Re: problem observing selectionIndex of an array controller
Re: problem observing selectionIndex of an array controller
- Subject: Re: problem observing selectionIndex of an array controller
- From: Stuart Malin <email@hidden>
- Date: Sat, 7 Mar 2009 22:34:31 -1000
On Mar 7, 2009, at 10:10 PM, Ken Thomases wrote:
On Mar 8, 2009, at 1:52 AM, Stuart Malin wrote:
I'm trying to watch for changes in the selection of a tableView
managed by an NSArrayController. I set up an observer:
[mArrayController addObserver:self
forKeyPath:@"selectionIndex"
options:NSKeyValueObservingOptionOld | NSKeyValueObservingOptionNew
context:NULL];
When the -observedValueForKeyPath:... method is invoked, the change
dictionary has entries for the new and old value, but they are both
NSNull.
According to the NSArrayController docs, the selectionIndex is an
observable property. Why might I not be getting the index values?
Known bug. Search for "(Missing) KVO notification old and new
values" at this page: http://homepage.mac.com/mmalc/CocoaExamples/controllers.html
"This bug will not be fixed in the forseeable future."
You'll have to query the property for the new value and keep track
of any old value yourself.
Yes I will.
Regards,
Ken
Thanks for the quick reply.
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