我的目標是在空閑超時后將用戶重定向回登錄屏幕。每次點擊/觸摸后，我都有這段代碼進行倒計時。它運行良好，但我目前的問題是我不知道將用戶重定向回登錄屏幕。由于這是 MvvmCross 4.4 項目，因此沒有太多文檔可供查找。如果我也可以獲得 Android 的示例代碼，那將非常有幫助。我會感激的。下面是我放在 Main.cs 中的代碼public class Application{      static void Main(string[] args){          //UIApplication.Main(args, null, "AppDelegate");          UIApplication.Main(args, "MyApplication", "AppDelegate");      }  }  //DELEGATE  [Register("MyApplication")]  public class MyApplication : UIApplication {      public override void SendEvent(UIEvent uievent) {          base.SendEvent(uievent);          var allTouches = uievent.AllTouches;          if (allTouches.Count > 0) {              var phase = ((UITouch)allTouches.AnyObject).Phase;              if (phase == UITouchPhase.Began || phase == UITouchPhase.Ended)                  ResetIdleTimer();          }      }      NSTimer idleTimer;      void ResetIdleTimer() {          if (idleTimer != null) {              idleTimer.Invalidate();              idleTimer.Dispose();          }          idleTimer = NSTimer.CreateScheduledTimer(TimeSpan.FromMinutes(0.5), TimerExceeded);      }      void TimerExceeded(NSTimer obj) {          MvxiOSToastService toastService = new MvxiOSToastService();        toastService.DisplayMessageAndDoSomething("You are going to be timed out.","Idle time exceeded.", RedirectToLogin);          Console.WriteLine("idle time exceeded");      }      void RedirectToLogin() {          var window = UIApplication.SharedApplication.KeyWindow;          var vc = window.RootViewController;          //ERROR HERE          var nextVC = new LoginView();           vc.ShowViewController(nextVC, this);          //----------    }  }