title: iPhone UISwitch react with another UISwitch
body: <p>I've read all about UISwitches already but I cannot seem to figure them out in my situation.
  I have 2 UISwitches. In order for my code to work only one of them can be ON. How would I accomplish this? </p>
  
  <p>So far i've tried...</p>
  
  <p><strong>MyClass.h</strong></p>
  
  <pre><code>-(IBAction)sufSwitchChanged:(id)sender;
  </code></pre>
  
  <p><strong>MyClass.m</strong></p>
  
  <pre><code>-(IBAction)preSwitchChanged:(id)sender {
  UISwitch *whichSwitch = (UISwitch *)sender;
  BOOL setting = whichSwitch.isOn;
  [newsPre setOn:setting animated:YES];
  [techPre setOn:setting animated:YES];
  }
  </code></pre>
  
  <p>....which worked but it made both switches ON or OFF. I just need to figure out how to prevent them from both being ON at the same time. </p>