Xcode playground gets stuck on 'Running playground' or 'Launching simulator' and won't run the code, what to do?

Question

Every time I create a new playground in order to test some code, Xcode gets stuck and won\'t run the code. It simply presents \'Running playground\' or \'Launching simulator

Answer 1

In my case, Xcode 8.3.2, it works when I try as steps below:

1. File -> Close "Name.playground"
2. File -> Close Playground
3. Quit Xcode
4. Re-open Xcode