Added support for controlling tabbar visibility

Author: martinmitrevski

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### ✅ Added
 - Customizing padding for message bubble modifier
 - Customizing padding for message text view
+- Possibility to control tab bar visibility
 
 ### 🐞 Fixed
 - Fixed a bug with canceled backswipe

DemoAppSwiftUI/CustomChannelHeader.swift

@@ -26,6 +26,7 @@ public struct CustomChannelHeader: ToolbarContent {
         ToolbarItem(placement: .navigationBarTrailing) {
             Button {
                 isNewChatShown = true
+                notifyHideTabBar()
             } label: {
                 Image(uiImage: images.messageActionEdit)
                     .resizable()

Sources/StreamChatSwiftUI/ChatChannelList/ChatChannelListViewModel.swift

@@ -136,6 +136,7 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
         }
         setupChannelListController()
         observeChannelDismiss()
+        observeHideTabBar()
     }
 
     /// Returns the name for the specified channel.
@@ -427,17 +428,36 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
         )
     }
 
+    private func observeHideTabBar() {
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleHideTabBar),
+            name: NSNotification.Name(hideTabBarNotification),
+            object: nil
+        )
+    }
+    
     @objc private func dismissPresentedChannel() {
         selectedChannel = nil
     }
+    
+    @objc private func handleHideTabBar() {
+        hideTabBar = true
+    }
 }
 
 private let dismissChannel = "io.getstream.dismissChannel"
 
+private let hideTabBarNotification = "io.getstream.hideTabBar"
+
 func notifyChannelDismiss() {
     NotificationCenter.default.post(name: NSNotification.Name(dismissChannel), object: nil)
 }
 
+public func notifyHideTabBar() {
+    NotificationCenter.default.post(name: NSNotification.Name(hideTabBarNotification), object: nil)
+}
+
 /// Enum for the type of alert presented in the channel list view.
 public enum ChannelAlertType {
     case deleteChannel(ChatChannel)

StreamChatSwiftUITests/Tests/ChatChannelList/ChatChannelListViewModel_Tests.swift

@@ -260,6 +260,17 @@ class ChatChannelListViewModel_Tests: StreamChatTestCase {
         XCTAssert(viewModel.selectedChannel == nil)
     }
 
+    func test_channelListVM_hideTabBar() {
+        // Given
+        let viewModel = makeDefaultChannelListVM()
+        
+        // When
+        notifyHideTabBar()
+        
+        // Then
+        XCTAssert(viewModel.hideTabBar == true)
+    }
+    
     // MARK: - private
 
     private func makeChannelListController(