remove object from NSArray

Question

How can I remove an object from a reversed NSArray.

Currently I have a NSMutableArray, then I reverse it with

NSArray* reversedCalEvents = [[calEvents reverseObjectEnumerator] allObjects];

now I need to remove at item from reversedCalEvents or calEvents and automatically refresh the table the array is displayed in based on conditions. i.e.

if(someInt == someOtherInt){
    remove object at index 0
}

How can I do this? I cannot get it to work.

score 13 · Answer 1 · answered May 06 '14 at 09:36

13

Here's a more functional approach using Key-Value Coding:

@implementation NSArray (Additions)

- (instancetype)arrayByRemovingObject:(id)object {
    return [self filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF != %@", object]];
}

@end

answered May 06 '14 at 09:36

Rudolf Adamkovič

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score 12 · Answer 2 · answered Sep 15 '11 at 06:17

12

You will need a mutable array in order to remove an object. Try creating reversedCalEvents with mutableCopy.

NSMutableArray *reversedCalEvents = [[calEvents reverseObjectEnumerator] allObjects] mutableCopy];

if (someInt == someOtherInt)
{
    [reversedCalEvents removeObject:object];
}

answered Sep 15 '11 at 06:17

Mark Adams

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1

NSArray by definition is non-mutable which means once created you cannot change the contents of the allocated array – user210504 Sep 15 '11 at 06:18
4

Yes. That's why I used NSMutableArray. – Mark Adams Sep 15 '11 at 06:19

score 2 · Answer 3 · edited May 23 '17 at 11:55

2

NSArray is not editable, so that you cannot modify it.

You can copy that array to NSMutableArray and remove objects from it. And finally reassign the values of the NSMutableArray to your NSArray.

From here you will get a better idea... NSArray + remove item from array

edited May 23 '17 at 11:55

Community

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answered Sep 15 '11 at 06:20

alloc_iNit

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score 0 · Answer 4 · edited May 08 '14 at 05:52

0

you can try this:-

NSMutableArray* reversedCalEvents = [[[calEvents reverseObjectEnumerator] allObjects] mutableCopy];
            [reversedCalEvents removeLastObject];

edited May 08 '14 at 05:52

Kundan

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answered Apr 16 '14 at 06:20

sourabh sharotria

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score 0 · Answer 5 · edited May 23 '17 at 10:30

0

First you should read up on the NSMutableArray class itself to familiarize yourself with it.

Second, this question should show you an easy way to remove the objects from your NSMutableArray instance.

Third, you can cause the UITableView to refresh by sending it the reloadData message.

edited May 23 '17 at 10:30

Community

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answered Sep 15 '11 at 06:26

Beltalowda

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remove object from NSArray

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