Robuta

https://lapcatsoftware.com/articles/nsnotificationcenter-is-threadsafe-not.html NSNotificationCenter is thread-safe NOT nsnotificationcenter thread safe https://mjtsai.com/blog/2015/08/26/safer-block-based-nsnotificationcenter-api/ Michael Tsai - Blog - Safer Block-based NSNotificationCenter API michael tsai blog safer block based