protected async override void OnAppearing()
{
firebaseService = new FirebaseService();
var announcementList = await firebaseService.GetAnnouncements();
announcements = new ObservableCollection <Announcement>(announcementList);
AnnouncementsView.ItemsSource = announcements;
if (announcements.Count == 0)
{
EmptyLabel.Text = "Henüz eklenmiş bir duyuru mevcut değil";
EmptyLabel.IsVisible = true;
AnnouncementsView.IsVisible = false;
}
base.OnAppearing();
}
