Use tableView(_:editActionsForRowAt:) to implement swipe actions for a UITableView's cells.

editActionsForRowAt.swift

//  Use tableView(_:editActionsForRowAt:) to implement swipe actions for a UITableView's cells.
//  This example exhibits how this app makes use of this method.

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
        
//  Get the title of each section to notify the user that a cell in a particular section was swiped.
    let sectionHeaderView = tableView.headerView(forSection: indexPath.section)
    let sectionTitle = sectionHeaderView?.textLabel?.text

//  Create an action. Create custom actions in the UITableViewRowAction's closure.
    let firstBox = UITableViewRowAction(style: .normal, title: "First") { action, index in
    
//  Create an alert to notify users when they horizontally swiped a cell and then selected the first action.
    let alert = UIAlertController(title: "Alert", message: "You tapped the \"First\" box from the \(sectionTitle!) section.", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
//  Set the background color of the first action.
    firstBox.backgroundColor = UIColor.green

//  Create another action and customize the actions in the UITableViewRowAction's closure.
    let secondBox = UITableViewRowAction(style: .normal, title: "Second") { action, index in

//  Create an alert to notify users when they horizontally swiped a cell and then selected the second action.  
    let alert = UIAlertController(title: "Alert", message: "You tapped the \"Second\" box from the \(sectionTitle!) section.", preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

    }
    //  Set the background color of the second action.
    secondBox.backgroundColor = UIColor.green.withAlphaComponent(0.5)

//  Return the actions. Notice the order of the array. Actions are added from right to left.
    return [secondBox, firstBox]
}
 
//  Implement this function to allow editing for all cells.
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
    return true
}