On 22 Sep, 2009, at 09:12, BareFeet wrote:
Hi all,
I have an NSArrayController and am trying to get an "add" button to
work, so that it inserts a new DataRow object at the current
selection, or at the end if no selection.
Here's my code:
- (IBAction) insertDataRow:(id)sender
{
DataRow* newDataRow = [[DataRow new] autorelease];
[newDataRow setTransactionPending:@"insert"]; // just a flag in the
DataRow object
NSUInteger controllerSelectionIndex = [dataRowsController
selectionIndex];
if (controllerSelectionIndex == NSNotFound)
{
[dataRowsController addObject:newDataRow];
}
else
{
[dataRowsController insertObject:newDataRow
atArrangedObjectIndex:controllerSelectionIndex];
}
}
When it gets to either the addObject or insertObject method, it
crashes with the error:
Program received signal: “EXC_BAD_ACCESS”
If I hook up an add button directly to the "insert" or "remove"
received action of the NSArrayController, it works fine. But I need
to run my own method so I can check and set other variables, such as
the setTransactionPending property shown above.
Can someone please tell me what I'm doing wrong?
Dave responded to that. I just thought I'd mention this (from 'Cocoa
Bindings Programming Topics')
"If the controller is in object mode, the method newObject is used to
create new objects. The default implementation simply allocates a new
object of the class specified by objectClass or theentityName and
sends the object a standard init message with no arguments. If your
content objects require more complex initialization, you can subclass
the appropriate controller class and override the newObject method."
--colin_______________________________________________
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