iOS - UIImageView - how to handle UIImage image orientation

Question

Is it possible to setup UIImageView to handle image orientation? When I set the UIImageView to image with orientation RIGHT (it is photo from camera roll), the image is rotated to right, but I want to show it in proper orientation, as it was taken.

I know I can rotate image data but it is possible to do it more elegant?

Answer 1

If I understand, what you want to do is disregard the orientation of the UIImage? If so then you could do this:

UIImage *originalImage = [... whatever ...];  UIImage *imageToDisplay =      [UIImage imageWithCGImage:[originalImage CGImage]               scale:[originalImage scale]               orientation: UIImageOrientationUp]; 

So you're creating a new UIImage with the same pixel data as the original (referenced via its CGImage property) but you're specifying an orientation that doesn't rotate the data.

Answer 2

You can completely avoid manually doing the transforms and scaling yourself, as suggested by an0 in this answer here:

- (UIImage *)normalizedImage {     if (self.imageOrientation == UIImageOrientationUp) return self;       UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);     [self drawInRect:(CGRect){0, 0, self.size}];     UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();     return normalizedImage; } 

The documentation for the UIImage methods size and drawInRect explicitly states that they take into account orientation.