"Back" button not displaying in navigationItem

I came across a very subtle issue.

Usually things are okay, but occasionally the current UIviewController has no title. When I call another viewcontroller called via

[[fruitDB navigationController] pushViewController:fruitc animated:YES];

there is no "back" button. The area on the top left of the navigation bar is still active though and I can go back.

How can I mak开发者_StackOverflowe sure the back button is still active, even if there is no title?

you can set the backBarButtonItem of the navigation item of the view controller.

Specifically, somewhere in viewController1 before pushing viewController2, do the following...

self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:nil action:nil] autorelease];

When you push viewController2, the back button shown will be the backBarButtonItem of viewController1.

Note: Technically, apple recommends overriding the navigationItem method in your view controller, and adding buttons there, but it's really not an issue in your case.

Just before you push the next view controller why don't you try: self.title = @"Back";??