Cambia colore dello sfondo da strisciare a Elimina in Swift

Question

Ho cercato di cambiare il colore dello sfondo del pulsante di scorrimento per eliminare nella mia vista tabella. Ho dato un'occhiata ad alcuni esempi di Objective-C ma non sono stato in grado di tradurli in Swift.

Questo è il mio codice in questo momento:

var cellDeleteBackground = UIView() 
    cellDeleteBackground.backgroundColor = UIColor.greenColor() 
    cell.editingAccessoryView = cellDeleteBackground 

Ho questo in cellForRowAtIndexPath, ma al momento si blocca con l'errore 'termina con eccezione non identificata di tipo NSException'

Potrebbe questo codice sia interferire?

override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool { 
    if tableView == self.searchDisplayController?.searchResultsTableView { 
     return false 
    } else { 
     return true 
    } 
} 

override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) { 
    if (editingStyle == UITableViewCellEditingStyle.Delete) { 
      if tableView == self.searchDisplayController?.searchResultsTableView { 
       UITableViewCellEditingStyle.None 
      } else { 
      var valueToRemove: AnyObject! = unformatted.objectAtIndex(indexPath.row) 

      if images.objectAtIndex(indexPath.row) as NSObject == 0 { 
       totalSpendingsCounter = totalSpendingsCounter - Double(valueToRemove as NSNumber) 
       NSUserDefaults.standardUserDefaults().setDouble(totalSpendingsCounter, forKey: "spendingsCounter") 
      } else if images.objectAtIndex(indexPath.row) as NSObject == 1 { 
       totalCreditCounter = totalCreditCounter - Double(valueToRemove as NSNumber) 
       NSUserDefaults.standardUserDefaults().setDouble(totalCreditCounter, forKey: "creditCounter") 
      } 

      currencyDouble = NSUserDefaults.standardUserDefaults().doubleForKey("currencyCounter") 
      currentBudgetCalculation = currencyDouble + totalCreditCounter - totalSpendingsCounter 

      newTransactionEntered = true 

      var formatter = NSNumberFormatter() 
      formatter.numberStyle = .CurrencyStyle 
      formatter.locale = NSLocale.currentLocale() // This is the default 
      var formattedNumberCurrent = formatter.stringFromNumber(currentBudgetCalculation) 

      var defaults = NSUserDefaults(suiteName: "group.AffordIt") 
      defaults.setObject(formattedNumberCurrent, forKey: "currentBudgetWidget") 
      defaults.setObject(newTransactionEntered, forKey: "new") 

      values.removeObjectAtIndex(indexPath.row) 
      images.removeObjectAtIndex(indexPath.row) 
      names.removeObjectAtIndex(indexPath.row) 
      dates.removeObjectAtIndex(indexPath.row) 
      unformatted.removeObjectAtIndex(indexPath.row) 
      notes.removeObjectAtIndex(indexPath.row) 

      NSUserDefaults.standardUserDefaults().setObject(names, forKey: "names") 
      NSUserDefaults.standardUserDefaults().setObject(values, forKey: "values") 
      NSUserDefaults.standardUserDefaults().setObject(dates, forKey: "dates") 
      NSUserDefaults.standardUserDefaults().setObject(unformatted, forKey: "unformatted") 
      NSUserDefaults.standardUserDefaults().setObject(images, forKey: "images") 
      NSUserDefaults.standardUserDefaults().setObject(notes, forKey: "notes") 

      tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade) 
     } 
    } 
} 

Answer 1

Questo è come è possibile personalizzare colpo-to-delete in iOS 8:

func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [AnyObject]? { 
    var deleteButton = UITableViewRowAction(style: .Default, title: "Delete", handler: { (action, indexPath) in 
     self.tableView.dataSource?.tableView?(
      self.tableView, 
      commitEditingStyle: .Delete, 
      forRowAtIndexPath: indexPath 
     ) 

     return 
    }) 

    deleteButton.backgroundColor = UIColor.blackColor() 

    return [deleteButton] 
} 

Answer 2

Di seguito il codice aggiornato per Swift 4, Xcode 9:

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? { 
    let deleteButton = UITableViewRowAction(style: .default, title: "Delete") { (action, indexPath) in 
     self.tableView.dataSource?.tableView!(self.tableView, commit: .delete, forRowAt: indexPath) 
     return 
    } 
    deleteButton.backgroundColor = UIColor.black 
    return [deleteButton] 
}