如何最初在UITableView中选择一行 [英] How to initially select a row in UITableView

问题描述

我找不到合适的位置来呼叫selectRowAtIndexPath:animated:scrollPosition:来最初在UITableView中选择一行.初始化表视图控制器时，表数据尚未加载，因此我无法在UITableViewController初始化后立即进行选择(否则将发生越界异常).

I can not find a good spot to call selectRowAtIndexPath:animated:scrollPosition: to initially select a row in UITableView. Table data have not been loaded when the table view controller is initialized, so I can't do selection immediate after the initialization of my UITableViewController(Over bound exception would occur otherwise).

推荐答案

即使视图以前已经显示过，您也需要使用viewWillAppear:设置视图的状态，直到视图每次出现. UITabViewController或UINavigationViewController中的任何不可见视图都可以随时卸载，因此您不能依靠不可见视图来保持其状态.

You need to use viewWillAppear: to set the state of a view before it appears, every time it appears, even if the view has already been displayed previously. Any non-visible view in a UITabViewController or UINavigationViewController can be unloaded at any time, so you cannot count on a non-visble view to retain its state.

或者，为了更好地控制，请实现loadView，viewDidLoad和viewDidUnload.

Or, for finer control, implement loadView, viewDidLoad, and viewDidUnload.

如果要维护自己的视图控制器层次结构，则必须手动将viewWillAppear，viewWillDisappear等消息转发到子视图控制器.

If you are maintaining your own hierarchy of view controllers you will have to manually forward the viewWillAppear, viewWillDisappear, etc., messages to your sub-view controllers.

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