I have a UICollectionViewController
which acts like a paging, each cell has its own page.
On navigation bar, it always shows "Back".
The following wouldn't change the title.
-(void)viewWillAppear:(BOOL)animated{
UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
initWithTitle: @"Back Button Text"
style: UIBarButtonItemStyleBordered
target: nil action: nil];
[self.navigationItem setBackBarButtonItem: backButton];