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iOS Objective-C Basics (Retired) Foundation Framework NSDictionary

Posted by Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

I can't figure out whats wrong with my code.

Whats wrong with my code? I can't figuer it out.

[albumMutable setObject:@1969 setKey:@"year"];
NSLog(@"%@", albumMutable);

Here is the warning:

instance method '-setObject:setKey:' not found (return type defaults to 'id')
 [albumMutable setObject:@1969 setKey:@"year"];
               ^~~~~~~~~~~~~~~~~~~~~~
note: receiver is instance of class declared here
@interface NSMutableDictionary : NSDictionary
           ^
1 error generated.

8 Answers

Andres Oliva
Andres Oliva
7,810 Points

Ok, I know what's going on.

The challenge task reads: Let's add the year of the album to the 'albumMutable' variable. Where the key is a NSString 'year' and the value is also a NSString '1969'.

That means your code should be: 

[albumMutable setObject: @"1969" forKey: @"year"];

Not

[albumMutable setObject: @1969 forKey: @"year"];

I just tried it and it works.

KP Cluff
KP Cluff
2,344 Points
KP Cluff
KP Cluff
2,344 Points

What are you workng on?

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

The NSDictionary challenge, Foundation Framework badge, in the Objective-C Basics course; I'm on step 3.

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

If you need more code I can give it to you.

Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

That means that the method you're calling doesn't exist.

If I understand correctly, what you need is this:

[albumMutable setObject: @1969 forKey: @"year"];

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

Okay, I got it.

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

It said my answer was wrong: Bummer! The year set is not the correct value.

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

Got it! Thank you!