RubyMotion未定义方法`addTarget'用于＃<uiroundedrectbutton：0x761fd40> </uiroundedrectbutton：0x761fd40>

Question

我正在关注动画广播的截屏视频： http://motioncasts.tv/start-building-views-in-rubymotion/

还有一些代码：

button = UIButton.buttonWithType(UIButtonTypeRoundedRect)
button.frame = [[15, 300], [280,50]]
button.setTitle("Move to next view", forState: UIControlStateNormal)
button.addTarget(self,
                 action: "moveToChildView:",
                 formControlEvents: UIControlEventTouchUpInside)

哪个应该有效，但在尝试编译时会产生错误：

(main)> 2013-04-18 18:41:06.205 12wbt[76267:c07] home_controller.rb:19:in `viewDidLoad': undefined method `addTarget' for #<UIRoundedRectButton:0x761fd40> (NoMethodError)
    from app_delegate.rb:6:in `application:didFinishLaunchingWithOptions:'
2013-04-18 18:41:06.208 12wbt[76267:c07] *** Terminating app due to uncaught exception 'NoMethodError', reason: 'home_controller.rb:19:in `viewDidLoad': undefined method `addTarget' for #<UIRoundedRectButton:0x761fd40> (NoMethodError)
    from app_delegate.rb:6:in `application:didFinishLaunchingWithOptions:'
'

据我所知，这是截屏视频的确切代码，应该可以无错误地工作。有什么问题？

Answer 1

问题解决了。最后一行应为 forControlEvents ，而不是 formControlEvents 。