Re: NSPredicate and custom sort selector
Re: NSPredicate and custom sort selector
- Subject: Re: NSPredicate and custom sort selector
- From: Kirk <email@hidden>
- Date: Fri, 30 May 2014 17:00:19 -0500
A string is a string - the user's input will have the ratioValue property available.
Up to you to sanity check the user input of course.
Kirk Kerekes
(iPhone)
On May 30, 2014, at 4:56 PM, Trygve Inda <email@hidden> wrote:
>> Create a property-styled category on NSString that returns the numeric value
>> of a ratio-string -- call it "ratioValue" perhaps. Then you can have a
>> predicate format of the form:
>>
>> @"self.ratioValue > %@.ratioValue"
>>
>> -- or whatever.
>>
>> The same category would be useful in KVC collection operations.
>>
>> Kirk Kerekes
>> (iPhone)
>
> As a followup:
>
> I can make the lefExpression keypath "aspectRatio.ratioValue"
>
> But how would I make what the User enters in the Predicate Editor text field
> pass through the ratioValue method?
>
> If I just change the leftExpression to "aspectRatio.ratioValue" that changes
> one side of the comparison, but what the user has entered is still a string
> like "4:3".
>
>
>
>
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