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Re: Key-Value Coding Limitations
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Re: Key-Value Coding Limitations


  • Subject: Re: Key-Value Coding Limitations
  • From: Graham J Lee <email@hidden>
  • Date: Fri, 12 May 2006 11:38:07 +0100

On 6 May 2006, at 02:36, Jonathon Mah wrote:

Hi Mike and James,

On 2006-05-06, at 02:07, Mike Abdullah wrote:

Besides, you really ought to be using accessor methods, rather than directly editing the object in any case.

Yes, I know. I was a bit unclear in my original e-mail; this is for a plug-in to an existing application. The plug-in poses a couple of classes over the application, and these posing subclasses require access to some instance variables of their superclasses that don't have accessors. So I can change the plug-in code, but no the application code (i.e. I can't add accessor methods).

It breaks encapsulation (i.e. it *does* count as directly accessing the ivars), but this could be a job for @defs:


#import <Foundation/Foundation.h>

@interface GLWibble:NSObject
{
	int x;
	double y;
}
@end

@implementation GLWibble
-(id)init {
	if(self=[super init]) {
		y=3.0;
		x=1;
	}
	return self;
}
@end

typedef struct { @defs(GLWibble) } *CGLWibbleRef;

int main (int argc, const char * argv[]) {
	GLWibble *myWibble=[GLWibble new];
	CGLWibbleRef coreWibble=(CGLWibbleRef) myWibble;
	printf("x:\t%d\ny:\t%g\n\n",coreWibble->x,coreWibble->y);
    return 0;
}

Cheers,

Graham.
--
Graham J Lee
"Oxford University's UNIX Expert"
As seen in MacWorld UK
http://iamleeg.blogspot.com


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      • From: Jonathon Mah <email@hidden>
References: 
 >Re: Key-Value Coding Limitations (From: James Bucanek <email@hidden>)
 >Re: Key-Value Coding Limitations (From: Mike Abdullah <email@hidden>)
 >Re: Key-Value Coding Limitations (From: Jonathon Mah <email@hidden>)

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