class CallPage extends StatelessWidget {
  const CallPage({Key? key, required this.callID}) : super(key: key);
  final String callID;

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: ZegoUIKitPrebuiltCall(
          appID: yourAppID /*input your AppID*/,
          appSign: yourAppSign /*input your AppSign*/,
          userID: userID,
          userName: userName,
          callID: callID,
          config: ZegoUIKitPrebuiltCallConfig.groupVideoCall()
            ..layout = ZegoLayout.gallery(
                showScreenSharingFullscreenModeToggleButtonRules:
                    ZegoShowFullscreenModeToggleButtonRules.alwaysShow,
                showNewScreenSharingViewInFullscreenMode:
                    false) // Set the layout to gallery mode. and configure the [showNewScreenSharingViewInFullscreenMode] and [showScreenSharingFullscreenModeToggleButtonRules].
            ..bottomMenuBarConfig = ZegoBottomMenuBarConfig(buttons: [
              ZegoMenuBarButtonName.toggleCameraButton,
              ZegoMenuBarButtonName.toggleMicrophoneButton,
              ZegoMenuBarButtonName.hangUpButton,
              ZegoMenuBarButtonName.toggleScreenSharingButton
            ]) // Add a screen sharing toggle button.
          ),
    );
  }
}

class CallPage extends StatefulWidget {
  const CallPage({Key? key, required this.callID}) : super(key: key);
  final String callID;

  @override
  State createState() => _CallPageState();
}

class _CallPageState extends State {
  // this indicates whether the current state is full screen.
  bool isFullscreen = true; 

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: ZegoUIKitPrebuiltCall(
        appID: yourAppID /*input your AppID*/,
        appSign: YourAppSign /*input your AppSign*/,
        userID: userID,
        userName: userName,
        callID: widget.callID,
        controller: controller,
        config: ZegoUIKitPrebuiltCallConfig.groupVideoCall()
          ..audioVideoViewConfig.foregroundBuilder =
              (context, size, user, extraInfo) {
            // Here is the full-screen mode button.
            return Container(
              child: OutlinedButton(
                  onPressed: () {
                    isFullscreen = !isFullscreen;
                    ZegoUIKitPrebuiltCallController().screenSharing.showViewInFullscreenMode(
                        user?.id ?? '',
                        isFullscreen,
                    ); // Call this to decide whether to show the shared screen in full-screen mode.
                  },
                  child: const Text('full screen')),
            );
          },
      ),
    );
  }
}

​​import ReplayKit
​​import ZegoExpressEngine

class SampleHandler: RPBroadcastSampleHandler, ZegoReplayKitExtHandler {

    override func broadcastStarted(withSetupInfo setupInfo: [String : NSObject]?) {
        // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.
        ZegoReplayKitExt.sharedInstance().setup(withDelegate: self)
    }
    
    override func broadcastPaused() {
        // User has requested to pause the broadcast. Samples will stop being delivered.
    }
    
    override func broadcastResumed() {
        // User has requested to resume the broadcast. Samples delivery will resume.
    }
    
    override func broadcastFinished() {
        // User has requested to finish the broadcast.
        ZegoReplayKitExt.sharedInstance().finished()
    }
    
    override func processSampleBuffer(_ sampleBuffer: CMSampleBuffer, with sampleBufferType: RPSampleBufferType) {
        
        ZegoReplayKitExt.sharedInstance().send(sampleBuffer, with: sampleBufferType)
        
        switch sampleBufferType {
        case RPSampleBufferType.video:
            // Handle video sample buffer
            break
        case RPSampleBufferType.audioApp:
            // Handle audio sample buffer for app audio
            break
        case RPSampleBufferType.audioMic:
            // Handle audio sample buffer for mic audio
            break
        @unknown default:
            // Handle other sample buffer types
            fatalError("Unknown type of sample buffer")
        }
    }
}