Hooking up our outlets

Let's now link our file, ExploreViewController, to our UIViewController in the storyboard:

1. While still in the Main.storyboard file, select the UIViewController with the Collection View that we just created, by clicking on the leftmost icon at the top of that controller:

2. In the Utilities Panel, select the Identity Inspector, which is the third icon from the left:

3. Under Custom Class, in the Class drop-down menu, choose ExploreViewController and hit the Enter key.
4. Select the Connections Inspector, the last icon on the right, in the Utilities Panel.
5. Under Outlets, you will see collectionView and an empty circle:

IBOutlet is a way to connect to a UI element. We have a Collection View on our UIViewController; now, we are hooking into that variable. Later in the book, you will learn how to create these variables.

6. Click on the collectionView circle...