Re: readonly property which is a mutable array
Re: readonly property which is a mutable array
- Subject: Re: readonly property which is a mutable array
- From: "email@hidden" <email@hidden>
- Date: Thu, 18 Nov 2010 13:20:35 +0000
On 18 Nov 2010, at 13:01, email@hidden 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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