Re: “EXC_BAD_ACCESS” on Custom TableView with custom NSCell when clicking.
Re: “EXC_BAD_ACCESS” on Custom TableView with custom NSCell when clicking.
- Subject: Re: “EXC_BAD_ACCESS” on Custom TableView with custom NSCell when clicking.
- From: Ken Ferry <email@hidden>
- Date: Wed, 17 Feb 2010 15:29:06 -0800
On Wed, Feb 17, 2010 at 2:14 PM, Gustavo Pizano <email@hidden
> wrote:
>
> On Feb 17, 2010, at 11:03 PM, Jim Correia wrote:
>
> > On Feb 17, 2010, at 4:41 PM, Gustavo Pizano wrote:
> >
> >> Maybe I misunderstood I must conform NSCopying protocol also even when
> using core data?
> >
> > If you have an NSCell subclass which adds iVars, you must implement
> -copyWithZone: to do correct memory management.
> >
> > Your -copyWithZone: needs to work correctly within the bounds of the
> object ownership rules.
> >
> > If you have an object iVar which shouldn’t be copied, but is still an
> owned reference, then you can (and must) retain it instead in the copy.
> >
> > (You should do this for all cells with iVars, not just ones with object
> iVars, so that your subclass will behave correctly in the future even if
> NSCell doesn’t implement its behavior using NSCopyObject.)
> >
> > - Jim
>
> Hello Jim
> HMM digging more into the problem.. definitely it seems because Im not
> copying properly the NSManagedObject Paul Robinson says in one old post:
>
> "The short answer is that you need to override the setObjectValue: method
> (which tries to copy your uncopyable NSManagedObject) in your custom NSCell
> to convert your NSManagedObject into an NSValue (which is copyable)."
>
Overriding setObjectValue: to mess with the object is almost never right.
That sets you up for trouble when the framework use -objectValue vs goes
directly to the ivar.
You shouldn't take random weblog posts as necessarily correct.
-Ken
Cocoa Frameworks
>
>
> And taking what you said, so if my User ManagedObject returns me the
> NSDictionary with the key-value of its attributes, then in the cell I must
> set it as an ivar within the method setObjectValue, then implement the
> copyWithZone and return the copy of it isn't it? right now I don't have any
> ivar in my custom cell.. sooo . := :S.
>
> Gustavo
>
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