NSMutableArray converted into UICachedDeviceRGBColor at execution time

Question

Hi guys!

Now I'm working on an iPhone project and I'm using instances of the class NSMutableArray and suddenly, with no reason, at execution time the NSMutableArray converts into a UICachedDeviceRGBColor becoming unusable.

I do not know what to do, the same object had been working fine until today.

I got this error:

*** -[UICachedDeviceRGBColor count]: unrecognized selector sent to instance 0x4b3e440

Answer 1

Next time, stick your code in your question, not the comment. Here it is nicely formatted:

NSMutableArray *currentIngsGroup = [[NSMutableArray alloc] init];
currentIngsGroup = (NSMutableArray *)[allIngredientGroups objectAtIndex:0];
NSLog(@"accesing array %d", [currentIngsGroup count]);

Normally, I would say that the symptom you describe indicates that you are over-releasing something. The code, though, demonstrates a fundamental lack of understanding of Objective-C. I would suggest reading the Introduction to Objective-C document.

In particular, you are allocating an instance of NSMutableArray in the first line of code. The second line, though, immediately overwrites the mutable array reference with a reference to whatever object is at index 0 of the allIngredientGroups array.

The (NSMutableArray *) is totally unnecessary. It won't force whatever object is in the array to be a mutable array and, since -objectAtIndex: returns an (id) a cast isn't necessary.

BTW: The array allocated on the first line is being leaked. Again, read the introduction to objective-c to understand why.