Describe the feature and motivation

For a couple of days, I was stuck debugging my program due to default Xcode build settings modifying my .png template images. I only knew was that my path was good and that cv.imread gave me an empty Mat.

While iOS pack 4.11 did not give me any useful messages about the problem, iOS pack 4.10 did. I would just like to suggest bringing back the log message: "libpng error: CgBI: unhandled critical chunk" or something similar. After fixing the problem both iOS packs function correctly. I feel this would help others

Thank you

Additional context

Helpful as a more recent Swift/Xcode programmer but a more comfortable OpenCV user