title: dismissViewControllerAnimated completion block presenter view and modal view flow
body: <p>I did find an answer to this title and I did do a little research but I'm still not getting the flow. Here is what I want to happen:</p>
  
  <p>1) click a button on the presenter view to open a modal view. 2) retrieve some value and click a button to close the modal view....sending the value to the presentor view and execute a method.</p>
  
  <p>I get that this works like a callback but I still can't figure out where to put the callback stuff.</p>
  
  <p>So, how exactly do I do this? A) In the presentViewController completion block, should I include the presenter view method to execute when modal view is completed?</p>
  
  <p>Or: B) In the modal view's dismissViewControllerAnimated completion block, should I include the presenter view method to execute when modal view is completed?</p>
  
  <p>Can somebody help me with some sample code? Or at least help me get the flow of which block to put the code in?</p>
  
  <p>Thank you, P</p>