saving NSMutableArray in NSUserDefaults

Question

In my and successBlock below, Im saving the info to my NSMutableArray selectedPhotos. BTW, the info is a ALAsset url. URLs from my camera roll.

     } andSuccessBlock:^(NSArray *info) 
            [self.selectedPhotos setArray:info];

What I needed to do is save it via NSUserDefaults. Here is how I save it in NSUserDefaults:

            [[NSUserDefaults standardUserDefaults] setObject:self.selectedPhotos forKey:@"PickedImage"];
            self.selectedPhotos = [[NSUserDefaults standardUserDefaults] objectForKey:@"PickedImage"];
            [[NSUserDefaults standardUserDefaults] synchronize];
            NSLog(@"SelectedPhotos:: %@", self.selectedPhotos);

But the problem is, when I log it it says NULL. How can I save my array via NSUserDefaults. Thanks for the help.

LOG:

SelectedPhotos:: (null)
*** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '(
    "ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=119A0D2D-C267-4B69-A200-59890B2B0FE5&ext=JPG",
    "ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=92A7A24F-D54B-496E-B250-542BBE37BE8C&ext=JPG",
    "ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=77AC7205-68E6-4062-B80C-FC288DF96F24&ext=JPG" )' of class '__NSArrayM'.  Note that dictionaries and arrays in property lists must also contain only property values.

Jonathan Grynspan · Accepted Answer · 2012-10-08 02:41:26Z

1

Look at the log you got:

Note that dictionaries and arrays in property lists must also contain only property values.

An ALAsset is not valid for storage in NSUserDefaults. Only NSString, NSNumber, NSData, NSDate, NSArray, and NSDictionary can be stored there.

You must figure out what data from the asset you want to store, and store that. I suspect the URL is all you're really interested in storing, but without knowing what you plan to do with the data, I can't be sure.

answered Oct 8, 2012 at 2:41

Jonathan Grynspan

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3 Comments

Bazinga Over a year ago

I am using the AGImagePickerController which, after picking images and display a checkmark beside it, the checkmark can be retain even when going to different views, but the problem is when the app is exited it is also deallocated. So I need to store that part into a NSUserDefaults. So when app restart, the checkmark in the picker can be retained again or redisplay.

Jonathan Grynspan Over a year ago

What data from the assets do you think you'd need to implement that?

Bazinga Over a year ago

Here in my question it is connected stackoverflow.com/questions/12670025/image-url-saving

score 0 · Accepted Answer · 2012-10-08 02:42:37Z

0

To you save a NSMutableArray with ALAsset into the NSUserDefaults, you need to convert it in a NSData and save. Take a look:

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSData *arrayData = [NSKeyedArchiver archivedDataWithRootObject:self.selectedPhotos];
[userDefaults setObject:arrayData forKey:@"selectedPhotos"];

And to log (and read) it, you need simple to:

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSData *arrayData = [defaults objectForKey:@"selectedPhotos"];
NSLog(@"%@", [NSKeyedUnarchiver unarchiveObjectWithData:data]);

edited Oct 8, 2012 at 2:42

answered Oct 8, 2012 at 2:33

user1617119

3 Comments

Jonathan Grynspan Over a year ago

This is factually incorrect. In regular execution, you never need to send -synchronize.

user1617119 Over a year ago

Take a look at edit, @Superman. Here I'm converting it in a NSData. Hope this solves your question.

Bazinga Over a year ago

crashes with Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ALAsset encodeWithCoder:]:

Community · Accepted Answer · 2017-05-23 12:14:41Z

0

-Try saving it after archiving it (i.e converting to NSData) .Please have a look at the following answer Why NSUserDefaults failed to save NSMutableDictionary in iPhone SDK?

edited May 23, 2017 at 12:14

CommunityBot

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answered Oct 8, 2012 at 5:51

Javal Nanda

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4 Comments

Javal Nanda Over a year ago

it might be crashing because you might have forgotten to encoded one of your variable , which you are trying to save in userdefaults

Bazinga Over a year ago

the variable im using is NSMutableArray

Javal Nanda Over a year ago

ok,it crashes because AlAsset will try to encodeWithCoder. Encoder works in a way that each custom objects encodeWithCoder is called until each primitive types of the custom objects are encoded. Perhaps,in this case you might need to subclass ALAsset to encode URL also..

Javal Nanda Over a year ago

try subclassing ALAsset and provide initWithCoder and decodeWithCoder for it

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