ios – 点击手势以隐藏导航栏,标签栏和状态栏

我正在尝试在我的网页视图上实现点按手势以隐藏/显示导航栏,标签栏和状态栏.我隐藏/显示导航栏工作正常,我可以隐藏状态栏但不能让它显示备份.标签栏项目被隐藏但条形图仍然存在.有人能帮忙吗？

- (void)toggleBars:(UITapGestureRecognizer *)gesture
{   
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
    BOOL statusBarHidden = YES;

    BOOL barsHidden = self.navigationController.navigationBar.hidden;
    [self.navigationController setNavigationBarHidden:!barsHidden animated:YES];

    BOOL tabBarHidden = self.tabBarController.tabBar.hidden;
    [self.tabBarController.tabBar setHidden:!tabBarHidden];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    UIBarButtonItem *systemAction = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@SELEctor(showMenu)];
    self.navigationItem.rightBarButtonItem = systemAction;

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@SELEctor(toggleBars:)];
    [webView addGestureRecognizer:singleTap];
    singleTap.delegate = self;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

编辑：看起来标签栏正在隐藏,但我的webview只是没有填充空白区域.隐藏标签栏时如何填充空间？

[[UIApplication sharedApplication] setStatusBarHidden:![[UIApplication sharedApplication] isStatusBarHidden] withAnimation:UIStatusBarAnimationSlide];

[self.navigationController setNavigationBarHidden:!self.navigationController.navigationBar.hidden animated:YES];