Re: @property problem

FROM : Joshua Emmons
DATE : Mon Feb 11 22:29:03 2008

> I've boiled the problem down to this snippet:
>
> @interface MyWindow : NSWindow
> {
> }
> @property(readwrite) BOOL    capturing;

...
> error: synthesized property 'capturing' must either be named the 
> same as a compatible ivar or must explicitly name an ivar


You haven't declared a compatible ivar named "capturing". You'd need 
to do something like this:

@interface MyWindow : NSWindow
{
   BOOL capturing;  // <-- here!
}
@property(readwrite) BOOL    capturing;

The line marked above declared an ivar with the same name and the same 
type as your property declaration, so now synthesize will be able to 
do its thing.

Obj-C *can* be smart enough to generate this ivar for you behind the 
scenes, but only if you're using the 64bit runtime. If you don't 
require 32bit compatibility, turn it off, and then you don't have to 
worry about declaring these ivars for synthesize.


Cheers,
-Joshua Emmons