使用 alert.addAction 未解析的标识符

Question

我在 alert.addAction() 上遇到错误。好像我的项目不知道在哪里可以找到它，对吗？

我制作了一个没有按钮的警报，现在我正在尝试向其中添加按钮。

这是我的警报 window 和添加按钮的代码：

func naamInModelChangedHandler ( notification:NSNotification ) {
    println("De naam in de model is veranderd naar \(model.naam!)")
    NSNotificationCenter.defaultCenter().removeObserver(
                self,
                name: "NAAM_CHANGED",
                object: model)

    let alert = UIAlertController(title: "Ola", message: "De naam is gewijzigd", preferredStyle: UIAlertControllerStyle.Alert)

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

    alert.addAction(okAction)
    alert.addAction(cancelAction)

}

我用一些代码制作了一个名为 AlertController 的 UIAlertAction 按钮。

let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) { (action) -> Void in
    println("Ok geklikt")
}
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) { (action) -> Void in
    println("Cancel geklikt")
}

但我想它似乎不知道去哪里找。我在这里做错了什么？

Answer 1

这样做

func naamInModelChangedHandler ( notification:NSNotification ) {
    println("De naam in de model is veranderd naar \(model.naam!)")
    NSNotificationCenter.defaultCenter().removeObserver(
                self,
                name: "NAAM_CHANGED",
                object: model)

   let alert = UIAlertController(title: "Ola", message: "De naam is gewijzigd", preferredStyle: UIAlertControllerStyle.Alert)

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

   let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) { (action) -> Void in

    println("Ok geklikt")
   }

  let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) { (action) -> Void in

    println("Cancel geklikt")
  }

    alert.addAction(okAction)
    alert.addAction(cancelAction)

}

使用 alert.addAction 未解析的标识符

Use of unresolved identifier using an alert.addAction

alert

swift

uialertaction