How to find current UIViewController in Xamarin

Question

I am using the Facebook Auth SDK, with a Xamarin Forms C# example. However, the Facebook SDK has depreciated the method and replaced it with one which adds a fromViewC

Answer 1

The best way to do this is to pass in a reference to the ViewController that is calling the Auth method.

However, you can also try this approach (courtesy of AdamKemp on the Xamarin Forums)

var window= UIApplication.SharedApplication.KeyWindow;
var vc = window.RootViewController;
while (vc.PresentedViewController != null)
{
    vc = vc.PresentedViewController;
}

Answer 2

The accepted answer won´t give you the current view controller if it´s in the stack of a parent UINavigationController, so I came up with the following:

public static UIViewController GetTopViewController()
{
    var window = UIApplication.SharedApplication.KeyWindow;
    var vc = window.RootViewController;
    while (vc.PresentedViewController != null)
        vc = vc.PresentedViewController;

    if (vc is UINavigationController navController)
        vc = navController.ViewControllers.Last();

    return vc;
}