I am a huge fan of https://makeappicon.com, I use it for almost every iOS app I have to.
Unfortunately, they have to update their Assets for Watch, Watch Extension and Watch Complication for Watch OS 4 and Xcode 9.
While waiting for them to fix their scripts, I developed this tiny ruby script which generates the Assets correctly for Watch OS 4.
USAGE
- Download or clone the repo.
- Place your app icon PNG file into the main folder and rename it to 1024p.png.
- Open a terminal window.
- Run: ruby script.rb.
- Check your main folder, an Assets.xcassets folder should be there containing your desired icons.
- Copy-paste-replace your Assets.xcassets with the generated one.
- DONE!