What is Main Thread Checker in Xcode

Question

I checked what\'s new in Xcode 9 documentation and I found this

But i didn\'t understand what is that how I can use this with new Xcode 9.

Answer 1

It can be enabled/disabled in the diagnostics option of the scheme. Besides, the "Pause on issues" is a comfortable option to debug these problems.

Xcode 11

Xcode <11