AV Foundation camera preview layer gets zoomed in, how to zoom out?

Question

The application currently I am using has a main functionality to scan QR/Bar codes continuously using Zxing library (http://code.google.com/p/zxing/). For continuous frame c

Answer 1

This is a function of the AVCaptureSession video preset, accessible by using the .sessionPreset property. For example, after configuring your captureSession, but before starting it, you would add

captureSession.sessionPreset = AVCaptureSessionPresetPhoto;

See the documentation here:

iOS Reference Document

The default preset for video is 1280x720 (I think) which is a lower resolution than the max supported by the camera. By using the "Photo" preset, you're getting the raw camera data.