Array is not passing data in segue.

 class MainViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    @IBOutlet weak var tableView: UITableView!

    let manager = WorkoutDataSource()
    var randomWorkouts = [] as [Workout]

    override func viewDidLoad() {
        super.viewDidLoad()
        self.tableView.delegate = self
        self.tableView.dataSource = self
        randomWorkouts = manager.getRandomWorkouts()
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.randomWorkouts.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)-> UITableViewCell {
        let workout = self.randomWorkouts[indexPath.row] as? Workout
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") as? WorkoutCell!
        cell!.textCell?.text = workout?.title
        cell!.backgroundColor = workout?.color
        cell!.count.text = "\(indexPath.row+1)"
        cell!.selectionStyle = UITableViewCellSelectionStyle.none
        return cell!
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if(segue.identifier == "detailview"){
            let cell = sender as? WorkoutCell
            let indexPath = tableView.indexPath(for: cell!)
            let nvc = segue.destination as? UINavigationController
            if let tmp = randomWorkouts[indexPath!.row] as? Workout{
                let dvc = nvc?.topViewController as! DetailViewController
                dvc.workout = tmp
            }
        }

              let dvc = segue.destination as? WorkoutViewController
              print("segue")
              let randomWorkoutsToPass = self.randomWorkouts
              print("size of array (randomWorkoutsToPass) before passing it through: ", randomWorkoutsToPass.count)
              print("size of array (randomWorkouts) before passing it through: ", randomWorkouts.count)
              dvc?.workouts = randomWorkoutsToPass
              print("size of array after passing it through: ", dvc?.workouts.count as Any)        
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        self.tableView.contentInset = UIEdgeInsetsMake(0,0,55,0)
    } 
}

class WorkoutViewController: UIViewController, MZTimerLabelDelegate {

    @IBOutlet weak var mainLabel: UILabel!
    @IBOutlet weak var nextUp: UILabel!
    @IBOutlet weak var workoutLabel: UILabel!
    @IBOutlet weak var timerLabel: MZTimerLabel!

    let restTime = 6.0
    let workoutTime = 30.0
    var index = 0

    //let dataSource = MainViewController()
    var workouts:[Workout]!
    var randomWorkouts:[Workout]!

    override func viewDidLoad() {
        super.viewDidLoad()
        timerLabel.delegate = self
        timerLabel.timerType = MZTimerLabelTypeTimer
        timerLabel.setCountDownTime(10)
        timerLabel.timeFormat = "ss"
        timerLabel.resetTimerAfterFinish = true
        timerLabel.start()

        workouts = randomWorkouts
        workoutLabel.text = (workouts[0]).title

        self.navigationController?.navigationBar.barTintColor = (workouts[0]).color
        self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]

        bannerView.adUnitID = "ca-app-pub-6975182968591131/5946476788"
        bannerView.rootViewController = self
        bannerView.load(GADRequest())

    }

    func timerLabel(_ timerLabel: MZTimerLabel!, finshedCountDownTimerWithTime countTime: TimeInterval) {

        if index % 2 == 0 {
            let wk = workouts[index / 2]
            timerLabel.text = "\(workoutTime)"
            mainLabel.text = (wk).title
            self.view.backgroundColor = (wk).color
            timerLabel.setCountDownTime(workoutTime);
            workoutLabel.text = "Rest !!"
            print("\(index)")
            self.navigationController?.navigationBar.barTintColor = (wk).color
        } else if index == workouts.count * 2 - 1 {
            timerLabel.pause()
            print("Paused")
            dismiss(animated: true, completion: nil)
        }

        else {
            let wk = workouts[index / 2 + 1]
            timerLabel.text = "\(restTime)"
            mainLabel.text = "Rest !!"
            self.view.backgroundColor = (wk).color
            timerLabel.setCountDownTime(restTime);
            workoutLabel.text = (wk).title
            print("\(index)")
            self.navigationController?.navigationBar.barTintColor = (wk).color
        }

        index += 1;
        if !((index/2) == workouts.count) {
            timerLabel.start()
            print("Adding to index: \(index)")
        } else {
            print("Workout done")
        }

    }
    } 
}