Transition to a CollectionViewCell

[conanm]

I want to transition from a ViewController to a ViewController with a CollectionView that pages horiziontally and presents cells as fullscreen views to paginate through 100s of model objs. It would work smoothly if I could dequeue the cellForItemAtIndexPath and then transition (using hero IDs) from the existing screen to the cell. The problem is, to dequeue the cell it needs to be visible. So again,

• The user selects a cell in a collectionView in ViewController 1
• I want to transition to a 'full screen view' of this cell, but allow them to swipe left and right to see the full screen view of other model obj's in this array

Anyone implement this use case? Some ways I could do it:

• Transition to a ViewController with a UIScrollView that contains either Views or ViewControllers which I write my own reuse methods for (i.e. the same way a tableview or collectionview would work but I write it myself)
• Transition to a ViewController and write custom pan gesture recognisers (will be a worse exp than a normal Apple UIKit written piece of code)
• Do what I'm outlining above (not possible probably because I'm transitioning to something that is not yet rendered and is rendered lazilly/on demand - so asking for cellForItemAtIndexPath: at runtime returns nil because the collectionview hasn't been able to render a visible cell)

Thanks.

[maxydey]

It's pretty simple. I did it implementing Instagram Stories behaviour. All you need is force render collectionView of presented fullscreen VC

 override func viewDidLoad() {
        super.viewDidLoad()
        collectionView.layoutIfNeeded() // force load cells before scrolling to the index
        collectionView.scrollToItem(at: IndexPath(item: selectedIndex, section: 0), at: .centeredHorizontally, animated: false)
}