Adding items to array doesn't seem to work

Question

I have written a function that adds a ball to an array yet when I check the count it hasnt increased, please can someone advise.

NSMutableArray *_otherBalls;


-(void)addBall{
    CCSprite *target = [CCSprite spriteWithFile:@"redbouncyball.gif" rect:CGRectMake(0, 0, 27, 40)]; 

    [self addChild:target];

    //add to our array
    [_otherBalls addObject:target];

    NSLog(@"Added ball : %@",[_otherBalls count]);
}

The log comes out as

Added ball : (null)

Perhaps it works, but it's still wrong. count is not declared as a property and you shouldn't use it as such. — jtbandes
– jtbandes, Commented Jul 17, 2011 at 20:39
Don't use single leading underscores on your variable names. That's an Apple internal coding convention, and they do it so that their names won't collide with yours. — NSResponder
– NSResponder, Commented Jul 17, 2011 at 21:08
Oh really? I was doing that from tutorials that I read! Ill bear that in mind next time, thanks — Chris
– Chris, Commented Jul 17, 2011 at 21:32

Cyprian · Accepted Answer · 2011-07-17 20:37:23Z

5

From your code it seams that you have never initialized the array. So it' cant store anything. Unless you did in init, but thats hard to guess.

answered Jul 17, 2011 at 20:37

Cyprian

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Comments

tomk · Accepted Answer · 2011-07-17 20:50:16Z

4

Try

 NSLog(@"Added ball : %lu",[_otherBalls count]);

count is an integer, not an NSObject.

edited Jul 17, 2011 at 20:50

answered Jul 17, 2011 at 20:36

tomk

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2 Comments

Chris Gregg Over a year ago

Actually, it should be %lu.

Eiko Over a year ago

This is correct, but not the problem... as 0 is semantically the same as nil here.

Artem Shmatkov · Accepted Answer · 2013-04-06 12:36:02Z

1

Is _otherBalls an NSMutableArray? Did you make sure to alloc and init _otherBalls?

EDITED: to reflect edited question

edited Apr 6, 2013 at 12:36

Artem Shmatkov

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answered Jul 17, 2011 at 20:32

dreyln

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3 Comments

Chris Over a year ago

Yes it is, I updated the code (and the Q) with the correct count syntax and still get the issue

Chris Over a year ago

Ahh spot on, silly mistake. Why didnt XCode crash or throw an exception when I tried to add an item to an uninitialized array?

dreyln Over a year ago

it is legal (won't cause an exception) to send a message to nil. Quite different from most other languages

Artem Shmatkov · Accepted Answer · 2013-04-06 12:33:13Z

0

NSLog(@"Added ball: %d", [_otherBalls count]);

Try this because you are counting objects in an array and the result would be integer.
If the problem persists then it means that you havent initialized your array

_otherBalls = [[NSMutableArray alloc] init];

edited Apr 6, 2013 at 12:33

Artem Shmatkov

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answered Jul 17, 2011 at 20:43

Fahad Idrees

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