I recently shared in the Figma Community an easy way to generate iOS and macOS app icons for Xcode 14.
Apple recently changed how to make iOS icons in Xcode. Now you only need to use a single, square 1024x1024 image. (Xcode still lets you do it the old way, if needed.)
Mac icons still need to be manually generated for each size. They also need to include padding, rounded corners, and drop shadows.
The file includes instructions and an app icon grid.