This project explores and demonstrates the use of AVFoundation to read QR codes and to take photos.
Project contains 3 classes that encapsulate the corresponding functionality and hide details of the interaction with AVFoundation.
class QRCaptureSession
class PhotoCaptureSession
class QR_and_PhotoCaptureSession
Client code, typically a ViewController, instantiates one of these classes, provides the delegate(s) for the session to return the captured items (QR code string or image).
QR_or_PhotoCaptureViewController instantiates alternately a QRCaptureSession and a PhotoCaptureSession, to perform the QR capture and the photo capture, repectively.
QR_and_PhotoCaptureViewController instantiates a QR_and_PhotoCaptureSession which can perform both captures on the same video stream from the iOS device's back camera. This results in a smooth transition between the two modes of operation.