UIImagePickerController Fix Orientation （Source: http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload)

UIImage+fixOrientation.h

@interface UIImage (fixOrientation)

- (UIImage *)fixOrientation;

@end

UIImage+fixOrientation.m

@implementation UIImage (fixOrientation)

- (UIImage *)fixOrientation {

    // No-op if the orientation is already correct
    if (self.imageOrientation == UIImageOrientationUp) return self;

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

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

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

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

        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, self.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
    }

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

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

@end

UIImagefixOrientation.h

@interface UIImage (fixOrientation)

- (UIImage *)fixOrientation;

@end

UIImagefixOrientation.m

@implementation UIImage (fixOrientation)

- (UIImage *)fixOrientation {

    // No-op if the orientation is already correct
    if (self.imageOrientation == UIImageOrientationUp) return self;

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

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

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

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

        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, self.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
    }

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

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

@end

Hi, same memory problem here (a huge memory peak).
Anybody knows the way to avoid this peak?

like this
it takes the same memory!

• (UIImage )imageRotate:(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;
  default:
      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;
  default:
      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;
  

  }

  CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
  *image = [UIImage imageWithCGImage:cgimg];
  CGContextRelease(ctx);
  CGImageRelease(cgimg);
  return *image;
  }

Is it available via CocoaPods?

• (UIImage *)imageWithCGImage:(CGImageRef)cgImage scale:(CGFloat)scale orientation:(UIImageOrientation)orientation NS_AVAILABLE_IOS(4_0);
  use this, it work