgumentException', reason: '*** -[NSUserDefaults setObject:forKey:]: attempt to    insert non-property list object (
    "<AG_Storage: 0x8cc2c90>" ) for key March 26, 2014'

libc++abi.dylib: terminating with uncaught exception of type NSException

Note that this issue is only happening when I try to get the NSUserDefaults going. Everything else seems to be working fine, and when I added individual strings earlier it worked fine. I would really like to use this to store my arrays though if i can manage it.

http://stackoverflow.com/questions/10305659/not-sure-how-to-handle-terminating-app-due-to-uncaught-exception-nsinvalidargu — Obj-Swift, Mar 26 '14 at 19:59

score 0 · Answer 1 · answered Mar 26 '14 at 19:56

NSUserDefaults only supports plist objects so you can't save custom objects into it. You're adding an object of type AG_Storage into your array and saving it, which isn't allowed. You'll want to look at NSKeyedArchiving instead by conforming AG_Storage to the NSCoding protocol. Let me know if you need more guidance on that.

score 0 · Answer 2 · answered Mar 26 '14 at 19:58

0

Documentation says:

The NSUserDefaults class provides convenience methods for accessing common types such as floats, doubles, integers, Booleans, and URLs. A default object must be a property list, that is, an instance of (or for collections a combination of instances of): NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary

But you are trying to save AG_Storage instance.If you want to store any kind of objects you should try so serialize you object. For example to implement NSCoding protocol.

answered Mar 26 '14 at 19:58

Krivoblotsky

1,492
11
17

So should I make a local NSMutableArray with the contents of `mainarray`? Would that fix it or would I have to declare this in the class that all this info is coming from? – user3430084 Mar 26 '14 at 20:00
Nope, all of your NSMutableArray objects must be: NSData, NSString, NSNumber, NSDate instances. – Krivoblotsky Mar 26 '14 at 20:01
So how do I go about converting them? I'm sorry I'm pretty new to some of these concepts. I get that it can't be stored because its an AG_Storage instance, but how do I set the array so I can store it correctly? Is there another way to save data that would be easier than this? I'm going to need to delete this info too – user3430084 Mar 26 '14 at 21:08

score 0 · Answer 3 · edited May 23 '17 at 11:58

0

Take a look at this answer to a similar issue (I believe it's the same problem you are having): https://stackoverflow.com/a/19720674/694080

Your AG_Storage isn't one of the default NSCoding-compliant classes.

edited May 23 '17 at 11:58

Community

1
1

answered Mar 26 '14 at 19:59

Cameron

1,142
8
32

score 0 · Answer 4 · answered Oct 08 '15 at 14:45

0

In case someone comes up with this problem, make sure there's no null/nil in the items you're saving, this will throw an exception if you're trying to save a null object.

answered Oct 08 '15 at 14:45

Waclock

1,686
19
37

Terminating app due to uncaught exception 'NSInvalidArgumentException', NSUserDefaults?

4 Answers4