For example, start with Apple’s NavBar sample. Drop this code into initWithNibName:bundle: in PageThreeViewController.m:

- (id)initWithNibName:(NSString *)nibNameOrNil
               bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    {
        // this will appear as the title in the navigation bar
        CGRect frame = CGRectMake(0, 0, 400, 44);
        UILabel *label = [[UILabel alloc] initWithFrame:frame];
        label.backgroundColor = [UIColor clearColor];
        label.font = [UIFont boldSystemFontOfSize:20.0];
        label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
        label.textAlignment = UITextAlignmentCenter;
        label.textColor = [UIColor yellowColor];
        self.navigationItem.titleView = label;
        label.text = NSLocalizedString(@"PageThreeTitle", @"");
        [label release];
    }

    return self;
}