在 NSViewController 之间切换
我正在开发一个 Mac 应用程序。该应用程序的左侧有一个公共源视图，右侧有一个详细视图，这是整个窗口的主要部分。
这就像主从关系，但源视图中的每个元素都需要另一个详细视图。事实上，我为源视图中的每个元素设计了一个特定的 NSViewController。
如果我在这些 NSViewController 之间切换，这意味着如果我在源视图中选择另一个元素，我将删除当前视图并添加新选择的 NSViewController 的视图。每次我更改 NSViewController 时，它的状态都会丢失。当用户回到 NSViewController 时，他必须重新开始。
我现在的问题是：如何保存 NSViewController 的状态，以便我可以在它们之间切换而不丢失其状态，并且可以从我离开的地方继续？
I'm developing a Mac Application. The application has a common source view on the left and a detail view on the right which is the main part of the whole window.
It's like a Master-Detail relationship, but each element in the source view require another detail view. In fact, I have designed a specific NSViewController for each element in the source view.
If I'm switching between these NSViewControllers, that means If I select another element in the source view, I remove the current view and add the view of the newly selected NSViewController. Everytime I change the NSViewController, its state will be lost. When the user comes back to that NSViewController, he has to start over.
My question now is: How can I save the state of the NSViewController, so that I can switch between these without losing its states and can continue where I have left?
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关于您的问题的两个注意事项：
将模型数据保留在模型类中。这意味着您始终可以重新创建视图控制器并设置其表示的对象，前提是模型类保留了通过视图控制器所做的更改。当您需要实例化视图控制器时，请将其表示的对象设置为模型类（的表示）。
从其父视图中删除视图时，不一定需要释放其相应的视图控制器。相反，您可以在窗口控制器/应用程序委托中保留对所有视图控制器的强引用，因此实际上不会丢失任何状态。
Two considerations about your problem:
Keep model data in model classes. This means that you can always recreate a view controller and set its represented object provided the model classes have kept the changes made via the view controller. When you need to instantiate a view controller, set its represented object to (a representation of) a model class.
When removing a view from its superview, you do not necessarily need to release its corresponding view controller. Instead, you can keep strong references to all view controllers in your window controller/application delegate, so no state is actually lost.
使用 NSArchiver。在 dealloc/init 方法中实现归档/取消归档，并将每个视图控制器的状态存储在以类命名的文件中（如果每个视图控制器策略有一个项目）。否则，考虑一些简单的命名约定并使用它。
Use
NSArchiver. Implement archiving/unarchiving in your dealloc/init methods and store each view controller's state in a file named after the class (if you have one item per view controller policy). Otherwise think of some simple naming convention and use it.