Re: Custom tableView cell by subclassing NSCell
Re: Custom tableView cell by subclassing NSCell
- Subject: Re: Custom tableView cell by subclassing NSCell
- From: Malayil George <email@hidden>
- Date: Tue, 5 May 2009 21:05:31 -0400
Interestingly changing the property type from copy as I had it to
retain @property
(retain) NSImage *image;
seems to have fixed the problem
Not entirely sure why tho. I would imagine that with copy, my cell would
be getting a copy of the image with a retain count of 1. When dealloced it
goes to 0. With retain, it should just be incrementing and decrementing the
retain count for my original image object.
George
On Tue, May 5, 2009 at 8:48 PM, Malayil George <email@hidden> wrote:
> just found
> http://developer.apple.com/samplecode/ImageBackground/listing3.html after
> posting this...going through it to see if I can figure it out :-)
>
>
> On Tue, May 5, 2009 at 8:41 PM, Malayil George <email@hidden> wrote:
>
>> Hi, I'm trying to expand on "Styling an NSTableView" at katidev.com in
>> a test app of mine. The modification that I have made is that in my subclass
>> of NSCell, I have included a new NSImage data element
>>
>> @interface CustomCell : NSCell {
>>
>> NSImage *image;
>>
>> }
>>
>> @end
>>
>> In my appController, I set the tableView to use this cell
>>
>> CustomCell *cell = [[CustomCell alloc] init];
>>
>> [[tableView tableColumnWithIdentifier:@"Cities"] setDataCell:cell];
>>
>> [cell release];
>>
>>
>> and I set the image for the cell in my implementation of
>>
>>
>> -(void) tableView:(NSTableView*) aTableView
>>
>> willDisplayCell:(id) aCell
>>
>> forTableColumn:(NSTableColumn *) aTableColumn
>>
>> row:(int) rowIndex
>>
>>
>> When I run the program, it displays the image fine. However, when I click
>> on the table row's it crashes. I see that it is deallocing my cell (via an
>> NSLog()) in the CustomCell's dealloc method. So, I guess it is crashing as
>> the cell is being dealloced, and then in willDisplayCell, it is trying to
>> set the image.
>>
>>
>> I tried setting aCell in the willDisplayCell method to a newly allocated
>> instance of CustomCell and also tried doing the setDataCell method with that
>> new instance. It still crashes...should I be initializing the cell someplace
>> else?
>>
>> Reading the documentation it seems that a single cell is used for all rows
>> of the table Column. So, I'm guessing when the application launches it is
>> using my initialized customCell for all rows and displaying it without
>> deallocing it. However, when I click a row, it deallocs and tries to do the
>> same again.
>>
>> Any pointers on if and when I should be giving the tableView a newly
>> allocated instance of the cell? Thanks
>>
>>
>>
>> George
>>
>>
>>
>
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