UIAlertActionStyle has been renamed to UIAlertAction.Style

  //4.0 Notification.Name.UIKeyboardWillHide //change to //4.2 UIResponder.keyboardWillHideNotification //4.0 Notification.Name.UIKeyboardWillChangeFrame //4.2 UIResponder.keyboardWillChangeFrameNotification //4.0 Notification.Name.UIApplicationWillResignActive //4.2 UIApplication.willResignActiveNotification //4.0 let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue //4.2 let keyboardScreenEndFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue