在Swift中更改滑动到删除背景的颜色

Question

我一直试图在我的tableview中更改滑动背景的颜色以删除按钮.我看了一些Objective-C示例,但我无法将它们转换为Swift.

这是我目前的代码:

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

我在cellForRowAtIndexPath中有这个,但是它崩溃时出现错误'终止,类型为NSException的未捕获异常'

这段代码可能会干扰吗？

    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

这是您在iOS8中自定义滑动到删除的方法:

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

下面是针对 Swift 4、Xcode 9 更新的代码：

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]
}