my_view_controller.rb

class MyViewController < UIViewController
   include ViewTags

   #by convention, these views will have tags that correspond to the order you specify them in
   # :date_label:1, :name_label:2
   has_view :date_label, :name_label

   def loadView
     views = NSBundle.mainBundle.loadNibNamed "myview", owner:self, options:nil
     self.view = views[0]
   end
    
   def viewDidLoad
     @date_label = get_view(:date_label)
   end
end

view_tags.rb

module ViewTags
  def self.included(base)
    base.extend ClassMethods
  end

  def get_view_with_name(name)
      view.view_with_tag(self.class.getTagFor(name))
  end

  def get_view_in(parent,with_name:name)
      parent.view_with_tag(self.class.get_tag_for(name))
  end

  module ClassMethods
    def has_view(name, with_tag:tag)
        @view_tags ||= {}
        @view_tags[name] = tag
    end
    
    def has_views(*names)
      names.each_with_index do |name, tag|
         has_view name, with_tag: tag + 1
      end
    end

    def get_tag_for(name)
        @view_tags[name]
    end
  end

end

Any idea why I might be getting the following error?

Terminating app due to uncaught exception 'NameError', reason: 'uninitialized constant CalculatorViewController::ViewTags (NameError)

app/calculate_view_controller.rb

class CalculatorViewController < UIViewController
  include ViewTags
end

and then your view_tags file also in app. Am I missing something?

Sorry I only saw your comment now.

You probably need to setup compiler dependencies between your calculate_view_controller.rb file and the view_tags.rb file. By default RM will just compile them alphabetically. You can either do this manually in your Rakefile:

Motion::Project::App.setup do |app|
   # ...
    app.files_dependencies 'calculate_view_controller.rb' => 'lib/view_tags.rb'
end

Or you can use my solution do do this automatically:

https://gist.github.com/3698332