我已将IMvXModelTouchView用于自定义弹出屏幕动画。而且，我在此弹出View上有一个关闭按钮。切换回先前View的正确方法是什么？这是我的代码:publicclassPopupView:MvxViewController,IMvxModalTouchView{publicPopupView(){ModalPresentationStyle=UIModalPresentationStyle.PageSheet;}publicoverridevoidViewDidLoad(){Title="Map";base.ViewDidLoad();varcloseButton=newU