Xamarin.ios TransitionLegate和MVVMCross

我正在尝试使用IUIViewController TransitioningDelegate实现视图之间的自定义转换。这是我的TableViewController

public class TableListView : MvxTableViewController, IUIViewControllerTransitioningDelegate
{
...
[Export ("animationControllerForPresentedController:presentingController:sourceController:")]
        public MonoTouch.UIKit.IUIViewControllerAnimatedTransitioning PresentingController (MonoTouch.UIKit.UIViewController presented, MonoTouch.UIKit.UIViewController presenting, MonoTouch.UIKit.UIViewController source)
{
...
}

[Export ("animationControllerForDismissedController:")]
public  MonoTouch.UIKit.IUIViewControllerAnimatedTransitioning GetAnimationControllerForDismissedController (MonoTouch.UIKit.UIViewController dismissed)
{
...
    }
}

但当我从core显示另一个ViewModel时，不会调用GetAnimationControllerForDismissedController或PresentingController（当显示其自身时）

这里有一个monotouch的例子

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你能展示你的导航控制器或演示者吗？无论你做什么，与我尝试过的示例相当，它都不起作用！只有从导航控制器设置动画，而不是从viewcontroller设置动画，它才有效！