zxing模式下不能扫出本地二维码

[isdotjim]

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[llwj0303]

请问解决了吗，亲

[llwj0303]

自己解决了，算是库的一个BUG吧，写给需要的人😄

• (void)recognizeImage:(UIImage )image block:(void (^)(ZXBarcodeFormat barcodeFormat, NSString str... 函数中一开始将image旋转后再继续用， UIImage *fixImage = [self fixOrientation:image];// 必须旋转90度才能进行解码

fixOrientation函数如下：

• (UIImage )fixOrientation:(UIImage )aImage { // No-op if the orientation is already correct

  if (aImage.imageOrientation == UIImageOrientationUp) return aImage;

  // We need to calculate the proper transformation to make the image upright.

  // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.

  CGAffineTransform transform = CGAffineTransformIdentity;

  switch (aImage.imageOrientation) { case UIImageOrientationDown:

  case UIImageOrientationDownMirrored:
  
      transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
  
      transform = CGAffineTransformRotate(transform, M_PI);
  
      break;
  
  case UIImageOrientationLeft:
  
  case UIImageOrientationLeftMirrored:
  
      transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
  
      transform = CGAffineTransformRotate(transform, M_PI_2);
  
      break;
  
  case UIImageOrientationRight:
  
  case UIImageOrientationRightMirrored:
  
      transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
  
      transform = CGAffineTransformRotate(transform, -M_PI_2);
  
      break;
  
  default:
  
      break;

  }

  switch (aImage.imageOrientation) { case UIImageOrientationUpMirrored:

  case UIImageOrientationDownMirrored:
  
      transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
  
      transform = CGAffineTransformScale(transform, -1, 1);
  
      break;
  
  case UIImageOrientationLeftMirrored:
  
  case UIImageOrientationRightMirrored:
  
      transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
  
      transform = CGAffineTransformScale(transform, -1, 1);
  
      break;
  
  default:
  
      break;

  }

// Now we draw the underlying CGImage into a new context, applying the transform

// calculated above.

CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,

                                         CGImageGetBitsPerComponent(aImage.CGImage), 0,

                                         CGImageGetColorSpace(aImage.CGImage),

                                         CGImageGetBitmapInfo(aImage.CGImage));

CGContextConcatCTM(ctx, transform);

switch (aImage.imageOrientation) {
    case UIImageOrientationLeft:

    case UIImageOrientationLeftMirrored:

    case UIImageOrientationRight:

    case UIImageOrientationRightMirrored:

// Grr...

        CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.height, aImage.size.width), aImage.CGImage);

        break;

    default:

        CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.width, aImage.size.height), aImage.CGImage);

        break;
}

// And now we just create a new UIImage from the drawing context

CGImageRef cgimg = CGBitmapContextCreateImage(ctx);

UIImage *img = [UIImage imageWithCGImage:cgimg];

CGContextRelease(ctx);

CGImageRelease(cgimg);

return img;

}