如何在scrollToRowAtIndexPath完成动画时获得通知 [英] How to get notified when scrollToRowAtIndexPath finishes animating

问题描述

这是

This is a follow-up to How to get notified when a tableViewController finishes animating the push onto a nav stack.

在一个 tableView

In a tableView I want to deselect a row with animation, but only after the tableView has finished animating the scroll to the selected row. How can I be notified when that happens, or what method gets called the moment that finishes.

这是事情的顺序：

1. 推送视图控制器


2. 在 viewWillAppear li>
   
3. 在 viewDidAppear I scrollToRowAtIndexPath
   
4. 然后，当完成滚动我想要 deselectRowAtIndexPath：animated：YES

1. Push view controller
2. In viewWillAppear I select a certain row.
3. In viewDidAppear I scrollToRowAtIndexPath (to the selected row).
4. Then when that finishes scrolling I want to deselectRowAtIndexPath: animated:YES

这样，用户将知道为什么它们在那里滚动，但是我可以淡化选择。

第4步是我还没有找到的部分。如果我在 viewDidAppear 中调用它，则在tableView在那里滚动的时候，该行已经被取消选择了，这是不好的。

This way, the user will know why they were scrolled there, but then I can fade away the selection.
Step 4 is the part I haven't figured out yet. If I call it in viewDidAppear then by the time the tableView scrolls there, the row has been deselected already which is no good.

推荐答案

您可以使用表视图委托的 scrollViewDidEndScrollingAnimation：方法。这是因为 UITableView 是 UIScrollView 和 UITableViewDelegate 符合 UIScrollViewDelegate 。换句话说，一个表视图是一个滚动视图，一个表视图委托也是一个滚动视图委托。

You can use the table view delegate's scrollViewDidEndScrollingAnimation: method. This is because a UITableView is a subclass of UIScrollView and UITableViewDelegate conforms to UIScrollViewDelegate. In other words, a table view is a scroll view, and a table view delegate is also a scroll view delegate.

所以，创建一个 scrollViewDidEndScrollingAnimation ：方法，并取消选择该方法中的单元格。有关 scrollViewDidEndScrollingAnimation：方法的信息，请参阅 UIScrollViewDelegate 的参考文档。

So, create a scrollViewDidEndScrollingAnimation: method in your table view delegate and deselect the cell in that method. See the reference documentation for UIScrollViewDelegate for information on the scrollViewDidEndScrollingAnimation: method.

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