Hi, I have a simple question regarding xcode coding but don't know why things are not performing as I think. I have an array of objects (custom objects). I just want to check if this one is within the array. I used the following code:

NSArray *collection = [[NSArray alloc] initWithObjects:A, B, C, nil]; //custom "Item" objects
Item *tempItem = [[Fruit alloc] initWithLength:1 width:2 height:3];  //3 instance variables in "Item" objects
if([collection containsObject:tempItem]) {
    NSLog(@"collection contains this item");
}

I suppose the above checking will give me a positive result but it's not. Further, I checked whether the objects created are the same.

NSLog(@"L:%i W:%i H:%i", itemToCheck.length, itemToCheck.width, itemToCheck.height);
for (int i = 0, i < [collection count], i++) {
    Item *itemInArray = [collection objectAtIndex:i];
    NSLog(@"collection contains L:%i W:%i H:%i", itemInArray.length, itemInArray.width, itemInArrayheight);
}

In the console, this is what I got:

L:1 W:2 H:3
collection contains L:0 W:0 H:0
collection contains L:1 W:2 H:3
collection contains L:6 W:8 H:2

Obviously the tempItem is inside the collection array but nothing shows up when I use containsObject: to check it. Could anyone give me some direction which part I am wrong? Thanks a lot!