How to prevent present modally an active controller?

Question

We have 2 controllers: MainVC and ProfileVC. From MainVC we go to ProfileVC with profileButton press (left item on navigation bar).

In Profile VC we hav

Answer 1

I think u will need to dismiss the LAST viewcontroller first before going back by present modal segue, the viewcontroller is active, so it crash:

Use this after call segue from mainVC or something u wanted to go back:

[self dismissViewControllerAnimated:NO completion:nil]

or

[[self presentingViewController] dismissViewControllerAnimated:NO completion:nil]

or use push segue, it auto add a back button that automatically add back function