Re: KVO Code Breaks Undo
Re: KVO Code Breaks Undo
- Subject: Re: KVO Code Breaks Undo
- From: Tommy Nordgren <email@hidden>
- Date: Sat, 28 Mar 2009 16:15:43 +0100
On Mar 28, 2009, at 1:33 PM, Richard Somers wrote:
I have core data document based application with a custom opengl
layer-hosting view. Everything works except when objects are added
or removed from the managed object model the view is not redrawn. So
I add the following to code to redraw the view but then automatic
undo is broken.
// Receive KVO change notifications if objects are added to or removed
// from the array so we can redraw the display. !!!: Breaks undo!
- (void)awakeFromNib
{
[observableController addObserver:self
forKeyPath:@"arrangedObjects" options:NSKeyValueObservingOptionNew
context:NULL];
}
// Respond to KVO change notifications. !!!: Breaks undo!
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:
(id)object change:(NSDictionary *)change context:(void *)context
{
[graphicsLayer setNeedsDisplay];
You need to invoke base class method; Otherwise the standard
behaviour won't be used.
}
Any ideas as to why undo stopped working?
Richard
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Tommy Nordgren
email@hidden
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