gistfile1.rb

class ImagesScreen < PM::CollectionScreen
  collection_layout UICollectionViewFlowLayout
  collection_cell   ImagesCell
  cell_identifier   'images_cell'
  cell_width        78.5
  cell_height       78.5
  title             'Images'

  attr_accessor :board, :thread

  def on_load
    @client = Singleton.instance
    get_images
  end

  def collection_data
    [{ :cells => Array(@thumbnails) }]
  end

  def get_images
    @client.json_client.fetch("/#{board}/res/#{thread}.json") do |response|
      @images = response['posts'].each.inject({
                    :cells => [], :list => [], :index => 0
                  }) do |img,(post,i)|
        if post.has_key?('tim')
          img[:cells] << {
            :cell_identifier => self.class.cell_identifier,
            :action          => :tap_image,
            :arguments       => { :index => img[:index] },
            :thumbnail       => {
              :url => @client.thumb_client.thumbnail(board, post['tim'])
            },
          }
          
          img[:list]  << @client.image_client.image(board, post['tim'], post['ext'])
          img[:index] += 1
        end ; img
      end

      @thumbnails = @images[:cells]

      update_collection_data
    end
  end

  def tap_image(args={})
    open_modal ImageScreen.new(args.merge(:nav_bar => true,
                                          :images  => @images[:list]))
  end

end