Adding support for touch events

At present, the RestaurantDetailViewController class has an outlet, ratingsView, connected to a ratings view in the Restaurant Detail screen. It displays a rating of three and a half stars, but you can’t change the rating. You will need to support touch events to make the ratings view respond to taps.

You can learn more about handling touches at https://developer.apple.com/documentation/uikit/touches_presses_and_gestures/handling_touches_in_your_view.

To support touch events, you’ll modify the RatingsView class to track the user’s touches on screen and use them to determine the rating. Follow these steps:

1. Click the RatingsView file in the Project navigator and add the following property after the draw(_:) method:

   override var canBecomeFirstResponder: Bool {
      true
   }
   

   canBecomeFirstResponder is a UIControl property that determines whether an object can become the first...