iOS导航条从无到有切换问题

- (void)viewWillAppear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES animated:YES];
    [super viewWillAppear:animated];
}

-(void)viewWillDisappear:(BOOL)animated{

    [self.navigationController setNavigationBarHidden:NO animated:YES];
    [super viewWillDisappear:animated];
}

这样写有个问题，如果首页没有导航条，下一页有，切换tabbar的时候，这一页会有隐藏导航条的动画
所以

- (void)viewWillAppear:(BOOL)animated
{
    
    [super viewWillAppear:animated];
    if (self.tabBarController.selectedIndex != 0) {
        [self.navigationController setNavigationBarHidden:YES animated:NO];
    }else{
        [self.navigationController setNavigationBarHidden:YES animated:YES];
    }
}

-(void)viewWillDisappear:(BOOL)animated
{
    
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:YES];
}

应该加个判断