Image resizing using CGImageSourceCreateThumbnailAtIndex should maintain rotation

[v-ken]

Article: https://github.com/NSHipster/articles/blob/master/2014-09-15-image-resizing.md

import ImageIO

if let imageSource = CGImageSourceCreateWithURL(self.URL, nil) {
    let options: [NSString: NSObject] = [
        kCGImageSourceThumbnailMaxPixelSize: max(size.width, size.height) / 2.0,
        kCGImageSourceCreateThumbnailFromImageAlways: true
    ]

    let scaledImage = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options).flatMap { UIImage(CGImage: $0) }
}

Should include kCGImageSourceCreateThumbnailWithTransform: true in the options dictionary. Otherwise, the image result will appear rotated when an image is taken from camera in the portrait orientation.

import ImageIO

if let imageSource = CGImageSourceCreateWithURL(self.URL, nil) {
    let options: [NSString: NSObject] = [
        kCGImageSourceThumbnailMaxPixelSize: max(size.width, size.height) / 2.0,
        kCGImageSourceCreateThumbnailFromImageAlways: true,
        kCGImageSourceCreateThumbnailWithTransform: true
    ]

    let scaledImage = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options).flatMap { UIImage(CGImage: $0) }
}

[Ruberik]

Thank you for posting this; I was having the problem that your fix fixes.