Ans. Switch to macOS platform
When you create a Playground, by default it select iOS platform and automatically imports UIKit. It’s the UIKit which crashes and stuck all the time. If your (practice) code does not use UIKit then you can switch to MacOS platform. As major (not exact though) difference between iOS and macOS is in APPKit and UIKit.
In the upper right corner of your Xcode Playground, click on show/hide Utilities–> file inspector –> Playground Setting–> Platform–> macOS
See screenShot below:
