Hi,
I am try to open the device settings (in iOS11) so that the user can change to required settings.
Implemented the Interface in the SharedCode so that I can make the call from there.
The Android part works fine: Android.Content.Intent vpnSettingIntent = new Intent(Settings.ActionSettings);
For the iOS part I have no idea how to access the (in swift UIApplication.shared.open) method in xamarin.
VS does not know UIApplication in this context, nor can I use Xamarin.iOS. VS ask: "reference missing?"
but there's no reference missing, if I'm not mistaken.
In addition, after a long research I am not sure which mehodes are now deprecated and which are not or not supported by xamarin.
I hope you have an idea 
Thank you in advance