Re: NSArrayController array-observation
Re: NSArrayController array-observation
- Subject: Re: NSArrayController array-observation
- From: Scott Anguish <email@hidden>
- Date: Sun, 23 Nov 2003 15:30:20 -0500
On Nov 23, 2003, at 2:05 PM, Dominik Wagner wrote:
Hi List!
here is the setup: I want to have a tableview with a String and a
Checkbox. All this is handled by a NSArrayController. Now I want to
know when the Checkboxes are clicked on and take an apropriate action.
For this action I need to know the string in the same row.
How do I do this?
My first thought was KeyValueObserving on the Model, so to say the
NSNumber that represents the bool with something like this:
[self addObserver:self forKeyPath:@"myArray.myBool"
options:(NSKeyValueObservingOptionNew |
NSKeyValueObservingOptionOld)
context:nil];
But a KeyPath like this is not allowed. Is there any Keypath for a
tomany relationship that works in this context? The "Array Operators"
don't work here. Observing only the array does not help either,
because then I do not get informed, when mutable content is changing.
Basically it's: How do I observe the contents of an Array?
You can only observe the contents of an array by registering as an
observer on each item in the array. Yes, not the best solution for
you're situation.
You could implement a set method for myBool that posts a notification
when the value changes. Not necessarily a good solution in all cases
though. Another option might be to make a second accessor with a
slightly different naming scheme (myBoolinIB) that then posted
whatever the change was.
What is the appropriate action?
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