title: use a switch to change background color in XCode
body: <p>I'm essentially brand new to developing iOS in XCode, so this is probably a really simply question. I want to know how I can change the background color of my View Controller using a simple switch- in other words, how do I make it so that when a switch is tapped, the background is no longer white? I know how to do this in the interface builder, but it's not interactive. </p>