title: How to scan Qr code from an image picked with UIImagePickerController in iOS
body: <p>I am able to scan qr code with camera without using any external libraries like ZBAR or ZXING.</p>
  
  <p>Now what I actually want is to let the user upload an image from photo library and get the qr code scanned from that uploaded image.</p>
  
  <p>I know how to use UIImagePickerController (used it before).</p>
  
  <p>What I want to ask is that,
  How can I scan qr code from an uploaded image (without using the camera)</p>
  
  <p>You can suggest some code (.h / .m files) that I can add in my project.</p>
  
  <p>Please don't suggest me any external libraries like ZBAR or ZXING.</p>