How to check if a NSArray has the values of another array

Question

I have my array unique that is my main array and my array kind. I need to check that only 1 value of kind is present in the array unique. Then if there is more than 1 value of the array kind in unique I need to unset all values but the first one used in the array.

The further i got to achieve this is with the following code but I can not store the indexpath of the found object to do a later comparison. xcode says "bad receiver type nsinteger"

could anyone help me to achieve this?

kind = @[@"#Routine",@"#Exercise",@"#Username"];
    NSMutableArray *uniqueKind = [NSMutableArray array];
    for (NSString* obj in kind) {
        if ( [unique containsObject:obj] ) {
            NSInteger i = [unique indexOfObject:obj];
            [uniqueKind addObject: [i intValue]];
        }
    }

Your code doesn't seem to be doing what your description says. If all three strings are present in unique, you're going to add the indexes of all three to uniqueKind. Do you mean that you don't want more than one of each string in unique? — jscs
– jscs, Commented Aug 5, 2013 at 19:35

nevan king · Accepted Answer · 2013-08-05 22:53:13Z

4

An NSInteger is like an int, so you can't send it a message ([i intValue]). Also, you can't add an NSInteger to an array without making it an NSNumber or some other object type. You can do it like this:

NSInteger i = [unique indexOfObject:obj];
[uniqueKind addObject: [NSNumber numberWithInteger:i]];

Also (without understanding what you're doing) you might want to use an NSSet instead of an array. And you can combine a couple of calls:

NSUInteger i = [unique indexOfObject:obj];
if ( i != NSNotFound ) {
    [uniqueKind addObject:[NSNumber numberWithInteger:i]];
}

edited Aug 5, 2013 at 22:53

answered Aug 5, 2013 at 19:33

nevan king

114k45 gold badges207 silver badges244 bronze badges

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

1 Comment

nevan king Over a year ago

@JoshCaswell Bad copy paste. Thanks for catching it. I was demonstrating that you don't need to do the containsObject: call, as indexOfObject: will tell you if it's in the array.

Matt Long · Accepted Answer · 2013-08-05 19:42:23Z

2

I'm not sure if it would solve your problem, but have you considered using sets (or mutable variation) instead of arrays? They ensure uniqueness and they allow you to check for intersection/containment. See the NSSet class reference.

answered Aug 5, 2013 at 19:42

Matt Long

24.5k4 gold badges75 silver badges102 bronze badges

Comments

iZ. · Accepted Answer · 2013-08-05 19:38:38Z

0

You have to add objects to the NSMutableArray, not the actual intValue. Try converting teh integer to a NSNumber first.

[uniqueKind addObject: [NSNumber numberWithInt:i]];

instead.

(edited )

edited Aug 5, 2013 at 19:38

answered Aug 5, 2013 at 19:33

iZ.

5,0615 gold badges26 silver badges16 bronze badges

1 Comment

iZ. Over a year ago

Oops - my bad - try converting it to an NSNumber with numberWithInt: i

Collectives™ on Stack Overflow

How to check if a NSArray has the values of another array

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related