ios - Swift 中的 UIButton - 操作不起作用

Question

我正在编写我的第一个 IO 应用程序。我有我的类(class) animation，我在其中为我的按钮注册了一个 Action

class animation {
    var view: UIView!
    init(var viewLink:UIView) {
      self.view = viewLink
      let buttonNext   = UIButton.buttonWithType(UIButtonType.System) as UIButton
      buttonNext.frame = CGRectMake(200, 250, 100, 50)
      buttonNext.addTarget(self, action: "nextActionButton:", forControlEvents: UIControlEvents.TouchUpInside)
      self.view.addSubview(buttonNext)
    }
}
class ViewController: UIViewController {
      private var animClass: animation?

      required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
      }

      override func viewDidLoad() {
         super.viewDidLoad()
         animClass = animation(viewLink: self.view) 
      }

      func nextActionButton(sender:UIButton!) {
         println('rrr')
      }
}

我有一个错误:NSForwarding:警告:“animation.animation”类的对象 0x7fd820c94c00 未实现 methodSignatureForSelector:——麻烦在前
无法识别的选择器 -[animation.animation nextActionButton:]

你能帮我看看我做错了什么吗？

Answer 1

您将按钮的 Action 设置为以 animation 对象为目标，其中实际方法在您的 ViewController 中定义。

您应该将 ViewController 传递给动画的初始化类并将其用作目标:

init(var viewLink:UIView, eventTarget : AnyObject) {
    ...
    buttonNext.addTarget(eventTarget, action: "nextActionButton:", forControlEvents: UIControlEvents.TouchUpInside)
    ...
}
...
override func viewDidLoad() {
    ...
    animClass = animation(viewLink: self.view, eventTarget:self) 
    ...
}