Segue.swift

 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        if segue.identifier == "showDetailedImage" {
            
            guard let indexPath = tableView.indexPathForSelectedRow,
            let destinationVC = segue.destination as? DetailsVC else {return}
            
            let imageToBePassed = UIImage(named: testImages[indexPath.row])
            let nameToBePassed = String(describing: "\(testNames[indexPath.row])")
            destinationVC.passedImage = imageToBePassed
            destinationVC.passedImageName = nameToBePassed
            
        }
        
    }