add Timer sample

Timer/README

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+Timer.app
+
+This sample demonstrates the following concepts: Timer, Label, Button.

Timer/Rakefile

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+$:.unshift("/Library/Motion/lib")
+require 'motion/project'
+
+Motion::Project::App.setup do |app|
+  # Use `rake config' to see complete project settings.
+  app.name = 'Timer'
+end

Timer/app/app_delegate.rb

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+class AppDelegate
+  def application(application, didFinishLaunchingWithOptions:launchOptions)
+    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
+    @window.rootViewController = TimerController.alloc.init
+    @window.rootViewController.wantsFullScreenLayout = true
+    @window.makeKeyAndVisible
+    true
+  end
+end

Timer/app/timer_controller.rb

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+class TimerController < UIViewController
+  def viewDidLoad
+    margin = 20
+
+    @state = UILabel.new
+    @state.font = UIFont.systemFontOfSize(30)
+    @state.text = 'Tap to start'
+    @state.textAlignment = UITextAlignmentCenter
+    @state.textColor = UIColor.whiteColor
+    @state.backgroundColor = UIColor.clearColor
+    @state.frame = [[margin, 200], [view.frame.size.width - margin * 2, 40]]
+    view.addSubview(@state)
+
+    @action = UIButton.buttonWithType(UIButtonTypeRoundedRect)
+    @action.setTitle('Start', forState:UIControlStateNormal)
+    @action.setTitle('Stop', forState:UIControlStateSelected)
+    @action.addTarget(self, action:'actionTapped', forControlEvents:UIControlEventTouchUpInside)
+    @action.frame = [[margin, 260], [view.frame.size.width - margin * 2, 40]]
+    view.addSubview(@action)
+  end
+
+  def actionTapped
+    if @timer
+      @timer.invalidate
+      @timer = nil
+    else
+      @duration = 0
+      @timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target:self, selector:'timerFired', userInfo:nil, repeats:true)
+    end
+    @action.selected = !@action.selected?
+  end
+
+  def timerFired
+    @state.text = "%.1f" % (@duration += 0.1)
+  end
+end

Timer/spec/main_spec.rb

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+describe "Application 'Timer'" do
+  before do
+    @app = UIApplication.sharedApplication
+  end
+
+  it "has one window" do
+    @app.windows.size.should == 1
+  end
+end