change the title of a backButtonItem in swift

Question

I´m just a beginner in Swift and i don´t get it. Why doesn't change the title of my backBarButtonItem after the push segue?

I tried it with this code in the viewDidLoad:

navigationItem.backBarButtonItem?.title = "Back"

Can somebody help me?

codester · Answer 1 · 2014-09-17T17:08:26.207

1

Use ! not ?. ! is used for getting value from optional or unwrapping the optional

 self.navigationItem.backBarButtonItem!.title = "Back"

edited Sep 17 '14 at 17:08

answered Sep 17 '14 at 17:00

codester

Then, the app will crash... Unfortunately – Tom Kuschka Sep 17 '14 at 17:22
The Debugger says: fatal error: unexpectedly found nil while unwrapping an Optional value – Tom Kuschka Sep 17 '14 at 17:46

1 Answers1