UICollectionView automatically scroll to bottom when screen loads

I found that nothing would work in viewWillAppear. I can only get it to work in viewDidLayoutSubviews:

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];

    [self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:endOfModel inSection:0] atScrollPosition:UICollectionViewScrollPositionNone animated:NO];
}