Question

I am using this code to flip image.

CGAffineTransform trans = CGAffineTransformScale(imageView.transform, -1, 1);
imageView.transform = trans;  

Now if i want to save this flipped image what should i do ?
I am using UIImageWriteToSavedPhotosAlbum(imageView.image, nil, nil, nil); to save the image in iphone library but it is saving the original image not the flipped image.

Your suggestions are welcome guys.
Thank you for helping.

Answer 1

As You’re doing you’re flipping UIImageView on its X-Axis not UIImage. So obviously code would save your original image.

Flip your UIImage instead of UIImageView then save –

 UIImage *flippedImage = [UIImage imageWithCGImage:sourceImage.CGImage scale:1.0 orientation: UIImageOrientationUpMirrored];

Now use your saving method –

UIImageWriteToSavedPhotosAlbum(flippedImage, nil, nil, nil);

EDIT:

-(void)tapFlipXPosition:(id)sender
{
    UIImage* sourceImage = yourSourceImage;
    UIImage* flippedImage;

    if(sourceImage.imageOrientation == UIImageOrientationUpMirrored)
    {
       flippedImage = [UIImage imageWithCGImage:sourceImage.CGImage scale:1.0 orientation: UIImageOrientationUp];
    }
    else
    {
        flippedImage = [UIImage imageWithCGImage:sourceImage.CGImage scale:1.0 orientation: UIImageOrientationUpMirrored];
    }

    UIImageWriteToSavedPhotosAlbum(flippedImage, nil, nil, nil);
}