Gist for my post core animation explained

core_animation_demo_1.swift

  demoView.frame = CGRectMake(0, 0, 100, 100)
  demoView.backgroundColor = UIColor.purpleColor()
  
  self.backgroundColor = UIColor.greenColor()
  
  UIView.animateWithDuration(5.0) { () -> Void in
      self.backgroundColor = UIColor.grayColor()
      self.demoView.center = CGPointMake(100, 100)
  }
  puts("foo bar")
}