How to use swift to detect app crash?

I am currently working on code to log a user's behavior in the app and to report crashes and the sequence leading up to them. I have one big problem, I do not know how to make my app detect if it has crashed. Does anybody know how to do this in swift? Your help would be much appreciated!

I don't think there is currently a way to do this. When your app crashes it ceases to function and all processes stop. Usually any crash and diagnostic data is sent via the user settings panel.

Edit: There is an helpful post here: https://stackoverflow.com/a/8242215/4891259

Hope that helps.