无法从表格视图中删除

Question

我正在尝试使用REST API从解析中删除图像。要删除它，我使用tableview和commitEditingStyle来设置幻灯片和删除功能。但问题是它不会滑动。我已经阅读了文档，看了很多教程，我不知道为什么我的工作不起作用。下面是tableview的代码。谢谢！

    func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
        return true
    }
    func tableView(tableView: UITableView!, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath!) {
        println("Commit Editing Style \(editingStyle)")
    }

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



    var deleteAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Delete", handler: {
        (action: UITableViewRowAction!, indexPath: NSIndexPath!) in
        println("Triggered delete action \(action) atIndexPath: \(indexPath)")
        return
    })

    return [deleteAction]
}


    func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
        if editingStyle == .Delete {


            var fileName = "uploaded_image.png"
            let applicationID = "appidwritten"
            let masterKey = "masterkeywritten"

            let request = NSMutableURLRequest(URL: NSURL(string: "https://api.parse.com/1/files/\(fileName)")!)
            request.HTTPMethod = "DELETE"
            request.setValue(applicationID, forHTTPHeaderField: "X-Parse-Application-Id")
            request.setValue(masterKey, forHTTPHeaderField: "X-Parse-Master-Key")
            NSURLSession.sharedSession().dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
    println(response)
            }).resume()

}


}