losing image quality while converting base 64 - ios

Question

I have one pdf and I am converting pdf to image and displaying in UIImageView and then after I am converting that image to base 64 but while converting base 64 I am losing the image quality so is there any way to prevent from losing quality while converting to base 64
please tell me is there any solution for that
here is my code for convert
let previewImage1 = convertedImageView.getImage()
let btnImg = UIButton()
btnImg.setImage(previewImage1, for: .normal)
let btn1Imggg2 = btnImg.image(for: .normal)
let imageData2 = btnImg?.jpegData(compressionQuality: 0.0)
let imgString2 = imageData2!.base64EncodedString(options: .init(rawValue: 0))
Even if i set compress quality to 0.0 still its compressing image
i have UIView Inside that i have ScrollView inside that i have ImageView and i am converting whole UIView as image and then convert into base64 the is the scenario hope this help you to understand
Code For UIView To UIImage
func getImage(scale: CGFloat? = nil) -> UIImage {
let newScale = scale ?? UIScreen.main.scale
self.scale(by: newScale)
let format = UIGraphicsImageRendererFormat()
format.scale = newScale
let renderer = UIGraphicsImageRenderer(size: self.bounds.size, format: format)
let image = renderer.image { rendererContext in
self.layer.render(in: rendererContext.cgContext)
}
return image
}

Answer 1

By doing this
let imageData2 = btnImg?.jpegData(compressionQuality: 0.0)
you are compressing the image with the maximum value possible. Change this code to
let imageData2 = btnImg?.jpegData(compressionQuality: 1.0)
and you will be good to go.
As you are converting the UIView to UIImage below function can be useful to you :
func image(with view: UIView) -> UIImage? {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.isOpaque, 0.0)
defer { UIGraphicsEndImageContext() }
if let context = UIGraphicsGetCurrentContext() {
view.layer.render(in: context)
let image = UIGraphicsGetImageFromCurrentImageContext()
return image
}
return nil
}
If the jpeg data does not suffice your requirement the user pngData like this
let imageData2 = btnImg?.pngData()
After getting the conversion to Image apply the base64 conversion as you are doing right now.

Answer 2

Okay, since you have a nested hierarchy (UIView -> UIScrollView -> UIImageView) and you wan't to capture that whole hierarchy as an image, it would be better to make an image from UIView (the topmost in the hierarchy, unless I understood wrong and you wan't the UIImageView part only)
let parentMostView = (the view you want to create into an image)
UIGraphicsBeginImageContextWithOptions(size: parentMostView.frame.size, NO, UIScreen.main.scale)
let image = UIGraphicsGetImageFromCurrentImageContext()!
UIGrapgicsEndImageContext()
let imageAsData = image.pngData()
//do your base64 conversion here
EDITED: Upon seeing your image creation code
I don't see any issues in your getImage(:) method. On what device are you testing(lower scale devices would create low resolution images because you are dependent on Device scale)? Try using a high static scale value(e.g 10) and replace Data conversion to .jpegData(compressionQuality: 1.0) or .pngData()