Showing spinner on first load

ConfCore/Storage.swift

@@ -302,6 +302,10 @@ public final class Storage {
         }
     }
     
+    public var isEmpty: Bool {
+        return realm.objects(Event.self).count <= 0
+    }
+    
     public func removeFavorite(for session: Session) {
         guard let favorite = session.favorites.first else { return }
         

WWDC/AppCoordinator.swift

@@ -182,6 +182,10 @@ final class AppCoordinator {
     }
     
     private func doUpdateLists() {
+        if !storage.isEmpty {
+            tabController.hideLoading()
+        }
+        
         storage.tracksObservable.subscribe(onNext: { [weak self] tracks in
             self?.videosController.listViewController.tracks = tracks
         }).dispose()
@@ -204,6 +208,10 @@ final class AppCoordinator {
         windowController.contentViewController = tabController
         windowController.showWindow(self)
         
+        if storage.isEmpty {
+            tabController.showLoading()
+        }
+        
         NotificationCenter.default.addObserver(forName: .SyncEngineDidSyncSessionsAndSchedule, object: nil, queue: OperationQueue.main) { _ in
             self.updateListsAfterSync(migrate: true)
         }

WWDC/WWDCTabViewController.swift

@@ -145,4 +145,14 @@ class WWDCTabViewController<Tab: RawRepresentable>: NSTabViewController where Ta
         return self.view.window?.toolbar?.items.flatMap({ $0.view as? TabItemView }) ?? []
     }
     
+    private var loadingView: ModalLoadingView?
+    
+    func showLoading() {
+        loadingView = ModalLoadingView.show(attachedTo: self.view)
+    }
+    
+    func hideLoading() {
+        loadingView?.hide()
+    }
+    
 }