Fixed an issue in the demo app when switching users (#448)

Author: martinmitrevski

DemoAppSwiftUI/CustomChannelHeader.swift

@@ -79,7 +79,7 @@ struct CustomChannelModifier: ChannelListHeaderViewModifier {
                     message: Text("Are you sure you want to sign out?"),
                     primaryButton: .destructive(Text("Sign out")) {
                         withAnimation {
-                            chatClient.disconnect {
+                            chatClient.logout {
                                 UnsecureRepository.shared.removeCurrentUser()
                                 DispatchQueue.main.async {
                                     AppState.shared.userState = .notLoggedIn

DemoAppSwiftUI/DemoAppSwiftUIApp.swift

@@ -15,8 +15,10 @@ struct DemoAppSwiftUIApp: App {
     @ObservedObject var appState = AppState.shared
     @ObservedObject var notificationsHandler = NotificationsHandler.shared
 
-    @State var channelListController: ChatChannelListController?
-
+    var channelListController: ChatChannelListController? {
+        appState.channelListController
+    }
+    
     var body: some Scene {
         WindowGroup {
             switch appState.userState {
@@ -51,7 +53,7 @@ struct DemoAppSwiftUIApp: App {
                             .init(key: .updatedAt)
                         ]
                     )
-                    channelListController = chatClient.channelListController(query: channelListQuery)
+                    appState.channelListController = chatClient.channelListController(query: channelListQuery)
                 }
                 notificationsHandler.setupRemoteNotifications()
             }
@@ -61,7 +63,15 @@ struct DemoAppSwiftUIApp: App {
 
 class AppState: ObservableObject {
 
-    @Published var userState: UserState = .launchAnimation
+    @Published var userState: UserState = .launchAnimation {
+        willSet {
+            if newValue == .notLoggedIn && userState == .loggedIn {
+                channelListController = nil
+            }
+        }
+    }
+    
+    var channelListController: ChatChannelListController?
 
     static let shared = AppState()