swift-coregraphics-image

Swift package providing a common interface for derive CGImage instances from URL instances in both an AppKit and UIKit context.

Example

import CoreGraphicsImage

let im_url = URL(string: "file:///path/to/image.jpg")
let im_rsp = CoreGraphicsImage.LoadFromURL(url: im_url)
     
if case .success(let cg_image) = im_rsp {
    // do something with cg_image here
}

Motivation

SFO Museum often writes tools in Swift that we would like to run in both a MacOS (AppKit) and iOS (UIKit) contexts. Because each respective framework has its own image type (NSImage and UIImage respectively) and each framework is specific to their respective platform this can result in a lot of fiddly-code when cross-compiling applications.

This package provides a single method (LoadFromURL) which accepts a URL instance and returns a CoreGraphics CGImage instance for the image at that location, regardless of platform.

That's all it does. How many people have already written this code? I'd wager a lot of people have. Now we have too.

See also

• https://developer.apple.com/documentation/appkit/nsimage
• https://developer.apple.com/documentation/uikit/uiimage
• https://developer.apple.com/documentation/coregraphics/cgimage
• https://developer.apple.com/documentation/foundation/url