Adding items to NSMutableArray not working

Question

I am trying to create an array of numbers that I will use later to determin the size of my tableviewcells.

However I am having some issues with the array, After my while statment it comes back as being NULL, yet when I log the values I am getting from my array of objects they are correct... and the if statement works perfectly.

This is my code

int count = 0;

// Cell heights
int smallCell = 69;
int largeCell = 120;

NSNumber *currentHeight = [[NSNumber alloc] init]; // allows int to be stored into NSArray

while (count < seriesSearchArray.count) {
    myObj = (SeriesSearchResultItem*)[dataArrayOfObjects objectAtIndex:count];

    if (![myObj.seriesNote isEqualToString:@""]) {
        NSLog(@"%@", myObj.seriesNote);
        currentHeight = [NSNumber numberWithInt:largeCell];
        NSLog(@"%@", currentHeight); // correct value shown
        [heightArray addObject:currentHeight];
    }
    else {
        currentHeight = [NSNumber numberWithInt:smallCell];
        NSLog(@"%@", currentHeight); // correct value shown
        [heightArray addObject:currentHeight];
    }


    NSLog(@"%@", heightArray); // NULL Shown

    count ++;
}

So thats if, I am trying to get the value from each of the objects in my array which works, the if statment works perfectly but then when I try to add them to my new array it always comes back as NULL.

You may need to show more code. I don't see you create (alloc/init) the heightArray. Then again, that could be the problem... — DrC
– DrC, Commented Nov 29, 2012 at 1:23
I have @property/@synthesized heightArray, because I need to access it from another method after I have put the values into it. — HurkNburkS
– HurkNburkS, Commented Nov 29, 2012 at 1:25
That creates the pointer to it. It doesn't actually create the NSMutableArray. You need something like heightArray = [NSMutableArray arrayWithCapacity:seriesSearchArray.count] — DrC
– DrC, Commented Nov 29, 2012 at 1:27

DrC · Accepted Answer · 2012-11-29 01:28:34Z

1

Moving comment to answer

You need something like

heightArray = [NSMutableArray arrayWithCapacity:seriesSearchArray.count]

answered Nov 29, 2012 at 1:28

DrC

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1 Comment

MaxGabriel Over a year ago

Similar approaches would be to do [[NSMutableArray alloc] init], [@[] mutableCopy], or to lazily instantiate it by doing any of these options in the getter for the array if it is nil.

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