问题描述
当单元格进出设备的屏幕时，我希望我的viewController确切地知道出现了什么以及出了什么。有没有办法做到这一点？
When cells come in and out of device's screen, I want my viewController to know exactly what came and what went out. Is there a way to do this?
推荐答案
可见单元格没有委托方法。当细胞离开屏幕时没有任何调用。当单元格变得可见时，确实没有任何东西。
There isn't a delegate method just for "visible cells". There isn't anything called when a cell leaves the screen. There really isn't anything when a cell becomes visible.
有 cellForRowAtIndexPath 数据源方法。当需要单元格时调用它。
There is the cellForRowAtIndexPath data source method. This is called when a cell is needed.
有 willDisplayRowAtIndexPath 委托方法。这将在显示单元格时调用。
There is the willDisplayRowAtIndexPath delegate method. This is called when a cell will be displayed.
有 didEndDisplayingCell 委托方法。从表视图中删除单元格时调用此方法。
There is the didEndDisplayingCell delegate method. This is called when a cell is removed from the table view.
<$ c上有 indexPathsForVisibleRows 方法$ C>的UITableView 。这可以让您知道当前查看的行。
There is the indexPathsForVisibleRows method on UITableView. This lets you know what rows are currently in view.
prepareForReuse 方法>的UITableViewCell 。这使得单元格重置自身可以重复用于另一行。
There is the prepareForReuse method on UITableViewCell. This lets a cell reset itself to be reused for another row.
更好地描述您要完成的任务以获得更具体的答案。
Better describe what you are trying to accomplish in order to get a more specific answer.
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