UserSearchViewController.swift

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let userData = resultsArray[indexPath.row]
    performSegue(withIdentifier: "startCall", sender: userData)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destination.
    // Pass the selected object to the new view controller.
    if segue.identifier == "startCall" {
        guard let userData = sender as? [String: String] else {
            assert(false, "startCall segue triggered improperly")
            return
        }
        if let videoController = segue.destination as? AgoraVideoViewController {
            let uids = [currentUser?.uid ?? "", userData["uid"] ?? ""].sorted { $0 < $1 }
            let channelName = uids[0] + uids[1]
            videoController.setChannelName(channel: channelName)
            videoController.setUserName(name: currentUser?.displayName)

        }
    }
}