How can I restore the back button functionality in UINavigationController?

Question

I have created my own leftBarButtonItem:

UIBarButtonItem* homeButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks 
                                                                                    target:self 
                                                                                    action:@selector(homeButtonClicked:)];

self.navigationItem.leftBarButtonItem = homeButton;

How can I restore the original back button functionality programmatically?

Answer 1

self.navigationItem.leftBarButtonItem = self.navigationItem.backBarButtonItem;

Answer 2

self.navigationItem.leftBarButtonItem = nil;

This will remove your custom left button, and the back button will appear again.