On 18 Nov 2010, at 13:01, jonat...@mugginsoft.com wrote:
>
> 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
Sorry. Wrong answer. Didn't read the question properly.
Don't make items a property if you don't want to advertise it to the outside
world.
I would have a custom getter called items which returns [items copy].
When you modify items raise manual KVO notifications to inform observers of
your changes.
Jonathan_______________________________________________
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