如何在 tvOS 的 UITableViewCell 中聚焦 UICollectionViewCell? [英] How to focus a UICollectionViewCell in UITableViewCell in tvOS?

问题描述

说明:

我有一个 UITableViewCell 列表，每个列表都有一个 UICollectionView 和 X 数量的 UICollectionViewCell(请参见下图以了解更多信息))

这背后的想法是能够实现带有顶部标题和水平滚动的部分 UICollectionView

一切都很好，除非我尝试聚焦 UICollectionViewCells(又名:CategoryCell).UITableViewCell 获得焦点并突出显示所有内容，从而无法聚焦任何 UICollectionViewCell s.

我尝试过的:

根据其他帖子，解决此问题的方法是在 UITableViewCell 上停用用户交互和/或将选择样式设置为无:

cell.selectionStyle = UITableViewCellSelectionStyle.None

并改为在 UICollectionViewCell 上启用用户交互.

以下是讨论它的帖子:

图像显示了我的 UITableViewController 以及我的 StoryBoard 中的所有内容.

解决方案

问题很可能是您的表格视图单元格将 true 返回到 canBecomeFocused.您可以通过实现 UITableViewDelegate 方法 tableView(_, canFocusRowAt:) 以返回 false 或通过子类化 UITableViewCell 并从 canBecomeFocused 返回 false.

焦点引擎将尝试关注从 canBecomeFocused 返回 true 的最顶层视图，这就是它找不到您的集合视图单元格的原因:它们隐藏"在可聚焦的表格视图单元格中.如果您禁用表格视图单元格的焦点，那么焦点引擎将能够找到您的集合视图单元格.

override func tableView(tableView: UITableView, canFocusRowAtIndexPath indexPath: NSIndexPath) ->布尔{返回假}

Description:

I have a list of UITableViewCells that have each have a UICollectionView with X amount of UICollectionViewCells (see image below for more clarity)

The idea behind this is to be able to implement sections with a header on top and a horizontal scrolling UICollectionView

Everything is working great, except when I try to focus the UICollectionViewCells (aka: CategoryCell). The UITableViewCell gets focused and highlights all the content making it impossible to focus any of the UICollectionViewCells.

What I've tried:

According to other posts the fix for this would be deactivate User Interaction and/or set the selection style to none on the UITableViewCell:

cell.selectionStyle = UITableViewCellSelectionStyle.None

and to enable User Interaction on the UICollectionViewCell instead.

Here are posts that talk about it:

UITableViewCell with UITextField losing the ability to select UITableView row?

How can I disable the UITableView selection highlighting?

I've attempted to implemen these solutions without success.

Question:

What step did I miss? Does the fix not work on tvOS? How do I focus my UICollectionViewCell that is in a UICollectionView that is in a UITableViewCell?

More:

Image showing my UITableViewController and all it's contents from my StoryBoard.

解决方案

The problem is most likely that your table view cells are returning true to canBecomeFocused. You can disable that by either implementing the UITableViewDelegate method tableView(_, canFocusRowAt:) to return false, or by subclassing UITableViewCell and returning false from canBecomeFocused.

The focus engine will try to focus on the top-most view that returns true from canBecomeFocused, which is why it can't find your collection view cells: they're "hidden" inside the focusable table view cells. If you disable focus on the table view cells, then the focus engine will be able to find your collection view cells.

override func tableView(tableView: UITableView, canFocusRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return false
}

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