title: How to reference a a secondary view upon launch of initial view Swift 2, Xcode 7
body: <p>What I want to do is have two views, and the initial view references something, say a UISwitch, in the second view upon the launch of the initial view.</p>
  
  <p>For example:
  Two views, each with different associated view controllers.
  The first view has, say, a label.
  The second one has a UISwitch.
  When the app runs on an iPhone, if the switch is on, the label says "Switch is on", same if off.
  <strong>But I want the label to change based on the switch on the second view, before the initial view loads. I keep getting an error that says "error: found nil while unwrapping an optional" I don't want to have to go to the second view, I just want the initial view to reference the switch on the second view, in the initial view's viewDidLoad</strong></p>