Snackbar on main VC, then Snackbar on modal VC, crash on cleanup as returns to main VC

[adamjack]

I've had a pretty awkward to debug (i.e. no useful stack trace) issue which I think I've tracked down to my usage SSSnackbar. I love the view, I like how it allows me to message the user w/o getting in the way, so I use it a lot. I'd not put two and two together, at first, but I have this:

• Main view does a SSSnackbar on startup of VC saying something.
• Optionally a user presents a modal view (on iPhone, over whole window) and that VC uses a SSSnackbar to message.
• If the user exits the modal before the second SSSnackbar is done (I think this is important) and returns to the main view (that raises a snackbar) then the app crashes on the code to cleanup the SSSnackbar.

I know I'll get a little less snackbar happy (it was just initial code and I'd not realized how it works in reality) but I think this is the issue:

• Modal creates a SSSnackbar (so a different VC hierarchy?)
• Modal goes away (tearing down SSSnackbar but it not clearing currentlyVisibleSnackbar)
• Main VC tries to show and tries to replace existing SSSnackbar, but crashes on accessing currentlyVisibleSnackbar.

Even though my case might be a bit noisy, I can imagine this scenario occurring in some cases (where user is bounding around.)

Any thoughts on how to debug this, and what the best approach to fix this is? I know there have been tweaks / fixes for the modal VC hierarchy before, and wonder if another is possible / needed.

Thanks in advance, and I can supply more details if needed.