iphone - 使用 RubyMotion 单击按钮时如何加载 Controller ？

Question

假设我有 2 个 Controller A 和 B。

在 A 中我有:

def viewDidLoad
  super
  button = UIButton.buttonWithType UIButtonTypeRoundedRect
  button.setTitle "Open B", forState: UIControlStateNormal
  button.addTarget(self, action: :open_b, forControlEvents: UIControlEventTouchUpInside)
  self.view.addSubview button
end

def open_b
  # ?????
end

在 B 中我有另一个 View ，它有自己的逻辑，这并不重要。

我想在点击按钮的时候打开B。我应该怎么做？

对于具有一定 iOS 经验的任何人来说，这一定是显而易见的，但我找不到您应该如何去做。任何指针表示赞赏。 Objectve-C 中的解决方案是可以接受的，并且会得到我的支持，即使我更喜欢它与 RubyMotion 一起使用。

Answer 1

以下是使用模态视图 Controller 的方法:

app_delegate.rb:

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @window.rootViewController = MyViewA.alloc.init
    @window.makeKeyAndVisible
    true
  end
end

viewa.rb:

class MyViewA < UIViewController

  def viewDidLoad
    super
    button = UIButton.buttonWithType UIButtonTypeRoundedRect
    button.setTitle "Open B", forState: UIControlStateNormal
    button.frame = [[10, 50], [300, 50]]
    button.addTarget(self, action: "open_b", forControlEvents: UIControlEventTouchUpInside)
    self.view.addSubview button
  end

  def open_b
    view_b = MyViewB.alloc.init
    view_b.delegate = self
    self.presentViewController view_b, animated:true, completion:nil
  end

  def done_with_b
    self.dismissViewControllerAnimated true, completion:nil
  end

end

viewb.rb:

class MyViewB < UIViewController

  attr_accessor :delegate

  def viewDidLoad
    super
    button = UIButton.buttonWithType UIButtonTypeRoundedRect
    button.setTitle "Return to A", forState: UIControlStateNormal
    button.frame = [[10, 50], [300, 50]]
    button.addTarget(self, action: "press_button", forControlEvents: UIControlEventTouchUpInside)
    self.view.addSubview button
  end

  def press_button
    delegate.done_with_b
  end

end