导航栏中的更新后退按钮

Question

if i change the title of the parentViewController, how do i update the back button displayed in the upper left corner of the child view. ?

i already know to set self.title when i am actually displaying the parent view, but i would like to know how to refresh the button with the new title displayed in the child view while i am looking at the child view. i have tried

self.parentViewController.title = @"foo"

and

self.parentViewController.navigationItem.title = @"foo"

Answer 1

尝试这个：

self.parentViewController.navigationItem.backBarButtonItem.title = @"foo";

Answer 2

You need to set the title for the navigationItem that belongs to the 'previous' controller. So in a navigationController that would be the one 'to the left'.

You can set this title first and then push the new view onto the stack.

Answer 3

What I ended up doing was implementing a delegate protocol. my child view tells the parent the new name and the parent sets its title. with self.title = @"foo"