How to search an NSSet or NSArray for an object which has an specific value for an specific property?

iphone objective-c nsarray nspredicate nsset
dontWatchMyProfile picture dontWatchMyProfile · Jun 19, 2010 · Viewed 35.1k times · Source

How to search an NSSet or NSArray for an object which has an specific value for an specific property?

Example: I have an NSSet with 20 objects, and every object has an type property. I want to get the first object which has [theObject.type isEqualToString:@"standard"].

I remember that it was possible to use predicates somehow for this kind of stuff, right?

Answer

Ole Begemann picture Ole Begemann · Jun 19, 2010 
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"type == %@", @"standard"];
NSArray *filteredArray = [myArray filteredArrayUsingPredicate:predicate];
id firstFoundObject = nil;
firstFoundObject =  filteredArray.count > 0 ? filteredArray.firstObject : nil;

NB: The notion of the first found object in an NSSet makes no sense since the order of the objects in a set is undefined.

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