Swipe Action Happens Before Seeing Button - Swift Coding

Question

I have an edit button, that you swipe right to see, that takes you to another ViewController. But when I swipe right it instantly takes me to the ViewController instead of revealing the edit button (Sometimes I get a glimpse of the edit button before it takes me there). Is there a way to slow this down or remedy this? I'm using Swift.

override func tableView(_ tableView: UITableView,
               leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?

{
    let modifyAction = UIContextualAction(style: .normal, title:  "Update", handler: { (ac:UIContextualAction, view:UIView, success:(Bool) -> Void) in
        print("Update action ...")
        success(true)

    })
    modifyAction.title = "Edit"
    modifyAction.backgroundColor = .blue

    let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
    let vc : UIViewController = mainStoryboard.instantiateViewController(withIdentifier: "FreshReleaseAdd") as UIViewController
    self.present(vc, animated: true, completion: nil)

    return UISwipeActionsConfiguration(actions: [modifyAction])

Answer 1

Move this code:

let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
let vc : UIViewController = mainStoryboard.instantiateViewController(withIdentifier: "FreshReleaseAdd") as UIViewController
self.present(vc, animated: true, completion: nil)

...to just before success(true). It needs to be what you do when the button is tapped, not something you do now.