CODEWITHSUNDEEP
objective-cnsmutabledictionary
Rinju Jain
Rinju Jain

Reputation: 1694

Update nsmutableDictionary insert a new key

i have a nsmutabeldictionary like this

   {
        alert = "test from dot net";
        badge = 1;
        sound = default;
    }

and want to a key 'ID' with value 10 just like 

     {
        alert = "test from dot net";
        badge = 1;
        sound = default;
        ID  = 10;
    }

please help

Upvotes: 0

Views: 433

Answers (3)

James Webster
James Webster

Reputation: 32066

From your comment:

'NSUnknownKeyException', reason: '[<__NSDictionaryI 0x1ede8740> setValue:forUndefinedKey:]:

It looks as if you actually have an immutable dictionary (note the I suffix).

I imagine your code looks like this:

//Even though you are assigning to a mutable object
//The method may not return an mutable dictionary
NSMutableDictionary *d = [someObject getDictionary];

You should instead use:

NSMutableDictionary *d = [NSMutableDictionary dictionaryWithDictionary:[someObject getDictionary]];

Then you can comfortably use:

[d setObject:@10 forKey:@"ID"];

Upvotes: 1

user1113101
user1113101

Reputation: 955

To add new object with new Key to Dictionary, you can use SetObject:forKey Method.

Upvotes: 0

Daniel Kl&#246;ck
Daniel Kl&#246;ck

Reputation: 21147

You just have to call the setObject:forKey

Adds a given key-value pair to the dictionary.

- (void)setObject:(id)anObject forKey:(id < NSCopying >)aKey

Parameters

anObject

The value for aKey. A strong reference to the object is maintained by the dictionary. Raises an NSInvalidArgumentException if anObject is nil. If you need to represent a nil value in the dictionary, use NSNull.

aKey

The key for value. The key is copied (using copyWithZone:; keys must conform to the NSCopying protocol). Raises an NSInvalidArgumentException if aKey is nil. If aKey already exists in the dictionary anObject takes its place.

In your example you can call it like this:

[yourMutableDictionary setObject:[NSNumberWithInt:10] forKey:@"ID"]

also, remember that you have to pass an NSObject. So you should use [NSNumberWithInt:10] instead of just 10.

Upvotes: 1

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