How can I make the image always show the correct orientation?

Question

After taking image from camera in landscapeLeft and landscapeRight orientation, image save in landscape mode. Result image is attached.

Following is my code and all things I tried:

I am using PHPhotoLibrary to save image in custom album.

 // Take Image Button Method
 - (void)snapButtonPressed:(UIButton *)button
  {
  [self.camera capture:^(LLSimpleCamera *camera, UIImage *image,           NSDictionary *metadata, NSError *error)
        {
        if(!error)
          {

        NSString * info = [NSString stringWithFormat:@"Size: %@  -  Orientation: %ld", NSStringFromCGSize(image.size), (long)image.imageOrientation];
        NSLog(@"IMAGE Meta Data:%@",info);

        [CustomAlbum addNewAssetWithImage:image toAlbum:[CustomAlbum getMyAlbumWithName:CSAlbum] onSuccess:^(NSString *ImageId)
        {
            NSLog(@"IMAGE ID:%@",ImageId);
            recentImg = ImageId;
        }
           onError:^(NSError *error)
        {
            NSLog(@"probelm in saving image");
        }];
    }
    else
    {
        NSLog(@"An error has occured: %@", error);
    }
 }
      exactSeenImage:YES];
}

List item

You need to keep the exif information from the original pictures, but I haven't found any information to this regarding PHPhotoLibrary. MAybe you have better luck, now that you know that the problem is located in the loss of exif rotation information. — mondjunge, Jun 24 '16 at 08:40

score 1 · Answer 1 · answered Jun 24 '16 at 09:42

I have use this method to implement the fix image rotation, while capture the image from the camera. I think this is useful for you.

- (UIImage *) fixrotation:(UIImage *)image {


if (image.imageOrientation == UIImageOrientationUp) return image;
CGAffineTransform transform = CGAffineTransformIdentity;

switch (image.imageOrientation) {
    case UIImageOrientationDown:
    case UIImageOrientationDownMirrored:
        transform = CGAffineTransformTranslate(transform, image.size.width, image.size.height);
        transform = CGAffineTransformRotate(transform, M_PI);
        break;

    case UIImageOrientationLeft:
    case UIImageOrientationLeftMirrored:
        transform = CGAffineTransformTranslate(transform, image.size.width, 0);
        transform = CGAffineTransformRotate(transform, M_PI_2);
        break;

    case UIImageOrientationRight:
    case UIImageOrientationRightMirrored:
        transform = CGAffineTransformTranslate(transform, 0, image.size.height);
        transform = CGAffineTransformRotate(transform, -M_PI_2);
        break;
    case UIImageOrientationUp:
    case UIImageOrientationUpMirrored:
        break;
}

switch (image.imageOrientation) {
    case UIImageOrientationUpMirrored:
    case UIImageOrientationDownMirrored:
        transform = CGAffineTransformTranslate(transform, image.size.width, 0);
        transform = CGAffineTransformScale(transform, -1, 1);
        break;

    case UIImageOrientationLeftMirrored:
    case UIImageOrientationRightMirrored:
        transform = CGAffineTransformTranslate(transform, image.size.height, 0);
        transform = CGAffineTransformScale(transform, -1, 1);
        break;
    case UIImageOrientationUp:
    case UIImageOrientationDown:
    case UIImageOrientationLeft:
    case UIImageOrientationRight:
        break;
}

// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, image.size.width, image.size.height,
                                         CGImageGetBitsPerComponent(image.CGImage), 0,
                                         CGImageGetColorSpace(image.CGImage),
                                         CGImageGetBitmapInfo(image.CGImage));
CGContextConcatCTM(ctx, transform);
switch (image.imageOrientation) {
    case UIImageOrientationLeft:
    case UIImageOrientationLeftMirrored:
    case UIImageOrientationRight:
    case UIImageOrientationRightMirrored:
        // Grr...
        CGContextDrawImage(ctx, CGRectMake(0,0,image.size.height,image.size.width), image.CGImage);
        break;

    default:
        CGContextDrawImage(ctx, CGRectMake(0,0,image.size.width,image.size.height), image.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;

 }

How can I make the image always show the correct orientation?

1 Answers1