Screen Sharing - CometChat Docs

View screen shares from other participants during a call. The iOS SDK can receive and display screen shares initiated from web clients.

The iOS Calls SDK does not support initiating screen sharing. Screen sharing can only be started from web clients. iOS participants can view shared screens.

How It Works

When a web participant starts screen sharing:

The SDK receives the screen share stream
The call layout automatically adjusts to display the shared screen prominently
iOS participants can view the shared content

Monitor when participants start or stop screen sharing:

Swift
Objective-C

class CallViewController: UIViewController, ParticipantEventListener {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        CallSession.shared.addParticipantEventListener(self)
    }
    
    deinit {
        CallSession.shared.removeParticipantEventListener(self)
    }
    
    func onParticipantStartedScreenShare(participant: Participant) {
        print("\(participant.name ?? "") started screen sharing")
        // Layout automatically adjusts to show shared screen
    }

    func onParticipantStoppedScreenShare(participant: Participant) {
        print("\(participant.name ?? "") stopped screen sharing")
        // Layout returns to normal view
    }

    // Other callbacks...
    func onParticipantJoined(participant: Participant) {}
    func onParticipantLeft(participant: Participant) {}
    func onParticipantListChanged(participants: [Participant]) {}
    func onParticipantAudioMuted(participant: Participant) {}
    func onParticipantAudioUnmuted(participant: Participant) {}
    func onParticipantVideoPaused(participant: Participant) {}
    func onParticipantVideoResumed(participant: Participant) {}
    func onParticipantStartedRecording(participant: Participant) {}
    func onParticipantStoppedRecording(participant: Participant) {}
    func onParticipantHandRaised(participant: Participant) {}
    func onParticipantHandLowered(participant: Participant) {}
    func onDominantSpeakerChanged(participant: Participant) {}
}

@interface CallViewController () <ParticipantEventListener>
@end

@implementation CallViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [[CallSession shared] addParticipantEventListener:self];
}

- (void)dealloc {
    [[CallSession shared] removeParticipantEventListener:self];
}

- (void)onParticipantStartedScreenShareWithParticipant:(Participant *)participant {
    NSLog(@"%@ started screen sharing", participant.name);
    // Layout automatically adjusts to show shared screen
}

- (void)onParticipantStoppedScreenShareWithParticipant:(Participant *)participant {
    NSLog(@"%@ stopped screen sharing", participant.name);
    // Layout returns to normal view
}

// Other callbacks...

@end

Use the isPresenting property on the Participant object to check if someone is sharing their screen:

Swift
Objective-C

func onParticipantListChanged(participants: [Participant]) {
    if let presenter = participants.first(where: { $0.isPresenting }) {
        print("\(presenter.name ?? "") is currently sharing their screen")
    }
}

- (void)onParticipantListChangedWithParticipants:(NSArray<Participant *> *)participants {
    for (Participant *p in participants) {
        if (p.isPresenting) {
            NSLog(@"%@ is currently sharing their screen", p.name);
            break;
        }
    }
}

​How It Works

​Listen for Screen Share Events

​Check Screen Share Status

How It Works

Listen for Screen Share Events

Check Screen Share Status