colors_controller.rb

class ColorsController < UIViewController
  def viewDidLoad
    super
    
    self.view.backgroundColor = UIColor.whiteColor

    @label = UILabel.alloc.initWithFrame(CGRectZero)
    @label.text = "Colors"
    @label.sizeToFit
    @label.center = [
                     self.view.frame.size.width / 2,
                     (self.view.frame.size.height - 80) / 2]
    @label.autoresizingMask =
      UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin
    self.view.addSubview @label

    self.title = "Colors"
    @colors = ["red", "green", "blue"]

    @colors.each_with_index do |color_text, index|
      color = color_named(color_text)
      button_width = 80

      button = UIButton.buttonWithType(UIButtonTypeRoundedRect)
      button.tag = index
      button.setTitle(color_text, forState:UIControlStateNormal)
      button.setTitleColor(color, forState:UIControlStateNormal)
      button.sizeToFit
      button.frame = [[30 + index*(button_width + 10),
                      self.view.frame.size.height / 2],
                      [80, button.frame.size.height]]
      button.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin

      button.addTarget(self, action: "tap_color:", forControlEvents:UIControlEventTouchUpInside)

      self.view.addSubview button
    end
  end

  def color_named(color_text)
    UIColor.send("#{color_text}Color")
  end

  def tap_color(sender)
    color = color_named(@colors[sender.tag])
    controller = ColorDetailController.alloc.initWithColor(color)
    self.navigationController.pushViewController(controller, animated: true)
  end

end