Project Titan (autonomous vehicle group) is about to lay off over 200 people. Some have been offered positions in other groups but ultimately 200 will be leaving the company - some work will be moved to the ML/AI groups, but this is if for Project Titan. There were cuts in 2016 when my wife was laid off - so this is the second round.
Not sure about other layoffs at Apple, I have many friends that work there and their jobs are pretty stable (long hours tho).
Hope this helps.