> On May 10, 2010, at 9:12 AM, Trygve Inda wrote:
>
>> I have an NSArrayController containing items and a text field in a window
>> which is bound to a custom class "MyController" via model key path:
>> filteredResultsString
>>
>>
>> -(NSString *)filteredResultsString
>> {
>> return ([[NSNumber numberWithInt:[[itemsController arrangedObjects] count]]
>> stringValue]);
>> }
>>
>>
>> This works, except when the contents of the NSArrayController change it does
>> not update.
>>
>> If I change the binding to controller key arrngedObjects model key path
>> @count it works perfectly, but I want to use my custom method to customize
>> the output in a way that a Display Pattern can't.
>>
>> How do I get this to work?
>
> Maybe your keyPathsForValuesAffectingValueForKey is wrong. Can't say, since
> you don't show us what it is, nor anything else useful to help you in any way.
>
> Keary Suska
> Esoteritech, Inc.
> "Demystifying technology for your home or business"
>
The key is question is/was: filteredResultsString
I moved things around to instead use:
[self addObserver:self forKeyPath:@"itemsController.arrangedObjects.count"
options:NSKeyValueObservingOptionNew context:NULL];
and
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context
{
// set the NSTextField
}
This seems to work fine.
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