KVO Code Breaks Undo
KVO Code Breaks Undo
- Subject: KVO Code Breaks Undo
- From: Richard Somers <email@hidden>
- Date: Sat, 28 Mar 2009 06:33:29 -0600
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];
}
Any ideas as to why undo stopped working?
Richard
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