NSDictionary objectForKey is returning nil value

Question

I have a dictionary like this

123456
{
   "aaa"
   "aaav"
}

But when i try to get these values in NSArray using objectForKey, I am getting nil.

The key I am using is a string.

Code :

NSArray *arr = [userdetails objectForKey:str]

Where userdetails is an NSDictionary and str is NSString which contains the key.

Answer 1

NSDictionary cannot contain nil objects. There are two possibilities to get a nil back from objectForKey:

• Your dictionary itself has not been initialized, or
• There is no object for the key that you have specified.

Please make sure that you have created an instance of your NSDictionary or a compatible class (say, NSMutableDictionary) and assign it to the variable prior to querying it for the key. Then make sure the key in question contains an object.