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I am creating a UICollectionViewController programmatically. No, I don't want to use IB and Storyboards like every tutorial out there. I just want to use plain code. Here is what I have in my viewDidLoad : // UICollectionView UICollectionViewFlowLayout *aFlowLayout = [[UICollectionViewFlowLayout alloc] init]; [aFlowLayout setItemSize:CGSizeMake(200, 140)]; [aFlowLayout setScrollDirection:UICollectionViewScrollDirectionVertical]; self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:aFlowLayout]; [self.collectionView setDelegate:self]; [self.collectionView setDataSource:self]; self.collectionView.backgroundColor = [UIColor clearColor]; [self.collectionView setAutoresizingMask:UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleWidth]; [self.collectionView registerClass:[PUCImageGridCell class] forCellWithReuseIdentifier:CollectionViewCellIdentifier]; I have implemented the required delegate methods and I still get this error: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'UICollectionView must be initialized with a non-nil layout parameter'

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