UIViewController category for creating a custom back button

UIViewController+CustomBackButton

- (UIBarButtonItem *)customBackButton
{
    return [self customBackButtonWithTitle:nil];
}

- (UIBarButtonItem *)customBackButtonWithTitle:(NSString *)title
{
    // if we have no title, search at the current navigation controller stack for the previous title
    if (!title) {
        id aViewController = nil;
        for (int i = 0; i < self.navigationController.viewControllers.count; i++) {
            aViewController = self.navigationController.viewControllers[i];
            if ([self isMemberOfClass:[aViewController class]]) {
                // no checking if you are calling this from rootViewController :)
                id previousViewController = self.navigationController.viewControllers[i-1];
                title = [previousViewController valueForKey:@"title"];
                break;
            }
        }
    }
    
    self.navigationItem.hidesBackButton = YES;
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [backButton setFrame:CGRectMake(0, 0, 47, 29)];
    [backButton setBackgroundImage:[UIImage imageNamed:@"backBTN_bg.png"] forState:UIControlStateNormal];
    [backButton setTitle:title forState:UIControlStateNormal];
    [backButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 5, 0, 0)];
    backButton.titleLabel.font = [UIFont boldSystemFontOfSize:10];
    [backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(backButtonTapped) forControlEvents:UIControlEventTouchUpInside];
    
    return [[UIBarButtonItem alloc] initWithCustomView:backButton];
}

- (void)backButtonTapped
{
    [self.navigationController popViewControllerAnimated:YES];
}