ui_view_controller_example.rb

class MyGroupedListController < UIViewController
  attr_accessor :posts
  attr_accessor :sections
  
  class TableViewSection
    attr_accessor :title
    attr_accessor :items
    
    def initialize(params={})
      @title = params[:title]
      @items = params[:items]
    end
  end
  
  class TableViewSectionItem
    attr_accessor :label
    attr_accessor :details
    attr_accessor :object
    attr_accessor :selected
    
    def initialize(params={})
      @label = params[:label]
      @details = params[:details]
      @object = params[:object]
      @selected = params[:selected]
    end
  end
  
  def init
    if super
      self.tabBarItem = UITabBarItem.alloc.initWithTitle('Home', image:UIImage.imageNamed('list.png'), tag:1)
      self.posts ||= User.current_user.posts

      self.sections ||= []
      
      posts_section = self.games.map do |game| 
        TableViewSectionItem.new(
          :label => post.title, 
          :details => post.description,
          :object => post,
          :selected => Proc.new {
            @post_view_controller ||= PostViewController.alloc.init
            navigationController.pushViewController(@post_view_controller, animated:true)
            @post_view_controller.show_post(post)
          }
        )
      end
      self.sections[0] = TableViewSection.new(
        :title => "Posts", 
        :items => posts_section
      )
      
      from_draft_section_item = TableViewSectionItem.new(
        :label => "From Draft",
        :selected => Proc.new {
          puts "TODO: implement new post from draft (from the proc!)"
        }
      )
      
      from_scratch_section_item = TableViewSectionItem.new(
        :label => "From Scratch",
        :selected => Proc.new {
          post = Post.new(:author => User.current_user)
          @post_view_controller ||= PostViewController.alloc.init
          @post_view_controller.show_post_editor(post)
        }
      )
      
      self.sections[1] = TableViewSection.new(
        :title => "New Post",  
        :items => [from_scratch_section_item, from_draft_section_item]
      )
      
      logout_section_item = TableViewSectionItem.new(
        :label => "Logout",
        :selected => Proc.new {
          PFUser.logOut
          loggedOutViewController = LoggedOutViewController.alloc.init
          self.presentViewController(loggedOutViewController, animated:true, completion:nil)
        }
      )
      
      self.sections[2] = TableViewSection.new(
        :title => "Account", 
        :items => [logout_section_item]
      )
    end
    self
  end
  
  def viewDidLoad
    super
    view.backgroundColor = UIColor.whiteColor
    @myTableView = UITableView.alloc.initWithFrame(view.bounds, style:UITableViewStyleGrouped)
    @myTableView.dataSource = self
    @myTableView.delegate = self
    @myTableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
    view.addSubview(@myTableView)
  end
  
  def numberOfSectionsInTableView(tableView)
    self.sections.length
  end
  
  def tableView(tableView, titleForHeaderInSection:section)
    self.sections[section].title
  end
  
  def viewDidAppear(animated)
    super
  end
  
  def viewWillAppear(animated)
    navigationItem.title = "Home"
  end
  
  def viewDidUnload
    @myTableView = nil
  end
  
  def tableView(tableView, didSelectRowAtIndexPath:indexPath)
    section = self.sections[indexPath.section]
    item = section.items[indexPath.row]
    item.selected.call

  end
  
  # Sets the number of rows in each section
  def tableView(tableView, numberOfRowsInSection:section)
    section = self.sections[section]
    section.items.length
  end
  
  # Modifies each cell
  CellID = 'CellIdentifier'
  def tableView(tableView, cellForRowAtIndexPath:indexPath)
    cell = tableView.dequeueReusableCellWithIdentifier(CellID) || UITableViewCell.alloc.initWithStyle(UITableViewCellStyleSubtitle, reuseIdentifier:CellID)
    section = self.sections[indexPath.section]
    item = section.items[indexPath.row]
    cell.textLabel.text = item.label
    cell.detailTextLabel.text = item.details unless item.details.nil?
    cell    
  end
end