Should I use UIImage or CGImage in a Swift iOS App?

Question

All the code I can find revolves around loading images directly into visual controls.

However, I have my own cache system (converting a project from another language

Answer 1

Per the documentation at: https://developer.apple.com/documentation/uikit/uiimage

let uiImage = uiImageView.image
let cgImage = uiImage.cgImage