Array-within-array items replacement

Question

I have a list of arrays, each of elements of these is array to. I know, it's a little freaky, but it's necessary. So, I need to replace elements of deepest array. I've tried this:

for (int i = 0; i < [myArray count]; i++) {
    for (int j = 0; j < [[myArray objectAtIndex:i] count]; j++) {
        for (int k = 0; k < [[[myArray objectAtIndex:i] objectAtIndex:j] count]; k++) {
            [[[myArray objectAtIndex:i] objectAtIndex:j] replaceObjectAtIndex:k withObject:@"Some_string"];
        }
    }
}

and got an error *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI replaceObjectAtIndex:withObject:]: unrecognized selector sent to instance. But I can to log this element, e.g. NSLog(@"%@", [NSString stringWithFormat:@"%@",[[[myArray objectAtIndex:0] objectAtIndex:0]objectAtIndex:0]]);, it's ok.

What it can be? Thanks for your help.

LordTwaroog · Accepted Answer · 2011-12-27 15:43:32Z

1

Are your arrays instances of NSMutableArray instead of immutable NSArray?

answered Dec 27, 2011 at 15:43

LordTwaroog

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4 Comments

Akki Over a year ago

Yes. I should convert it to NSMutableArray? UPDATE: I create mutable array from myArray by NSMutableArray *myMutArray = [myArray mutableCopy], but it doesn't helps.

mrueg Over a year ago

I think the problem is that you need to have the inner arrays mutable. So instead of [myArray mutableCopy] do myMutArray = [NSMutableArray array], then go through myArray and add, for each subarray, its mutableCopy to the new myMutArray.

Akki Over a year ago

Sorry, little misunderstanding. myArray is instance of NSArray initially. @mrueg, ok, thanks, I'll try.

jlehr Over a year ago

@mrueg mutableCopy is guaranteed to return a mutable instance.

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