Swift 5: iOS: 13.1 Runs a script in another viewController: in this gists example, you can reload data in a TableView from a different ViewController

Notification - Observer.swift

// --------------- VIEW CONTROLLER 1 -----------------------
// MARK: NOTIFICATION
extension Notification.Name {
    static let reload = Notification.Name("reload")
}

// MARK: CALLER
NotificationCenter.default.post(name: .reload, object: nil)

// --------------- VIEW CONTROLLER 2 -----------------------
override func viewDidLoad() {
    super.viewDidLoad()
    
    // MARK: OBSERVER
    NotificationCenter.default.addObserver(self, selector: #selector(reloadTableData), name: .reload, object: nil)
    
}

// MARK: METHOD
@objc func reloadTableData(_ notification: Notification) {
    tableView.reloadData()
    tableView.layoutIfNeeded()
}

To use:

1. Create the NOTIFICATION extension
2. Post the CALLER of the notification at the point in the current script at which you need to call the method from the other view
3. In the view controller holding the method you desire to run, insert an OBSERVER for the notification in .viewDidLoad()
4. Expose the METHOD with (@objc) and ensure method name is the same as the #selector from the OBSERVER