一：用Segue跳转页面
按住Ctrl连线，选择show，后台覆写 ShouldPerformSegue方法，返回True跳转，False取消跳转。
二：通过代码跳转至StoryBoard页面
UIStoryboard TempMainBod = UIStoryboard.FromName ("Main", null);—— ——StoryBoard文件名
UIViewController TempVC = TempMainBod.InstantiateViewController ("MainTabBarView");—— ——界面StoryBoardID
this.PresentModalViewController (TempVC, false);
三：通过RootViewController跳转
var vc = new ViewController ();
var navController = new UINavigationController (vc);
Window.RootViewController = navController;四：通过UInavigationControl进行页面跳转
var user = new UIViewController ();
btn.TouchUpInside += (sender, e) => {
this.NavigationController.PushViewController (user, true);
};