UITabBarController - 检测选项卡何时被取消选择
如果您有 4 个选项卡，那么通知视图控制器之一它已被“取消选择”的最佳方式是什么。换句话说，选择了另一个选项卡？
我不能只使用 viewDidDisappear，因为无论如何这都可能发生。视图控制器是否有另一种方法知道它不再是活动选项卡？
TabBar 委托（didSelectViewController）告诉我选择了哪个选项卡，但我需要知道在选择之前哪个选项卡处于活动状态，以便我可以告诉视图控制器杀死一些东西。
If you have 4 tabs, what is the best way to inform one of the view controllers that it has been "deselected". In other words, that another tab was selected?
I can't just use viewDidDisappear, because that may happen anyway. Is there another way for a view controller to know that it is no longer the active tab?
The TabBar delegate (didSelectViewController) tells me which was selected, but I need to know which tab was active BEFORE the selection, so that I can tell the view controller to kill some things.
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shouldSelectViewController 有一个 TabBar 委托方法，该方法被调用以请求更改视图控制器的权限，以及 selectedViewController 或 selectedIndex 的 UITabBarController 属性。
需要验证 selectedIndex 或 selectedViewController 在 shouldSelectViewController 方法返回之前不会更改...
There is a TabBar delegate method of shouldSelectViewController which gets called to ask permission to change the view controller and a UITabBarController property of selectedViewController or selectedIndex.
Would need to verify that selectedIndex or selectedViewController does not change until the shouldSelectViewController method returns though...