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I have a CollectionViewController - (void)viewDidLoad { [super viewDidLoad]; // assign layout (subclassed below) self.collectionView.collectionViewLayout = [[CustomCollectionLayout alloc] init]; } // data source is working, here's what matters: - (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath { ThumbCell *cell = (ThumbCell *)[cv dequeueReusableCellWithReuseIdentifier:@"ThumbCell" forIndexPath:indexPath]; return cell; } I also have a UICollectionViewLayout subclass: CustomCollectionLayout.m #pragma mark - Overriden methods - (CGSize)collectionViewContentSize { return CGSizeMake(320, 480); } - (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect { return [[super layoutAttributesForElementsInRect:rect] mutableCopy]; } - (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath { // configure CellAttributes cellAttributes = [super layoutAttributesForItemAtIndexPath:indexPath]; // random position int xRand = arc4random() % 320; int yRand = arc4random() % 460; cellAttributes.frame = CGRectMake(xRand, yRand, 150, 170); return cellAttributes; } I'm trying to use a new frame for the cell, just one at a random position. The problem is layoutAttributesForItemAtIndexPath is not called. Thanks in advance for any advice.

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