iOS NSMutableDictionary Remains Null After Entry Added

[zachsilvey]

NSLog(@"%@", book);
NSLog(@"%@", [completeBooksDictionary objectForKey:book]);
[selectedBooksDictionary setObject:[completeBooksDictionary objectForKey:book] forKey:book];

So the first two line demonstrate that those messages do in fact return objects (the first a string constant and the second a dictionary).

Why is that when I use the third line to add the key-value pair it doesn't work?

If I add the entry then use

NSLog(@"%@", selectedBooksDictionary);

I get Null

 

[ulbador]

Did you ever do the alloc and init on the

selectedBooksDictionary

?

 

[zachsilvey]

I synthesized one via a property.

 

[dejo]

I synthesized one via a property.

That doesn't necessarily allocate it, though.

 

[ulbador]

That doesn't necessarily allocate it, though.

At some point you have to call something like:

NSMutableDictionary *selectedBooksDictionary = [[NSMutableDictionary alloc] init];

Or something like that.