Re: NSDictionaryController with NSTableView and sorting of numeric data
Re: NSDictionaryController with NSTableView and sorting of numeric data
- Subject: Re: NSDictionaryController with NSTableView and sorting of numeric data
- From: "Shawn Erickson" <email@hidden>
- Date: Thu, 15 May 2008 23:05:18 -0700
On Thu, May 15, 2008 at 10:43 PM, Kyle Sluder
<email@hidden> wrote:
> On Thu, May 15, 2008 at 5:30 PM, <email@hidden> wrote:
>> It would seem that NSDictionaryController keys have to be strings.
>
> Yes. It is very common that, despite NSDictionary accepting any
> object as a key, you must use NSString keys.
>
>> So the sorting of numeric string keys is always going to be alphabetic.
>
> Not true. See -[NSString compare:options:] with the NSNumericSearch option.
>
>> My solution was to discard NSDictionaryController and create a proxy object
>> containing two properties:
>
> I would instead suggest subclassing NSDictionaryController and
> overriding -arrangedObjects. The naive implementation would call
> super's implementation and return a sorted version of the result. The
> published interface says that -arrangedObjects returns id, but the
> documentation says that it returns an array, so I would feel
> reasonably safe treating the return value as an NSArray.
Consider using the built in sort facility...
<http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSArrayController_Class/Reference/Reference.html#//apple_ref/occ/instm/NSArrayController/setSortDescriptors:>
<http://developer.apple.com/documentation/Cocoa/Conceptual/SortDescriptors/Concepts/Creating.html>
-Shawn
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