insert an object to an NSMutablearray of NSDictionary

Question

I am trying to insert an object to an array of NSDictionary but cant find out how. all the examples show how to insert to an array with NSDictionary with insertObject:atIndex, but this one doesnt insert the object under a dictionary key.

My array right now is the following:

NSArray *aaa = [NSArray arrayWithObjects:@"Disable" ,nil];
NSDictionary *aaaDict = [NSDictionary dictionaryWithObject:aaa forKey:@"Computers"];
NSArray *bbb = [NSArray arrayWithObjects:@"Enable", nil];
NSDictionary *bbbDict = [NSDictionary dictionaryWithObject:bbb forKey:@"Computers"];
NSArray *ccc = [NSArray arrayWithObjects:@"Enable", nil];
NSDictionary *cccDict = [NSDictionary dictionaryWithObject:ccc forKey:@"Computers"];

[listOfItems addObject:aaaDict];
[listOfItems addObject:bbbDict];
[listOfItems addObject:cccDict];

I would like to do this, but with a key "Computers":

   NSArray *ar = [NSArray arrayWithObjects:@"xxxx", @"yyyy", @"zzzz", nil];
    NSDictionary *arDict = [NSDictionary dictionaryWithObject:ar forKey:@"Computers"];
    [listOfItems insertObject:ar atIndex:1];

Again - it does add the new array but not under the key "Computers". What am I missing here?

Thanks!

What do you mean? What's not working? listOfItems, which is presumably an NSArray, doesn't have any concept of keys (it's not a dictionary). — Adam Rosenfield
– Adam Rosenfield, Commented Aug 4, 2011 at 19:46

Jacob Gorban · Accepted Answer · 2011-08-04 19:49:11Z

3

You probably wanted to write
[listOfItems insertObject:arDict atIndex:1];
instead of
[listOfItems insertObject:ar atIndex:1];

You're adding the array and not the dictionary like in the first part of your question.

answered Aug 4, 2011 at 19:49

Jacob Gorban

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sbooth · Accepted Answer · 2011-08-04 19:48:39Z

1

I'm not sure I understand exactly what you're trying to do, but did you mean to insert the ar object or the arDict object? I think your code should look like

NSArray *ar = [NSArray arrayWithObjects:@"xxxx", @"yyyy", @"zzzz", nil];
NSDictionary *arDict = [NSDictionary dictionaryWithObject:ar forKey:@"Computers"];
[listOfItems insertObject:arDict atIndex:1];

answered Aug 4, 2011 at 19:48

sbooth

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alexcash · Accepted Answer · 2011-08-04 19:57:57Z

1

Do you mean you want to add another array to a dictionary inside your listOfItems array? If that is the case it requires a nested method call as such:

[[listOfItems objectAtIndex:0] setObject:ar forKey:@"Computers"];

edited Aug 4, 2011 at 19:57

answered Aug 4, 2011 at 19:52

alexcash

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Praveen S · Accepted Answer · 2011-08-04 19:50:39Z

When it adds the new object you have to get the NSDictionary first. So basically you are using the dictionary wrong. What you have done is equivalent to

[listOfItems addObject:aaa]; and similarly bbb and ccc and ar

What you actually want to do is add the objects to a Dictionary and not a array.

NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary addObject:[NSArray arrayWithObjects:@"Disable" ,nil] forKey:@"Key1"]; // your keys need to be unique
[dictionary addObject:[NSArray arrayWithObjects:@"Enable", nil] forKey:@"Key2"];
[dictionary addObject:[NSArray arrayWithObjects:@"Enable", nil] forKey:@"Key3"];

[dictionary addObject:[NSArray arrayWithObjects:@"xxxx", @"yyyy", @"zzzz", nil] forKey:@"Key4"];

Praveen-K · Accepted Answer · 2011-08-04 20:29:32Z

0

With leak fixed issue

NSArray *ar = [NSArray arrayWithObjects:@"xxxx", @"yyyy", @"zzzz", nil];
NSDictionary *arDict = [NSDictionary dictionaryWithObject:ar forKey:@"Computers"];
[listOfItems insertObject:arDict atIndex:1];
[ar release]; // fixed the leak
[arDict release];  // fixed the leak

answered Aug 4, 2011 at 20:29

Praveen-K

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