CODEWITHSUNDEEP
iosnsmutablearray
iOS dev
iOS dev

Reputation: 45

how to save an NSMutableArray to local storage

I want to save an NSMutableArray to a file and load it every time my program runs. What is the best solution for this?

This is my example:

// I add a new item to ARRAYLIST
NSString *textNewCategory = [alert textFieldAtIndex:0].text;
[ARRAYLIST insertObject:textNewCategory atIndex:0];

// I save ARRAYLIST
userCategory = [NSUserDefaults standardUserDefaults];
[userCategory setObject:ARRAYLIST forKey:@"newCategory"];
NSLog(@"ARRAYLIST 1:%d", ARRAYLIST.count); // EX: In this case, it has count : 30

//In viewdidload, I get array that I saved before 
userCategory = [NSUserDefaults standardUserDefaults];
arrayNewCategory = [[NSMutableArray alloc] initWithArray: [userCategory objectForKey:@"newCategory"]];
ARRAYLIST = arrayNewCategory;
NSLog(@"ARRAYLIST 2:%d", ARRAYLIST.count); // In this moment, it only has count: 29.

I don't understand why the re-loaded array has only 29 items instead of the 30 that I expect.

Upvotes: 0

Views: 286

Answers (1)

rounak
rounak

Reputation: 9387

Save the array to a plist:

[array writeToFile:path atomically:NO]

and retrieve it:

NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];

Upvotes: 1

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