Re: NSDictionary allValues not mutable
Re: NSDictionary allValues not mutable
- Subject: Re: NSDictionary allValues not mutable
- From: Trygve Inda <email@hidden>
- Date: Mon, 18 Oct 2010 18:45:10 +0000
- Thread-topic: NSDictionary allValues not mutable
> On Oct 18, 2010, at 10:59 AM, Trygve Inda wrote:
>
>> I guess I am just not seeing how my NSArrayController would ties to this. So
>> I have a class MyDataClass and since my NSTableView is tied to an
>> NSArrayController, then the NSArrayController needs to get it's data from
>> MyDataClass.
>>
>> So is there then a myArray property in MyDataClass that the
>> NSArrayController binds to?
>>
>> Or does NSArrayController somehow bind to a non-array property, but one
>> that responds as if it were an array?
>
> A property implemented in terms of the indexed accessor methods is appropriate
> for binding an NSArrayController's contentArray to. And, if you must think of
> properties as "array" vs "non-array", then such a property is an array
> property. It is more precisely called an indexed to-many relationship or an
> indexed collection. (In particular, there's no reason to expect an NSArray*
> to be part of its interface.)
>
> Regards,
> Ken
So would you do something like the example you described:
http://homepage.mac.com/mmalc/CocoaExamples/controllers.html
Where the NSArrayController is bound not to an array at all but to a
property which responds to the proper indexed to-many messages...
Or a subclass of NSMutableArray as Greg suggested?
My array will rarely be edited (but needs to be mutable), but needs to be
searchable by key (for which instead of a keyed dictionary kept in tandem
with the array, I could just use a predicate filter on the array).
Each dictionary (or object with properties) will need to hold roughly 9
textual strings, and there will be on the order of 10,000 objects in the
array. I am guessing that dictionary will perform better than a predicate
filter given the number of objects.
Trygve
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