如何让主界面NavigationBar隐藏,而push到的下一个界面显示NavigationBar?

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];

    [self.navigationController setNavigationBarHidden:NO animated:animated];
}
- (void)viewWillAppear:(BOOL)animated {
    [su