Using the new iOS7 AVMetadataMachineReadableCodeObject Class to decode QR-Codes and other within a small rubymotion project. I could not find any examples therefore created one myself.
The AVCaptureMetadataOutput delegates to captureOutput:didOutputMetadataObjects:fromConnection:
just rake device (does not work in the simulator).
props go to joe noon @joenoon for pointing out a queue mistake.