Changes

== Designing the View Controller User interfaces ==

In order to visually differentiate the two view controllers we will add labels to the views and change the background colors. If you are currently zoomed out of the canvas begin by zooming in (if the canvas is zoomed out it will not be possible to make changes to the views). Begin by selecting the view of the Tab1ViewController scene. Within the Attributes Inspector panel (View -> Utilities -> Show Attributes Inspector) click on the white rectangle next to the Background label and select a shade of red from the resulting Colors dialog. Next, drag and drop a Label object from the Object Library panel and position it in the center of the red view. Double click on the label so that it becomes editable and change the text to Screen One. With the label still selected, use the Auto Layout Align menu to establish Horizontal and Vertical Center in Container constraints.