title: Secret QR Code - Only read by my own scanner app
body: <p>I am working on a social app like Instagram, Snap Chat, and Facebook. I need to generate a QR code of user profiles. I have hidden user ids from the database. I have a scanner in my app to scan the QR code. The functionality is working fine. </p>
  
  <p>But when my generated QR codes are read by other scanner apps, like the iOS default scanner, it reads the user id (string, text) from the QR code. </p>
  
  <p>I have used Swift default code for QR code generation.</p>
  
  <p>QR code read only by my app. </p>
  
  <p>Like Snap Chat, Messenger, etc.</p>