private void SetVisibility()
 {
     IsVisible = new MainPageVisibility()
     {
         Label              = VisibleUsers.Count == 0 && AllUsers.Count != 0,
         ListView           = VisibleUsers.Count != 0,
         SomethingWentWrong = AllUsers.Count == 0,
         ActivityIndicator  = false
     };
 }
 public MainPageViewModel(INavigationService navigationService)
     : base(navigationService)
 {
     Title = "Strona główna";
     _navigationService        = navigationService;
     restService               = new RestService();
     SearchCommand             = new DelegateCommand <string>(Search);
     TextChangeInSearchCommand = new DelegateCommand(TextChangeInSearch);
     UserTappedCommand         = new DelegateCommand <User>(UserTapped);
     IsVisible = new MainPageVisibility()
     {
         ActivityIndicator  = true,
         ListView           = true,
         SomethingWentWrong = false,
         Label = false
     };
     FillAllUsers();
 }