UINavigationController's back button disappears?

Question

I notice something strange happens to one of my view controller: the back button disappears, yet it\'s possible to go back to previous view controller by tapping the top lef

Answer 1

Oh dear. In the implementation of the previous view controller, I accidentally set self.title to @"", which causes this annoying bug.

Remove this line solves the problem.

Answer 2

I had a recursive navigation controller, and this also happened to me, I used this code to fix it:

self.navigationItem.leftItemsSupplementBackButton = true