RE: In dealloc(): ref @property, Can I use "<property object> = nil; " vs "[<property object> release]; " ?
RE: In dealloc(): ref @property, Can I use "<property object> = nil; " vs "[<property object> release]; " ?
- Subject: RE: In dealloc(): ref @property, Can I use "<property object> = nil; " vs "[<property object> release]; " ?
- From: "Lee, Frederick" <email@hidden>
- Date: Wed, 8 Oct 2008 12:58:07 -0400
- Thread-topic: In dealloc(): ref @property, Can I use "<property object> = nil; " vs "[<property object> release]; " ?
Thank you.
I'm understand.
Shall remedy.
Ric.
-----Original Message-----
From: mmalc crawford [mailto:email@hidden]
Sent: Wednesday, October 08, 2008 11:56 AM
To: Lee, Frederick
Cc: email@hidden
Subject: Re: In dealloc(): ref @property, Can I use "<property object> =
nil; " vs "[<property object> release]; " ?
On Oct 8, 2008, at 9:41 AM, Lee, Frederick wrote:
> So all my iVars are accessed via:
> @property(nonatomic, retain) iVar; // array, dictionary, etc. <--
> collections & objects.
> Also, I'm not subclassing these properties.
> I've seen examples of releasing the iVars & setting their pointers to
> nil.
> So I figure, using the self.iVar = nil;
>
No, that is not Apple-sanctioned best-practice.
> So you say:
> 1) use the [iVar release] directly; yet
> 2) use the "self.iVar = nil" approach for 'synthesized instance
> variables.'
>
Yes, for synthesized *instance variables*.
> So if I understand correctly, what you're saying is that in my
> particular circumstance (nonatomic),
>
'nonatomic' has nothing to do with it.
> (and I'm synthesizing collections, strings & objects)
> the preferred way is setting the 'self.iVar' to nil; per your example
> below.
> Correct?
>
No. I stated specifically "synthesized *instance variables*" and gave
an example:
@interface MyClass : NSObject
{} // **** Note: no instance variables
@property (retain) NSString *aString;
@end
@implementation MyClass
@synthesize aString;
-(void)dealloc {
self.aString = nil; // [aString release]; won't work
}
@end
If instead you had an explicit instance variable:
@interface MyClass : NSObject {
NSString *aString;
}
@property (retain) NSString *aString;
@end
then you would use:
@implementation MyClass
@synthesize aString;
-(void)dealloc {
[aString release];
}
@end
mmalc
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