我们可以实现UIViewControllerContextTransitioning吗？

Question

The doc says "don't" :

  

不要在自己的类中采用此协议，也不应直接创建采用此协议的对象。在转换期间，该转换中涉及的动画对象从UIKit接收完全配置的上下文对象。

但是如果我们看看UIKit框架中的UIViewControllerContextTransitioning声明：

// 
// ...
//
// The UIViewControllerContextTransitioning protocol can be adopted by custom
// container controllers.  It is purposely general to cover more complex
// transitions than the system currently supports. For now, navigation push/pops
// and UIViewController present/dismiss transitions can be
// customized. Information about the transition is obtained by using the
// viewControllerForKey:, initialFrameForViewController:, and
// finalFrameForViewController: methods. The system provides two keys for
// identifying the from view controller and the to view controller for
// navigation push/pop and view controller present/dismiss transitions.
//
// ...
//

public protocol UIViewControllerContextTransitioning : NSObjectProtocol { ... }

那么，我们可以吗？

我想创建一个自定义容器视图控制器，如果在插入或移除其中一个子项时想要管理转换，则可以为另一个对象提供上下文。 Just as UINavigationController does