iPhone-如何保存视图控制器对象本身？ [英] iPhone- How to save the view controller object itself?

问题描述

我要保存我的视图控制器的状态。我搜索并发现我应该保存状态通过保存状态变量。

I want to save the state of my view controller. I searched and found that I should save the state by saving state variables.

但我有兴趣保存视图控制器对象本身。有任何方法来保存视图控制器对象本身，以便当我重新启动应用程序，我看到相同的视图状态，我在关闭应用程序之前。否则，我必须自己达到那个状态，并不能完全解决目的，像（显示的admob广告）无法恢复。

But I am interested in saving the view controller object itself. Is there any way to save the view controller object itself so that when I restart the application I see the same view state too on which I was before closing the app. Otherwise I have to reach that state myself and that will not solve the purpose fully as somethings like (the admob ad which was displayed) could not be restored.

如果我

推荐答案

查看在你想要持久化的所有类中实现NSCoding。如果你正确实现了，然后编码对象图在根节点（像标签栏控制器或导航栏控制器）与类似NSKeyedArchiver / NSKeyedUnarchiver当你的应用程序终止和启动，你可以保存和恢复的状态视图控制器。 UIViewController和UIView默认实现它，所以你需要做的是覆盖encodeWithCoder：和decodeWithCoder：方法，调用super，并保存你需要的状态变量。

Look into implementing NSCoding in all the classes you want to persist. If you properly implement that and then encode your object graph at a root node (like a tab bar controller or a nav bar controller) with something like NSKeyedArchiver/NSKeyedUnarchiver when your app terminates and starts up, you can save and restore the state of a view controller easily. UIViewController and UIView implement it by default, so all you need to do is override the encodeWithCoder: and decodeWithCoder: methods, call super, and save the state variables you need.

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