Iglistkit: Nested adapter collection view sizing

[yusuftor]

I have an issue very similar to #332. I have a collection view inside a cell and I need to find the height of the collection view content in order to size my cell. This is a chicken and egg problem where I need the size of the content to size the collection view, but that doesn't seem to happen until the collection view has been sized. Is this solvable?

[yusuftor]

Ah solved it! For anyone interested, it was solved by reloading the context in a batch update in the ListAdapterDataSource like this:

func listAdapter(_ listAdapter: ListAdapter, sectionControllerFor object: Any) -> ListSectionController {        
    let sectionController = MySectionController()
    collectionContext?.performBatch(animated: true, updates: { context in
        context.reload(self)
    })
    return sectionController
}

Setting the collection view layout like this:

private let layout = ListCollectionViewLayout(stickyHeaders: false, topContentInset: 0, stretchToEdge: false)

// Set this in cellForItem:
cell.collectionView.collectionViewLayout = layout

And finally retrieving the size of the collection view like this:

override func sizeForItem(at index: Int) -> CGSize {
    guard let width = collectionContext?.containerSize.width else { return .zero }
    return CGSize(width: width, height: layout.collectionViewContentSize.height)
}

[SherifKamalSalem]

thank you for your lovely solution it works perfectly if the collection is scrolling vertically but when I change scroll direction to horizontal the app crashed with this error:
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Height of item 0 in section 0 (300 pt) must be less than or equal to container (0 pt) accounting for section insets {0, 0, 0, 0}'