问题
We have implemented a QRCode reading function in iOS using the AVCaptureSession class, as described nicely here:
https://github.com/HEmobile/ScanBarCode/tree/master/ScanBarCodes https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVCaptureSession_Class/
But one thing we notice... the QRCode has to be aligned exactly vertically or horizontally. Oblique angles such as 45 degress does not trigger a scan. This issue doesn't really google, which is surprising.
Our experiments with other QRcode reading apps indicate that this limitation does not exist. Perhaps/seemingly (presumably -- since the built-in function is new) these apps don't use AVCaptureSession.
Our question is, is this a sign that Apple's version of this function is not mature yet? Or is there some option to enable or improve this capability?
Thanks for any thoughts.
回答1:
It seems you've written some sort of limitation in your code. Check out my github repo: https://github.com/alexekoren/qr-3d
It was built specifically for reading QR Codes at angles in a pretty way. I'm testing it now and it pulls at 30-45 degrees easily.
Here's the direct link for everything you'll need to make the scanner object that can present on a UIView: https://github.com/AlexEKoren/QR-3D/blob/master/Code%20Scanner/Scanner/CSScanner.m
It should work out of the box!
来源：https://stackoverflow.com/questions/31972705/reading-on-qrcodes-on-ios-with-avcapturesession-alignment-issues