On Aug 10, 2012, at 5:07 AM, Koen van der Drift wrote:
>
> On Aug 9, 2012, at 10:47 AM, Ken Thomases <k...@codeweavers.com> wrote:
>
>> Better would be to create a property on your controller which returns the
>> predicate, constructing it on demand for each call (perhaps with some smart
>> caching). (I'll call the property "minMaxPredicate" for discussion.) Bind
>> the array controller's filterPredicate binding to that property on your
>> controller. Then, arrange for KVO change notifications to be emitted for
>> the property when the minimum and maximum value properties change. The
>> easiest way to do this is to add a method like the following to your class:
>>
>> + (NSSet *) keyPathsForValuesAffectingMinMaxPredicate
>> {
>> return [NSSet setWithObjects:@"minimumValue", @"maximumValue", nil];
>> }
>
>
> Thanks Ken. I implemented this all, but are having some trouble with the
> correct syntax for the predicate I'll use for this:
>
> I added this to my Controller loadview method:
>
> self.minMaxPredicate = [NSPredicate predicateWithFormat:@"%f < value <
> %f", self.minValue, self.maxValue];
>
> Where the float "value" is a property of the entity that I am displaying in
> the table and self.minValue and self.maxValue are floats bound to my
> NSTextFields.
>
> But no matter what I try, I get an error "Unable to parse the format string".
>
>
>
> Any suggestions?
Where in the predicate formatting guide
(https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Predicates/predicates.html)
does it show that your syntax is in any way valid?
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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