swift - UIAlertAction 错误

Question

我正在尝试向 UIAlertController 添加一些操作，但是当我向其传递闭包时出现错误。我想将该闭包作为操作的处理程序传递，但我收到一条错误消息。

 override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){

        let optionMenu = UIAlertController(title: nil, message: "What do you want to do?", preferredStyle: .ActionSheet)
        let cancel = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
        optionMenu.addAction(cancel)

        self.presentViewController(optionMenu, animated: true, completion: nil)



        let callActionHandler = { (action:UIAlertAction) -> Void in

          let alertMessage = UIAlertController(title: "No service", message: "Sorry the phone option is not working right now, try again later", preferredStyle: .Alert)

            alertMessage.addAction(UIAlertAction(title: "Ok", style: .Default, handler: nil))

            self.presentViewController(alertMessage, animated: true, completion: nil)

        }

        let callAction = UIAlertAction(title: "Call " + "123-000-\(indexPath.row)", style: UIAlertActionStyle.Default , handler: callActionHandler)



        optionMenu.addAction(callAction)


    }

Answer 1

已解决。您只错过了!。更改以下行

let callActionHandler = { (action:UIAlertAction) -> 无效

与

let callActionHandler = { (action:UIAlertAction!) -> 无效

就是这样!