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

I have tried the following and it worked for me:

1. press on the bottom "stop playground" button
2. remove the first comment line and make import statement the first line. no space above import.
3. press execute button