I recently found this App called Icon Set Creator in the App Store which is free, without ads, updated on new changes, straight forward and works just fine for every possible icon size in OSX, iOS and WatchOS:
In Icon Set Creator:
- Drag your image into the view
- Choose your target platform
- Export the Icon Set folder
In XCode:
- Navigate to the Assets.xcassets Folder
- Delete the pre existing AppIcon
- Right click -> Import your created Icon-Set as AppIcon and you’re done
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