On Jun 28, 2012, at 1:16 PM, Robert Tillyard wrote:
> Hello, Keary,
>
> Thank you for your reply.
>
> Would the selector in the model be in the class for the CoreData Entity or os
> it in the WindowController sub-class that controls the window that the
> TableView is in?
>
> Would you know what the method for the selector would look like? I'm guessing
> it must return an NSComparisionResult but if the entries in the ListView are
> Entry classes would it be:
>
> - (NSComparisonResult)positionCompare:(Entry *)obj1 somethingElse:(Entry
> *)obj2;
I forgot about that piece--yes, you will need to implement an
NSEntityDescription subclass for the sort method. If that proves to be
problematic, you can fall back to binding/delegate that you can implement in
your window controller.
> On 28 Jun 2012, at 19:38, Keary Suska wrote:
>
>> On Jun 28, 2012, at 9:44 AM, Robert Tillyard wrote:
>>
>>> Hello,
>>>
>>> I'm writing an application that handles results for a running club.
>>>
>>> I have an NSTableView that has columns bound to a CoreData Entity such as
>>> Entries.arrangedObjects.position, position is an NSString that contains
>>> numbers such as @"1" and @"2" or @"" but the position can also be @"DNF"
>>> (Did not finish).
>>>
>>> I have a method in the WindowController that sorts the 'Entry' objects and
>>> handles these cases correctly returning an NSArray using:
>>>
>>> [array sortUsingComparator:^(id obj1, id obj2)
>>> {
>>> NSComparisonResult r;
>>>
>>> r = ....
>>>
>>> return (r);
>>> }];
>>>
>>> How can I get my table view to work so that when the user clicks in the
>>> Pos. column I can do my custom sort? at present it is doing an ASCII sort
>>> so I get 1, 10, 100, then 2, 20, 200 etc...
>>>
>>> I now I need to put a key and sort descriptor in IB but don't know what
>>> code I have to add to the Entity ot WindowController to handle it.
>>
>>
>> Although there may be better ways, the easiest way is to specify the
>> per-column sort in IB, and use the "selector" method for the position
>> column. You would need to implement a sort method in your model, of course.
>> Alternatively you could use the NSTableView delegate method
>> tableView:sortDescriptorsDidChange:. You could use the latter in conjunction
>> with the sortDescriptors binding in the array controller.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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