Pop the UIViewController in xamarin ios - xamarin

Question

I want to open a UIViewController from a content page and this code helps me in doing this
UIWindow Window = new UIWindow(UIScreen.MainScreen.Bounds);
var cvc = new ScanningPage();
var navController = new UINavigationController(cvc);
Window.RootViewController = navController;
Window.MakeKeyAndVisible();
but I also want a Back button on that Controller Page which navigate me back to that content Page.
this.NavigationController.PopViewController(true);
or
this.DismissViewController(true,null);
not working in this case.

Answer 1

I would recommend not creating a new Window and a UINavigationController...
Xamarin.Forms is contained in a single VC in the first Window, so you can obtain that view controller via:
UIApplication.SharedApplication.Windows[0].RootViewController;
So as an example Dependency service that presents and dismisses a VC (either from Forms or the view controller), you can do something like this.
Dependency interface:
public interface IDynamicVC
{
void Show();
void Dismiss();
}
iOS Dependency implementation
public class DynamicVC : IDynamicVC
{
UIViewController vc;
public void Show()
{
if (vc != null) throw new Exception("DynamicVC already showing");
vc = new UIViewController();
var button = new UIButton(new CGRect(100, 100, 200, 200));
button.SetTitle("Back", UIControlState.Normal);
button.BackgroundColor = UIColor.Red;
button.TouchUpInside += (object sender, EventArgs e) =>
{
Dismiss();
};
vc.Add(button);
var rootVC = UIApplication.SharedApplication.Windows[0].RootViewController;
rootVC.PresentViewController(vc, true, () => { });
}
public void Dismiss()
{
vc?.DismissViewController(true, () =>
{
vc.Dispose();
vc = null;
});
}
}