Saving scaled UUImage to default Document folder in SwiftUI - swift

Question

I'm trying to save a scaled UUImage in default Document folder in the SwiftUI world. In particular I would like to resize the image before saving it. The flow is: the user takes a picture and at some point this picture is saved. Regardless of its size, its width should be 512 px and its height will be calculated keeping the aspect ratio. I wrote a function to resize the picture before save it and if I debug, the original picture's size is changed correctly but after I save it in document folder, the width and height are completely different. What am i doing wrong?
this is my function that resizes the image:
extension UIImage {
func imageResized(to size: CGSize) -> UIImage {
return UIGraphicsImageRenderer(size: size).image { _ in
draw(in: CGRect(origin: .zero, size: size))
}
}
}
this is my function that resize and save the picture:
func saveImageToDocuments(imageName: String, image: UIImage) -> String? {
guard let directoryToSave = getOrCreateCurrentMonthYearFolder() else { return nil }
let absolutePath = directoryToSave.absoluteString
let tokens = absolutePath.split(separator: "/")
let relativePath = String(tokens[tokens.count-2]) + "/" + (String(tokens[tokens.count-1]))
let fileURL = directoryToSave.appendingPathComponent(imageName)
let newHeight = (image.size.height * 512) / image.size.width;
let cgSize= CGSize(width: 512, height: newHeight)
let resizedImage = image.imageResized(to: cgSize)
guard let data = resizedImage.jpegData(compressionQuality: 0.5) else { return nil }
do {
try data.write(to: fileURL, options: .atomic)
print("Immagine salvata")
return relativePath
} catch let error {
print("error saving file with error", error)
return nil
}
}