NavigationBar bar button customView doesn't work properly.

[MrFuFuFu]

For the first time it works when the view controller is opened. See the below screenshot, There is a NavigationController embed in.

After I click a subpage, which is under the NavigationController and then swipe back to the current page. It doesn't work correctly. After I performSegue and swipe back to the current page. Here is another screenshot,

Could you take a look please?