ios - Navigation controller back button when getting back from Facebook share -

i'm using facebook share dialog when sharing content app.

i'm presenting content going share on marypopin controller , works perfect except navigation controller. adds "back button" when getting facebook.

any ideas why happening?

you're using navigation controller, adds "back" (or custom text) button default navigation bar.

if want hide button (not remove or replace it), in viewdidload add line of code:

obj-c:

self.navigationitem.hidesbackbutton = yes; 

swift:

self.navigationitem.sethidesbackbutton(true, animated:true);