Apps/Locations/Sources/Protocols/ViewModeling/LocationsListViewModeling.swift

@@ -6,12 +6,17 @@
 //  Copyright © 2023 Röck+Cöde. All rights reserved.
 //
 
+import Combine
+import Foundation
+
 protocol LocationsListViewModeling: AnyObject {
     
     // MARK: Properties
     
     var coordinator: LocationsListCoordination? { get set }
     
+    var viewStatusPublisher: Published<LocationsListViewStatus>.Publisher { get }
+    
     // MARK: Functions
     
     func openAddLocation()

Apps/Locations/Sources/Screens/LocationsList/LocationsListViewController.swift

@@ -6,6 +6,7 @@
 //  Copyright © 2023 Röck+Cöde. All rights reserved.
 //
 
+import Combine
 import Core
 import UIKit
 
@@ -15,6 +16,8 @@ class LocationsListViewController: BaseViewController {
     
     private let viewModel: LocationsListViewModeling
     
+    private var cancellables: Set<AnyCancellable> = []
+    
     // MARK: Outlets
     
     private lazy var error = ErrorMessageView()
@@ -46,6 +49,7 @@ class LocationsListViewController: BaseViewController {
 
         setupBar()
         setupView()
+        bindViewModel()
     }
     
 }
@@ -72,12 +76,7 @@ private extension LocationsListViewController {
         view.addSubview(table)
         view.addSubview(error)
         view.addSubview(loading)
-        
-        error.isHidden = true
         error.onRetry = { print("RETRY BUTTON PRESSED!") }
-        
-        loading.isHidden = true
-        
         NSLayoutConstraint.activate([
             error.widthAnchor.constraint(equalToConstant: 300),
             view.centerXAnchor.constraint(equalTo: error.centerXAnchor),
@@ -91,6 +90,19 @@ private extension LocationsListViewController {
         ])
     }
     
+    func bindViewModel() {
+        viewModel
+            .viewStatusPublisher
+            .receive(on: RunLoop.main)
+            .sink { viewStatus in
+                self.navigationItem.rightBarButtonItem?.isEnabled = viewStatus == .loaded
+                self.error.isHidden = viewStatus != .error
+                self.loading.isHidden = viewStatus != .loading
+                self.table.isHidden = viewStatus != .loaded
+            }
+            .store(in: &cancellables)
+    }
+    
     @objc func addLocationPressed() {
         viewModel.openAddLocation()
     }

Apps/Locations/Sources/Screens/LocationsList/LocationsListViewModel.swift

@@ -15,6 +15,8 @@ class LocationsListViewModel: ObservableObject {
     
     weak var coordinator: LocationsListCoordination?
     
+    @Published private var viewStatus: LocationsListViewStatus = .initialised
+    
     // MARK: Initialisers
     
     init(coordinator: LocationsListCoordination) {
@@ -27,6 +29,10 @@ class LocationsListViewModel: ObservableObject {
 
 extension LocationsListViewModel: LocationsListViewModeling {
     
+    // MARK: Properties
+    
+    var viewStatusPublisher: Published<LocationsListViewStatus>.Publisher { $viewStatus }
+    
     // MARK: Functions
     
     func openAddLocation() {
@@ -34,3 +40,12 @@ extension LocationsListViewModel: LocationsListViewModeling {
     }
     
 }
+
+// MARK: - Enumerations
+
+enum LocationsListViewStatus {
+    case initialised
+    case loading
+    case loaded
+    case error
+}