title: NSTimer target and userInfo parameter questions
body: <p>I've read around SO as well as looked at the Apple documentation for the NSTimer class, and it seems like the easiest way to create a timer is by using the following method:</p>
  
  <pre><code>[NSTimer scheduledTimerWithTimeInterval:15.0
                                   target:self
                                 selector:@selector(fireThisMethod:)
                                 userInfo:nil
                                  repeats:NO];
  </code></pre>
  
  <p>I understand that this will create a timer that fires after 15 seconds.  The method that will be fired will be whatever method is passed into the "selector" (in this case "fireThisMethod").  Since the "repeats" is "NO," this means that it will only be fired once.  My questions are:</p>
  
  <p>1)  Is it possible to pass in a method to "selector" that has more than one parameter?  I've seen methods without any parameters, or in this case 1 (since a ":" is present after the method name).  A method such as fireThisMethod:anotherParameter:?</p>
  
  <p>2)  I'm not sure if I truly understand what the "target" and "userInfo" parameters are for.  Will you ever have a "target" that isn't "self?"  Will you have a "userInfo" that isn't nil?  If so, in what scenarios?</p>
  
  <p>Thanks</p>