Re: Subclassing NSMutableDictionary
Re: Subclassing NSMutableDictionary
- Subject: Re: Subclassing NSMutableDictionary
- From: "I. Savant" <email@hidden>
- Date: Tue, 29 Nov 2005 13:13:23 -0500
David:
This seems an awfully strange way of doing things. How about in
your controller class defining a method like so:
- (NSMutableDictionary *)preloadedDictionaryWithChildren:(id)children
... and creating / populating / returning the dictionary from
there. It just doesn't strike me as a good idea to subclass a basic
container just to get a preloaded instance of that container.
--
I.S.
On Nov 29, 2005, at 12:59 PM, David Alter wrote:
I'm sure I'm missing something basic here but it is not hitting me.
I want to subclass NSMutableDictionary. My init method wants to
populate this dictionary with some data. But my sub class does not
like it when I do this.
Here is the runtime error I'm getting. It does not make sense to
me. I thought the point of subclassing was so I did not need to
recreate methods that are in the super class. That appears to be
what it is telling me to do.
2005-11-29 09:09:30.800 SubclassDict[2506] An uncaught exception
was raised
2005-11-29 09:09:30.801 SubclassDict[2506] *** -setObject:forKey:
only defined for abstract class. Define -[MyDictionary
setObject:forKey:]!
2005-11-29 09:09:30.801 SubclassDict[2506] *** Uncaught exception:
<NSInvalidArgumentException> *** -setObject:forKey: only defined
for abstract class. Define -[MyDictionary setObject:forKey:]!
Here is the code
// *************************** MyDictionary.m file
*************************************
#import "MyDictionary.h"
@implementation MyDictionary
- (id)init
{
[super init];
NSMutableArray * children = [[NSMutableArray alloc] init];
[super setObject:children forKey:@"children"]; // I also tried
doing this using "self" and not "super". It resulted in the same error
return self;
}
@end
// *************************** MyDictionary.h file
*************************************
#import <Cocoa/Cocoa.h>
@interface MyDictionary : NSMutableDictionary {
}
- (id) init;
@end
Thanks in advance for the help.
enjoy
-dave
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