private async void ShowLoading(AppActivityIndicator indicator)
 {
     if (!_isLoading)
     {
         return;
     }
     await PopupNavigation.Instance.PushAsync(indicator);
 }
 public IDisposable Show()
 {
     _isLoading = true;
     _indicator = new AppActivityIndicator {
         Content = _indicatorViewFactory()
     };
     ShowLoading(_indicator);
     return(Disposable.Create(HideLoading));
 }