indexPathForPreferredFocusedView 没有被调用 [英] indexPathForPreferredFocusedView is not being Called

问题描述

我需要指定哪个单元格应该获得焦点.

I need to specify which cell should receive focus.

根据 Apple 文档，如果 remembersLastFocusedIndexPath 属性为 false 或没有保存的索引路径，则应调用 indexPathForPreferredFocusedView 委托方法因为之前没有单元格被聚焦.

According to Apple Documentation the indexPathForPreferredFocusedView delegate method should be called if the remembersLastFocusedIndexPath property is false, or if there is no saved index path because no cell was previously focused.

在我的情况下，我在 UIViewController 中使用集合视图并将 remembersLastFocusedIndexPath 设置为 false 但 indexPathForPreferredFocusedView没有被调用.

In my case I am using a collection view in a UIViewController and setting remembersLastFocusedIndexPath to false but indexPathForPreferredFocusedView is not being called.

如何解释这种行为?

推荐答案

您应该将 remembersLastFocusedIndexPath 设置为 true.

You should set remembersLastFocusedIndexPath to true.

collectionView.remembersLastFocusedIndexPath = true

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