CODEWITHSUNDEEP
iosnsmutabledictionary
ManOx
ManOx

Reputation: 1965

How can I change the key of an existing object in a NSMutableDictionary?

How can I change the key of an existing object in a NSMutableDictionary?

Upvotes: 2

Views: 1621

Answers (1)

mttrb
mttrb

Reputation: 8345

You will have to remove the object from the original key and add it back with the new key. You could turn this into a category on NSMutableDictionary.

The category would look something like this:

@interface NSMutableDictionary (RenameKey)

- (void)renameKey:(NSString *)original to:(NSString *)new;

@end

@implementation NSMutableDictionary (RenameKey)

- (void)renameKey:(id)original to:(id)new; {
    id value = [self objectForKey:original];
    [self removeObjectForKey:original];
    [self setObject:value forKey:new];}
@end

You should probably add a pre/postfix to the method name to avoid future name conflicts in the runtime. The above is also not thread-safe, it takes three steps to perform the rename.

Upvotes: 3

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