BlurLoader

internal class BlurLoader : UIView
{
    readonly UIVisualEffectView blurEffectView;

    public BlurLoader(CGRect frame)
    {
        UIBlurEffect blurEffect = UIBlurEffect.FromStyle(UIBlurEffectStyle.Dark);
        blurEffectView = new UIVisualEffectView(blurEffect)
        {
            Frame = frame,
            AutoresizingMask = UIViewAutoresizing.FlexibleDimensions
        };

        AddSubview(blurEffectView);
        AddLoader();
    }

    private void AddLoader()
    {
        UIActivityIndicatorView activityIndicator = new UIActivityIndicatorView { ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge };
        activityIndicator.Frame = new CGRect(0, 0, 50, 50);
        blurEffectView.ContentView.AddSubview(activityIndicator);
        activityIndicator.Center = blurEffectView.ContentView.Center;
        activityIndicator.StartAnimating();
    }
}