Ios 在Swift中更改tvOS中collectionView单元格的位置

我正试图通过设置zPosition（如下面所示的代码中所示）将聚焦的collectionView单元格带到前面。但这似乎没有任何效果。请告诉我做这件事的正确程序

 func collectionView(_ collectionView: UICollectionView, didUpdateFocusIn context: UICollectionViewFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
        if let prevIndexPath = context.previouslyFocusedIndexPath, let cell = collectionView.cellForItem(at: prevIndexPath) {
            cell.contentView.layer.zPosition = 0
        }
        
        if let indexPath = context.nextFocusedIndexPath,
            let cell = collectionView.cellForItem(at: indexPath) {
            cell.contentView.layer.zPosition = 1.0
            collectionView.scrollToItem(at: indexPath, at: [.centeredHorizontally, .centeredVertically], animated: true)
        }
    }

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由于我试图在collectionViewCell中显示图像，因此不必设置zPosition，我们可以更改adjustsImageWhenAncestorFocused属性。我找到了同样的解决办法

我必须按如下方式设置imageview的adjustsImageWhenAncestorFocused属性：

func collectionView(_ collectionView: UICollectionView, didUpdateFocusIn context: UICollectionViewFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
        if let prevIndexPath = context.previouslyFocusedIndexPath, let cell = collectionView.cellForItem(at: prevIndexPath) {
                       cell.imageView.adjustsImageWhenAncestorFocused = false
        }
        
        if let indexPath = context.nextFocusedIndexPath,
            let cell = collectionView.cellForItem(at: indexPath) {
                       cell.imageView.adjustsImageWhenAncestorFocused = true
            collectionView.scrollToItem(at: indexPath, at: [.centeredHorizontally, .centeredVertically], animated: true)
        }
    }