Re: [Q] CopyWithZone:error
Re: [Q] CopyWithZone:error
- Subject: Re: [Q] CopyWithZone:error
- From: Bill Cheeseman <email@hidden>
- Date: Fri, 30 Aug 2002 16:36:51 -0400
on 02-08-30 3:06 PM, Mark de Jong at email@hidden wrote:
>
I changed something in my code, not sure what <sheepish grin>, but now
>
I'm getting the following runtime errors:
>
>
*** -[MyObject copyWithZone:]: selector not recognized
>
An uncaught exception was raised
<snip>
>
What I need are some clues as to how to debug this. When I step through
>
it, the stack trace includes:
>
>
0 -[NSException raise]
>
1 +[NSException raise:format:]
>
2 -[NSObject(NSForwardInvocation) forward::]
>
3 _objc_msgForward
>
4 -[NSCell _setContents]
>
5 -[NSCell setObjectValue:]
I could use some clues about how to debug this sort of problem, too.
I see that, directly or indirectly, your exception comes while sending the
[NSCell setObjectValue:] method. The object you are trying to put into the
cell (or into the table or outline) must conform to the NSCopying protocol.
If MyObject is a custom object that inherits from NSObject (which does not
conform to the NSCopying protocol), you must add the necessary method,
copyWithZone:, to MyObject to make it conform to the NSCopying protocol.
This is demonstrated by this excerpt from the NSCell class documentation:
- (void)setObjectValue:(id <NSCopying>)object
--
Bill Cheeseman - email@hidden
Quechee Software, Quechee, Vermont, USA
http://www.quecheesoftware.com
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