On 18 Nov 2010, at 12:35, Remco Poelstra wrote:
> Hi,
>
> I've a object like to following:
> @interface <Proto> {
> NSMutableArray *items;
> }
> @property (nonatomic,readonly) NSMutableArray *items;
> @end
>
> I also have a protocol as follows:
> @protocol Proto
> @property (nonatomic,readonly) NSArray *items;
> @end
>
> I of course want the items to be read only for the outside world, but the
> object itself should be able to modify it. Now the compiler complains about
> the properties not matching. How should I solve this? Make a custom getter
> that returns an immutable array? Make the property refer to a mutable array?
> Make the property an immutable array and make copies of the array while
> modifying it?
> Any insight would be appreciated.
>
Define a class extension (an unnamed category) within your implementation .m
file:
@interface <Proto> ()
@property (nonatomic. readwrite) NSMutableArray *items;
@end
Your object will have readwrite access.
See http://www.friday.com/bbum/2009/09/11/class-extensions-explained/
Regards
Jonathan Mitchell
Developer
Mugginsoft LLP
http://www.mugginsoft.com
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