swift - "Unrecognized selector sent to instance" swift

Question

我不知道我做错了什么。我对编程也很陌生，所以我不太擅长调试。这是一个测试应用程序，因此我可以看到它与应用程序开发的结合有多 swift 。到目前为止，我得到了这个:

class ViewController: UIViewController, UITextViewDelegate {

    var textView: UITextView!

    init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        var widthField = self.view.bounds.size.width - 10
        var heightField = self.view.bounds.size.height - 69 - 221
        var textFieldString: String! = ""
        //Set up text field
        self.textView = UITextView(frame: CGRectMake(5, 64, widthField, heightField))
        self.textView.backgroundColor = UIColor.redColor()
        self.view.addSubview(self.textView)
        //Set up the New button
        var newButtonString: String! = "New Note"
        var heightButton = 568 - heightField - 1000
        let newButton = UIButton(frame: CGRect(x: 5, y: 5, width: widthField, height: 50)) as UIButton
        UIButton.buttonWithType(UIButtonType.System)
        newButton.setTitle(newButtonString,forState: UIControlState.Normal)
        newButton.backgroundColor = UIColor.redColor()
        newButton.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(newButton)

    }

    func buttonAction() {
        println("tapped button")
    }
}

当我在 iOS 模拟器中按下按钮时，我收到错误消息“无法识别的选择器发送到实例”。该应用程序可以正常打开，但只要按下按钮，它就会崩溃。

Answer 1

func buttonAction(){...

应该是

func buttonAction(sender:UIButton!)
{
    println("tapped button")
}

因为 newButton 的 action: "buttonAction:" 所以。