Enabling Screen Sharing

# Import the TRTC SDK and `replay_kit_launcher`
dependencies:
  tencent_trtc_cloud: ^0.2.1
  replay_kit_launcher: ^0.2.0+1


import ReplayKit
import TXLiteAVSDK_ReplayKitExt


let APPGROUP = "group.com.tencent.comm.trtc.demo"

class SampleHandler: RPBroadcastSampleHandler, TXReplayKitExtDelegate {

    let recordScreenKey = Notification.Name.init("TRTCRecordScreenKey")

    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.
        TXReplayKitExt.sharedInstance().setup(withAppGroup: APPGROUP, delegate: 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.
        TXReplayKitExt.sharedInstance() .finishBroadcast()
    }

    func broadcastFinished(_ broadcast: TXReplayKitExt, reason: TXReplayKitExtReason) {
        var tip = ""
        switch reason {
        case TXReplayKitExtReason.requestedByMain:
            tip = "Screen sharing ended"
            break
        case TXReplayKitExtReason.disconnected:
            tip = "App was disconnected"
            break
        case TXReplayKitExtReason.versionMismatch:
            tip = "Integration error (SDK version mismatch)"
            break
        default:
            break
        }

        let error = NSError(domain: NSStringFromClass(self.classForCoder), code: 0, userInfo: [NSLocalizedFailureReasonErrorKey:tip])
        finishBroadcastWithError(error)
    }

    override func processSampleBuffer(_ sampleBuffer: CMSampleBuffer, with sampleBufferType: RPSampleBufferType) {
        switch sampleBufferType {
        case RPSampleBufferType.video:
            // Handle video sample buffer
            TXReplayKitExt.sharedInstance() .sendVideoSampleBuffer(sampleBuffer)
            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")
        }
    }
}


// Customize a response for button tapping.
onShareClick() async {
if (Platform.isAndroid) {
   if (await SystemAlertWindow.requestPermissions) {
     MeetingTool.showOverlayWindow();
   }
 } else {
   // The screen sharing feature can only be tested on a real device.
   ReplayKitLauncher.launchReplayKitBroadcast(iosExtensionName);
 }
}