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

Buggy Simulator's main process is still working even after Xcode closing. So here're the steps:

1. Quit Xcode;
2. Kill com.apple.CoreSimulator.CoreSimulatorService process in Activity Monitor;
3. Launch Xcode and run your Playground.