ios - TableView 操作不显示

Question

我用这些代码创建了一个 UITableViewRowAction:

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {

    var deleteAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Delete", handler: {(action:UITableViewRowAction!, indexPath: NSIndexPath!) -> Void in

        })

    if editingStyle == UITableViewCellEditingStyle.Delete {

        let delegate = UIApplication.sharedApplication().delegate as! AppDelegate
        let managedContext = delegate.managedObjectContext!

        var error: NSError?

        let fetchRequest = NSFetchRequest(entityName: "Task")

        let fetchedResults = managedContext.executeFetchRequest(fetchRequest, error: &error) as! [NSManagedObject]

        managedContext.deleteObject(fetchedResults[indexPath.row])
        table.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Fade)

    }

当我运行它时，可以向左滑动行，但没有显示任何按钮。

我添加了这个:

func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [AnyObject]? {

    let deleteAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Delete", handler: {(action:UITableViewRowAction!, indexPath: NSIndexPath!) -> Void in

    })

    deleteAction.backgroundColor = UIColor.redColor()

    return [deleteAction]
}

并且删除了commitEditingStyle中的代码，还是没有显示。

Answer 1

如果你想要UITableviewRowAction，你委托(delegate)的方法不对

试试这个

override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {

}
override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [AnyObject]? {
    let action = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "First") { (action:UITableViewRowAction!, indexPath:NSIndexPath!) -> Void in
        //Do action here
    }
    action.backgroundColor = UIColor .greenColor()
      return [action]
}

截图