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Programmatically replace bound objects
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Programmatically replace bound objects


  • Subject: Programmatically replace bound objects
  • From: Claudio Procida <email@hidden>
  • Date: Fri, 18 Aug 2006 01:00:00 +0200

Hi,

I have a NSPopupButton whose content is bound to a NSArray member of a controller object. The binding has been set through IB.

Now I'm trying to replace the array programmatically, but something goes wrong, as I get an EXC_BAD_ACCESS error.
I do understand that it's an issue related to Key-Value observing, but I haven't a clue on how to solve this.


I've come up with this so far:

- (IBAction) updateDay:(id)sender
{
	// dayMenu is the NSPopup

	// Save the action
	SEL action = [dayMenu action];
	// Save the title to use it later
	NSString *title = [dayMenu titleOfSelectedItem];
	// Remove the action
	[dayMenu setAction:NULL];
	// Remove the target
	[dayMenu setTarget:nil];

	// Replace the array
	[self setDays:[NSArray arrayWithObjects:@"1", @"2", nil]];

	// Remove the binding
	[dayMenu unbind:@"content"];
	// Set the binding again
	[dayMenu bind:@"content"
		 toObject:self
	  withKeyPath:@"days"
		  options:nil];
	// Select previously selected item
	[dayMenu selectItemWithTitle:title];
	// Reconnect action...
	[dayMenu setAction:action];
	// and target
	[dayMenu setTarget:self];
}

What should be the correct way to do this?

Thanks in advance.

Claudio
--
http://www.emeraldion.it
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