RubyMotion Weak Reference Block.rb

class MyController < UIViewController

  def viewDidLoad
    @button = UIButton.alloc.init
    @button.when_tapped do
      weak_self = WeakRef.new(self) # <--- create a weak reference to self

      @alert = UIAlertView.alertViewWithTitle "Alert",
        message: "Message",
        cancelButtonTitle: "Dismiss",
        otherButtonTitles: nil,
        onDismiss: lambda { |index|
          weak_self and weakself.do_something # <--- soak the weak reference
        },
        onCancel: lambda {
          weak_self and weakself.do_something_else
        }

    end
  end

end

RubyMotion Weak Reference Delegate.rb

class MyController < UIViewController

  def viewDidLoad
    @button = UIButton.alloc.init
    @button.when_tapped do
      @action_sheet = UIActionSheet.alloc.initWithTitle("Title",
        delegate: WeakRef.new(self), # <--- use weak reference here, because delegate is ViewController
        cancelButtonTitle: "Cancel",
        otherButtonTitles: "Do Something",
        nil
      )
    end
  end

  # This is the UIActionSheet's delegate method defined on the UIViewController
  def actionSheet(action_sheet, clickedButtonAtIndex: index)
    case index
    when 0
      # do something
    else
      #cancel
    end
  end

end