Example RubyMotion app using the Routable gem with a Rails-like routes.rb file.

alphabet_controller.rb

# app/controllers/alphabet_controller.rb

class AlphabetController < UITableViewController
  def viewDidLoad
    super

    self.title = 'Alphabet'
    view.backgroundColor = UIColor.whiteColor
  end

  # UITableViewDataSource

  def tableView(table_view, numberOfRowsInSection: section)
    letters.count
  end

  def tableView(table_view, cellForRowAtIndexPath: index_path)
    UITableViewCell.alloc.initWithStyle(UITableViewStylePlain, reuseIdentifier: 'LetterCell').tap do |cell|
      cell.textLabel.text = letters[index_path.row]
    end
  end

  # UITableViewDelegate

  def tableView(tableView, didSelectRowAtIndexPath: index_path)
    Routable::Router.router.open("letters/#{letters[index_path.row]}")
  end

  private

  def letters
    @letters ||= ('A'..'Z').to_a
  end
end

app_delegate.rb

# app/app_delegate.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions: launch_options)
    true

    router.navigation_controller = UINavigationController.new

    initialize_main_controller

    Routable::Router.router.open('alphabet')
  end

  private

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

    @window.setRootViewController(router.navigation_controller)
    @window.makeKeyAndVisible
  end

  def router
    Routable::Router.router
  end
end

Gemfile

# Gemfile

source 'https://rubygems.org'

gem 'rake'
gem 'routable'

letter_controller.rb

# app/controllers/letter_controller.rb

class LetterController < UIViewController
  def initWithParams(params = {})
    init.tap do |controller|
      controller.instance_variable_set(:@letter, params[:letter])
    end
  end

  def viewDidLoad
    super

    self.title = letter_label.text = @letter
    view.backgroundColor = UIColor.whiteColor

    view.addSubview(letter_label)

    setup_constraints
  end

  def setup_constraints
    [NSLayoutAttributeCenterX, NSLayoutAttributeCenterY].each do |attribute|
      view.addConstraint(
        NSLayoutConstraint.constraintWithItem(
          letter_label,
          attribute: attribute,
          relatedBy:  NSLayoutRelationEqual,
          toItem:     view,
          attribute:  attribute,
          multiplier: 1.0,
          constant:   0.0
        )
      )
    end
  end

  def letter_label
    @letter_label ||= UILabel.new.tap do |label|
      label.font = UIFont.fontWithName('Helvetica', size: 96.0)
      label.translatesAutoresizingMaskIntoConstraints = false
    end
  end
end

routes.rb

# app/routes.rb

RoutesExample::Application.routes do |r|
  r.map('alphabet', controller: AlphabetController, resets: true, shared: true)
  r.map('letters/:letter', controller: LetterController)
end

routes_manager.rb

# app/routes_manager.rb

module RoutesExample
  module Application
    def self.routes
      @@instance ||= RoutesManager.new

      yield @@instance
    end

    class RoutesManager
      def map(key, options = {}, &block)
        router.map(key, options[:controller], options, &block)
      end

      private

      def router
        @router ||= Routable::Router.router
      end
    end
  end
end