// Obscure UI in multitasking view
public override void OnResignActivation(UIApplication uiApplication)
{
base.OnResignActivation(uiApplication);
// Prevent taking snapshot
uiApplication.IgnoreSnapshotOnNextApplicationLaunch();
// Create our hiding view which is transparent initially. Also note the tag I'm giving the view. Why 42 you ask..?
// For this example let's just use a Xamarin Blue background color
var bgView = new UIView(uiApplication.KeyWindow.Frame)
{
Tag = 42, Alpha = 0, BackgroundColor = Color.FromHex("#449CD5").ToUIColor()
};
// Add the view to our current window
uiApplication.KeyWindow.AddSubview(bgView);
uiApplication.KeyWindow.BringSubviewToFront(bgView);
// Animate it to the front and thus hide the contents of the app
UIView.Animate(0.5, () =>
{
bgView.Alpha = 1;
});
}