title: How to get custom Push Notification value from launchOptions with swift?
body: <p>I'm building an app with Swift that receives push notifications. I am sending custom values inside the JSON. </p>
  
  <p>I am opening the app through the notification, so I know that I have to do this inside "didFinishLaunchingWithOptions" and read the value from "launchOptions".</p>
  
  <p>How can I read those values and use them on my app.</p>
  
  <p>Many thanks.</p>