Remove null objects from mutable array in objective c

Question

I have a mutable array of checked box

NSMutableArray *arrayOfCheckedBox = [NSMutableArray arrayWithObjects:namePropertyString, lastNamePropertyString, companyPropertyString, workEmailPropertyString, personalEmailPropertyString, workPhonePropertyString, cellNumberPropertyString, nil];
    [arrayOfCheckedBox removeObjectIdenticalTo:[NSNull null]]; //not working
    NSLog(@"array of check box = %@", arrayOfCheckedBox);

If I click on check boxes at index 0, 1 and 4, it will only collect object at indexes 0 and 1 only and will not detect index 4 at all.

I get the values at the selected index in log before getting it in arrayOfCheckedBox. How to get checked values in this case?

try replacing `[NSNull null]` to nil, have you checked [this](http://stackoverflow.com/questions/9192301/how-will-i-be-able-to-remove-nsnull-null-objects-from-nsmutablearray) — Flavien Volken, Dec 02 '13 at 13:49

score 1 · Accepted Answer · answered Dec 02 '13 at 13:56

The problem is that you're hitting a nil value, so the arrayWithObjects: method thinks you're at the end of the list of objects.

Something like this will work:

NSMutableArray *arrayOfCheckedBox = [NSMutableArray arrayWithCapacity:7];

if (namePropertyString)
    [arrayOfCheckedBox addObject:namePropertyString];

if (lastNamePropertyString)
    [arrayOfCheckedBox addObject:lastNamePropertyString];

paulvs · Answer 2 · 2013-12-02T13:56:02.603

0

I would suggest storing the check box values in an array of BOOLs. Wrap them in NSNumbers first and unwrap them to retrieve them.

Wrap to store,

[NSNumber numberWithBool:YES]]

Unwrap to retrieve,

[[your_array objectAtIndex:index] boolValue]

edited Dec 02 '13 at 13:56

answered Dec 02 '13 at 13:48

paulvs

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You can wrap them in an NSNumber, `[NSNumber numberWithBool:YES]]`, then unwrap them with `[[your_array objectAtIndex:index] boolValue];` – paulvs Dec 02 '13 at 13:52

score -1 · Answer 3 · answered Dec 02 '13 at 13:52

-1

For null values appear to be string literals @"" rather than the NSNull.So use following way to remove null object :

    NSLog(@"%d", [arrayOfCheckedBox count]);
    NSString *nullString = @"<null>";
    [arrayOfCheckedBox removeObject:nullString];
    NSLog(@"%d", [arrayOfCheckedBox count]);

answered Dec 02 '13 at 13:52

Divya Bhaloidiya

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"" only appears in some printing or formatting paths. It's not equivalent to nil or [NSNull null] in any other context. – Greg Parker Dec 06 '13 at 03:08

Remove null objects from mutable array in objective c

3 Answers3