app_delegate.rb

# -*- coding: utf-8 -*-
class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @window.rootViewController = UINavigationController.alloc.initWithRootViewController(
      MainViewController.new
    )
    @window.makeKeyAndVisible

    watch_clipboard
    true
  end

  def applicationWillEnterForeground(application)
    watch_clipboard
  end

  def watch_clipboard
    pasteboard = UIPasteboard.generalPasteboard
    url = pasteboard.URL

    if string = pasteboard.string
      if matches = string.match(%r{(https?://.*)})
        notify = NSNotification.notificationWithName(
          "foundURLInPasteboard",
          object:self,
          userInfo:{ :url => NSURL.URLWithString(matches[1]) }
        )
        NSNotificationCenter.defaultCenter.postNotification(notify)
      end
    end
  end
end

class MainViewController < UIViewController
  def viewDidLoad
    super
    self.title = "Main"
    self.edgesForExtendedLayout = UIRectEdgeNone
    self.view.backgroundColor = UIColor.whiteColor

    # ちゃんとするなら removeObserver もしてね
    center = NSNotificationCenter.defaultCenter
    center.addObserver(
      self, selector:"foundURLInPasteboard:", name:"foundURLInPasteboard", object:nil
    )
  end

  def foundURLInPasteboard(center)
    url = center.userInfo[:url]
    notificationView = DMRNotificationView.alloc.initWithTitle(
      "URLみっけ", subTitle:url.absoluteString, targetView:self.view
    )
    notificationView.setDidTapHandler(
      lambda do
        controller = WebViewController.new
        controller.url = url
        self.navigationController.pushViewController(controller, animated:true)
      end
    )
    notificationView.showAnimated(true)
  end
end

# 実装超適当
class WebViewController < UIViewController
  attr_accessor :url
  def viewDidLoad
    super
    @webview = UIWebView.new.tap do |v|
      v.scalesPageToFit = true
      v.loadRequest(NSURLRequest.requestWithURL(url))
      v.frame = view.frame
      v.delegate = self
    end
    self.view.addSubview(@webview)
  end
end