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Re: Increment object property
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Re: Increment object property


  • Subject: Re: Increment object property
  • From: Keary Suska <email@hidden>
  • Date: Wed, 22 Oct 2008 14:19:38 -0600
  • Resent-date: Wed, 22 Oct 2008 14:20:13 -0600
  • Resent-from: Keary Suska <email@hidden>
  • Resent-message-id: <email@hidden>
  • Resent-to: "Cocoa-Dev (Apple)" <email@hidden>


On Oct 22, 2008, at 2:10 PM, email@hidden wrote:

Newbie question, Is it possible to have an object property that increments everytime an object is instantiated?

You can have a static variable defined in the implementation file, and it will be persistent across the class, but will be invisible to subclasses, which is a drawback. Or you could have a class method with a static stack var. You could have a global var.


@interface foo : NSObject {
	NSString	*name;
}
@property (copy,readwrite) NSString *name;
@end

#import "foo.h"
@implementation foo
- (id) init {
	self = [super init];
	if (self != nil) {
		[self setName:@"untitled1"];
	}
	return self;
}
@synthesize name;
@end

I have an NSTableColumn that is bound to foo.name. An NSArrayController looks after adding and removing the foo objects.
How can I make the name property increment from untitled1, untitled2, untitled3... etc as the objects are added to the array?

Perhaps also have an initWithName: method, and subclassing the nsarraycontroller so you have control over object creation, then you could use [NSString stringWithFormat:@"untitled%i", [[self arrangedObjects] count]].


HTH,

Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"

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 >Increment object property (From: email@hidden)

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