I was using ZBar for scanning in iOS5 and it was working well.
Now after updating to iOS6, its not working. It shows a following error.
ld: fil
Came here with the same problem after downloading the tutorial code RDC provided in his blog. Very useful post, but the most helpful answer here was posted by RacZo on 3/29. I just downloaded the original ZBarSDK-1.3.1.dmg image, removed the ZBarSDK from my project and replaced with the original. Done.