Issues taking pictures with ZBarReader in landscape orientation and flat iPhone position

Question

I'm using ZBar to detect codes but also, I want to enable taking pictures from the same screen. I detected an odd behaviour taking pictures in landscape orientation. If I put my mobile in vertical landscape position the image comes out ok, but If I move my iPhone to the flat landscape position, the picture comes out upside down. I checked UIImage metadata and the image orientation has different values, despite the fact that the device orientation is the same in both cases.

Any idea why this happens?

Answer 1

My solution is to change the image orientation metadata in the wrong cases:

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[....]
            UIImage *image = [info objectForKey: UIImagePickerControllerOriginalImage];
            if(image){
                // This fixes a bug in ZBarReader taking picture in landscape orientation and device in flat position.
                NSLog(@"Image: %d, Device: %d",image.imageOrientation,self.interfaceOrientation);
                UIImageOrientation imgOrientation = image.imageOrientation;
                UIInterfaceOrientation interfaceOrientation = self.interfaceOrientation;
                if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft && imgOrientation == UIImageOrientationUp){
                    image = [UIImage imageWithCGImage:[image CGImage] scale:1.0 orientation:UIImageOrientationDown];
                }else if(interfaceOrientation == UIInterfaceOrientationLandscapeRight && imgOrientation == UIImageOrientationDown){
                    image = [UIImage imageWithCGImage:[image CGImage] scale:1.0 orientation:UIImageOrientationUp];
                }
                [self hideScanner];
                [self performSegueWithIdentifier:@"mySegue" sender:image];
            }
        }
    }

}