可可触摸 - 无法使 UIBarButtonItem 的操作起作用

Question

我有一个控制器和一个按钮。当点击按钮时，我想显示一个UIAlertView。我不能工作的是UIBarButtonItem的action参数。

In my controller

class TapController < UIViewController
  def alert
    alert = UIAlertView.new
    alert.message = "It's working"
    alert.show
  end
  def viewDidLoad
    super
    self.view.backgroundColor = UIColor.whiteColor
    right_button = UIBarButtonItem.alloc.initWithTitle("Go Deeper",
                                                       style:UIBarButtonItemStyleBordered,
                                                       target:self,
                                                       action:'alert')
    self.navigationItem.rightBarButtonItem = right_button
  end
end

My app/app_delegate.rb:

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    #UIScreen is the display the app runs on
    @window = UIWindow.new.initWithFrame(UIScreen.mainScreen.bounds)
    @window.makeKeyAndVisible
    controller = TapController.alloc.initWithNibName(nil, bundle: nil)
    @window.rootViewController = UINavigationController.alloc.initWithRootViewController(controller)
    true
  end
end

它很简单，但是UIBarButtonItem的target或action属性没有像预期的那样工作

Answer 1

你的问题是。在你的app委托中，你需要在UIWindow上调用alloc而不是new。

@window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)