Filter NSArray of custom objects

Question

I have a NSArray of Contact objects, we can call it contacts. Contact is a superclass, FacebookGroup and Individual are subclasses of Contact. FacebookGroup has a property called individuals which is a set of Individual objects.

I also have a NSArray of NSString objects, we can call it userIDs.

What I want to do is create a new NSArray from the existing contacts array that match the userIDs in userIDs.

So if contacts has 3 Contact objects with userID 1,2 and 3. And my userIDs has a NSString object 3. Then I want the resulting array to contain Contact which equals userID 3.

Contact.h

Contact : NSObject

FacebookGroup.h

FacebookGroup : Contact

@property (nonatomic, strong) NSSet *individuals;

Individual.h

Individual : Contact

@property (nonatomic, strong) NSString *userID;

Mr. Frank · Accepted Answer · 2013-05-03 11:13:30Z

4

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"userId = %@", myContact.userId];
NSArray *filteredArray = [contacts filteredArrayUsingPredicate:predicate];

answered May 3, 2013 at 11:13

Mr. Frank

2882 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Peter Warbo Over a year ago

Sorry I forgot to add some information. The Contact object is actually a superclass which doesn't have the userID property. The subclasses FacebookGroup and Individual have the userID property. See my updated question.

Martin R · Accepted Answer · 2013-05-03 11:18:20Z

0

Is this what you are looking for?

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"userID IN %@", userIDs];
NSArray *filtered = [contacts filteredArrayUsingPredicate:predicate];

answered May 3, 2013 at 11:18

Martin R

541k98 gold badges1.3k silver badges1.4k bronze badges

3 Comments

Peter Warbo Over a year ago

Sorry I forgot to add some information. The Contact object is actually a superclass which doesn't have the userID property. The subclasses FacebookGroup and Individual have the userID property. See my updated question.

Martin R Over a year ago

@PeterWarbo: OK, but I think that the code should work for that case as well, did you try it?

Peter Warbo Over a year ago

Sorry, I keep forgetting information. FacebookGroup does not have a property userID instead it has a property for a NSSet of Individual objects. I updated my question.

Balu · Accepted Answer · 2013-05-03 11:44:48Z

-1

i'm expecting you want like this once see this one,

 NSMutableArray *names = [NSMutableArray arrayWithObjects:@"one", @"two", @"three", @"four", nil];
    NSMutableArray *ids = [NSMutableArray arrayWithObjects:@"1", @"2", @"2", @"3", nil];
    NSMutableArray *array=[[NSMutableArray alloc]init];
    for(int i=0;i<[ids count];i++){
       if([[ids objectAtIndex:i] isEqualToString:@"2"])
           [array addObject:[names objectAtIndex:i]];
    }
    NSLog(@"%@",array);

O/P:-

(
    two,
    three
)

answered May 3, 2013 at 11:44

Balu

8,4702 gold badges26 silver badges41 bronze badges

Collectives™ on Stack Overflow

Filter NSArray of custom objects

3 Answers 3

1 Comment

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related