如何在 tvOS 中使用嵌套集合视图更改重用表视图单元格的焦点？

Question

I have table view with nested collection view(horizontal scrolling) into table view cell. Something like that:

-table view: 
  - section
   - cell: 
    - collection view

On starting screen I have 3 sections with 1 cell in each section. When I try to reuse 1 section with cell, indexPath for focused item don't change.

For example, if I select 1 section 1 cell and focused 12th item in collection view, then I scroll down table view in this manner I change focused item and switch to another section of table view. So I reuse cell and see the same focused indexPath ( 12 row ). So collection view scrolles to this item.

I tried to reset preferredFocusEnvironments in

override func prepareForReuse()

but it had no result. And when I set to false collectionView.remembersLastFocusedIndexPath = false it didn't help me to solve the problem. How can I fix this problem?

Answer 1

I found out that problem was in contentOffset in collectionView . When I reused tableViewCell I didn't reset offset in collectionView. So I saved all offset for each collectionView in tableViewCell and set this value by key to collectionView. Something like this(in func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) ):

return tableView.dequeueReusableCell(cellClass: HomeTableViewCell.self, for: indexPath).adjust {

    if let id = $0.feedID {
      contentOffsets[id] = $0.collectionView.contentOffset
    }
    $0.preprareForDisplay(feed: feeds[indexPath.section)
    $0.collectionView.contentOffset = contentOffsets[feeds[indexPath.section].origin.id] ?? .zero
  }

So after that focus work correct.