iPhone:Store & Retrieve NSMutableArray object

Question

appDelegate.categoryData = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                         categoryStr, @"name",image ,@"image", nil];

[appDelegate.categories addObject:appDelegate.categoryData];
NSLog(@"Category Data:--->%@",appDelegate.categories);

I am successfully added object mutabledictionary into mutuablearray but I want to store that array and retrieve when application is launched so please give me idea to develop this functionality.

Thanks in advance.

if you want that array permanently it is impossible because that array is initialize when the app is launch ..Solution is store that in userDefaults then u get any time any where in your app until reset your app — Narayana Rao Routhu
– Narayana Rao Routhu, Commented Sep 30, 2011 at 11:17
so please tell me how can i use NSUserDefaults to store & retrieve array — Nikunj Jadav
– Nikunj Jadav, Commented Sep 30, 2011 at 11:24

Narayana Rao Routhu · Accepted Answer · 2011-09-30 13:16:23Z

    //you can save array in NSUserDefaults like below
    if ([[NSUserDefaults standardUserDefaults] valueForKey:@"detail"]==nil)
    {
        NSMutableDictionary *dic_detail = [NSMutableDictionary dictionaryWithObjectsAndKeys:
             categoryStr, @"name",image ,@"image", nil];
            NSMutableArray *ary_detail = [[NSMutableArray alloc] init];
            [ary_detail addObject:dic_detail];
            [[NSUserDefaults standardUserDefaults] setObject:ary_detail forKey:@"detail"];
            [[NSUserDefaults standardUserDefaults] synchronize];
     }

            //if you want read that array you can read like below in your app  
            NSMutableArray *array = [[NSMutableArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:@"detail"]];

    - (void)applicationDidEnterBackground:(UIApplication *)application {
        NSLog(@"applicationDidEnterBackground = %@",[[NSUserDefaults standardUserDefaults] objectForKey:@"detail"]);
    }

    - (void)applicationWillEnterForeground:(UIApplication *)application {
        NSLog(@"applicationWillEnterForeground = %@",[[NSUserDefaults standardUserDefaults] objectForKey:@"detail"]);
    }
in my log its printing like this 

    applicationDidEnterBackground = (
            {
            image = img1;
            name = cat1;
        }
    applicationWillEnterForeground = (
            {
            image = img1;
            name = cat1;
        }

where I can retrieve store array after quit my app and again run with display categories which stored in array
thanks a lot for storing array but I can't retrieve that array after quit the app
in viewDidload method of RootViewController for retrieveing that array but array is not display in tableview
I am intialize my appDelegate.categories in appDelegate so any issue to retrieve that array please tell me

Ashley Mills · Accepted Answer · 2011-09-30 11:14:57Z

0

Perhaps something like this:

NSMutableArray * array = [NSMutableArray array];

appDelegate.categoryData = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                         categoryStr, @"name",
                                         image ,@"image", 
                                         array, @"array", nil];

answered Sep 30, 2011 at 11:14

Ashley Mills

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2 Comments

Ashley Mills Over a year ago

Can you be more specific? Do you mean you want to write the array to a file?

Nikunj Jadav Over a year ago

Ok I just store appDelegate.categories object & and quit the app and after that stored category is display in tableview

adam · Accepted Answer · 2011-09-30 11:28:37Z

Something like:

On Application launch:

[[NSUserDefaults standardUserDefaults] registerDefaults:
   [NSDictionary dictionaryWithObjectsAndKeys:
      [NSArray new], @"StoredArray", nil]];

In your class that "owns" control of the array:

- (void)setArray:(NSMutableArray *)array {
    [[NSUserDefaults standardUserDefaults] setObject:array forKey:@"StoredArray"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

- (NSArray*)array {
    return [[[NSUserDefaults standardUserDefaults] arrayForKey:@"StoredArray"] mutableCopy];
}

Hope this helps!

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