title: how to start a global thread in swift
body: <p>Is there any way to start and stop a thread in swift along with it making the thread global also so that it can used anywhere.</p>
  
  <p>As shown below, this is how i create thread in swift</p>
  
  <pre><code>var objThrd = SimpleClass()
  let thread = NSThread(target: objThrd , selector: "createSimpleObj", object: nil)
  </code></pre>
  
  <p>Please give an example if feasible. Or can we achieve this via NSOperation ?</p>