Re: Using a Core Data relationship binded to an NSTokenField

FROM : Orestis Markou
DATE : Sun Jun 15 23:01:55 2008

Hi,

after some experimentation, I have this Obj-C class that tries to do 
the minimal thing:

@implementation OMSetToArrayValueTransformerOBJC

+ (Class) transformedValueClass
{
    return [NSMutableArray class];
}

+ (BOOL) allowsReverseTransformation
{
    return YES;
}

- (id) transformedValue:(id) value
{
    NSLog(@"FORWARD");
    return [value allObjects];
}

- (id) reverseTransformedValue:(id) value
{
    NSLog(@"REVERSE");
    return [NSSet setWithArray:value];
}

Using this, I can edit my token field (delegate methods still not 
called), but of course after completing the edit everything is gone, 
most probably because nothing is inserted into the Data Store, since 
the delegate methods are not called.

I've tried a minimal project to use a plain NSTokenField, without the 
table view, and it works fine.

Perhaps I'm doing something wrong in how I setup the NSTokenFieldCell? 
What I did was create a plain column, and specify the Text Field Cell 
class to be an NSTokenFieldCell, since there's no option of dragging 
and dropping something from the Library.

Any minimal example of an NSTokenFieldCell working in an NSTableView 
would be enough to get me started, but unfortunately I can't find 
anything...

Regards,
--
Orestis Markou
<email_removed>
http://orestis.gr/




On 09 Ιουν 2008, at 5:40 ΜΜ, Charles Srstka wrote:

> On Jun 9, 2008, at 4:08 AM, Orestis Markou wrote:
>

>> If I have allowReverseTransformedValue set to YES, then double 
>> clicking the
>> row will not show the NSTokenField. The reverseTransformedValue 
>> isn't called
>> at all.

>
> Do any exceptions or other errors get logged to the console?
>
> Charles