Restaurant listing

For our restaurant listing page, we want a one-column grid on all phones and a two-column grid on all iPads. If you build and run the project by hitting the Play button (or by using command + R) and go to a restaurant listing page, you will see that we need to fix the spacing on the iPad to show two columns correctly:

Let's see how we can fix this. Remember that we still want one column on the iPhone and a grid on the iPad. Open the RestaurantListViewController.swift file and add the following above the createData() method inside of the private extension:

func initialize() {
   createData()
   setupTitle()
   if Device.isPad{ setupCollectionView() }
}

You will get an error for the setupCollectionView() method. Ignore it for now, as we will fix this shortly. This method checks whether the device is an iPad; if it is, it calls the setupCollectionView() method...