Changes

The final step in developing our application is to connect the actions and outlets we have declared in the view controller class to the actual objects in the user interface view. Fortunately, this can all be done visually from within the Interface Builder tool.

With this in mind, select the UnitConverterViewController.xib file to load the user interface into Interface Builder. We will begin by connecting the IBOutlet instance variables we created in our view controller class to the label and text field objects respectively. Located in the narrow panel to the left of the graphical view of the user interface are three icons. Clicking on the grey circle containing a white arrow at the bottom of this panel will expand the panel to provide more detail if it is not already expanded: