Hi, I would recommend taking a look at the following document. http://developer.apple.com/documentation/Cocoa/Conceptual/Predicates/predicates.html Good luck,
-Conrad On Mon, Jul 28, 2008 at 1:02 AM, Fabian <[EMAIL PROTECTED]> wrote: > Thanks. Maybe I should have made myself a little more clear. I don't > want to iterate over the array, but filter the array using a > NSPredicate. > > I'm looking at the Predicate Programming Guide, which only gives basic > guidance, and the docs for NSExpression. It has several class methods > that "sound right" (expressionForEvaluatedObject:, > expressionForAggregate:, > expressionForSubquery:usingIteratorVariable:predicate:, > expressionForFunction:arguments:) but provides no examples how to use > them. Unfortunately Google has very little to say on this subject too. > > To repeat the problem: I want to check the value of all keys in every > dictionary contained by an array and see if they match my search > string. > > A workaround to compensate for my syntax ignorance would be to add a > new instance method to my custom class that simply return all the > values I want to check in a single array. Then I could query it with a > simple single-relationship predicate: > > NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(%@ IN > values, searchString)"]; > NSArray filteredArray = [myArray filteredArrayUsingPredicate:predicate]; > > But somehow I believe there is a more direct way to do this, without > having to add a new "helper method" to my class? I'm perfectly happy > with a 10.5 only solution. > > Thanks. > > > On Mon, Jul 28, 2008 at 8:30 AM, Graham Cox <[EMAIL PROTECTED]> > wrote: > > > > On 28 Jul 2008, at 1:52 pm, Omar Qazi wrote: > > > >> To be honest, I don't know if this will work, since I don't know if > >> containsObject is checking if the argument is a pointer to an object in > the > >> array, or if it is equal to the object, but it's better than nothing, I > >> guess. > > > > > > From the docs: > > > > containsObject: > > Returns a Boolean value that indicates whether a given object is present > in > > the receiver. > > > > - (BOOL)containsObject:(id)anObject > > > > Parameters > > > > anObject > > An object. > > > > Return Value > > YES if anObject is present in the receiver, otherwise NO. > > > > Discussion > > This method determines whether anObject is present in the receiver by > > sending an isEqual: message to each of the receiver's objects (and > passing > > anObject as the parameter to each isEqual: message). > > > > Availability > > • Available in Mac OS X v10.0 and later. > > > > > > > > > > cheers, Graham > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/conradwt%40gmail.com > > This email sent to [EMAIL PROTECTED] > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
